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UNITED STATES DEPARTMENT OF COMMERCE

National Oceanic and Atmospheric Administration National Marine Fisheries Service

166 Water Street Woods Hole, MA 02543

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December 15, 2000


CRUISE RESULTS


NOAA Fisheries Research Vessel DELAWARE II

Cruise DE 00-08 (Parts I – IV)


Atlantic Herring Hydroacoustic Survey CRUISE PERIOD AND AREA

The 2000 Fall Herring Acoustic Survey was conducted in four parts between September 5 and October 11, 2000. Areas of operation were the continental shelf (depths to 300m) in the Gulf of Maine and Georges Bank regions, including the Canadian Exclusive Economic Zone on eastern Georges Bank. The FRV Delaware II spent the first day conducting acoustic calibrations dockside in Woods Hole. Shakedown and survey operations during Part I were conducted in the Jeffreys Ledge area during September 6 - 9 (Fig. 1). An overnight portcall in Portland, Maine was made during September 9 - 10 to exchange scientific staff. Survey operations continued during Part II on September 10 - 16 on offshore banks in the Gulf of Maine and northern Georges bank regions (Fig. 1). During part III, the systematic survey along the northern flank of Georges Bank was repeated using different survey designs on September 18 - 29 (Fig. 2). During Part IV, the systematic survey along northern Georges Bank was replicated two additional times on October 3 - 11 (Fig. 3). The FRV Delaware departed a day later and arrived two days early than the original Part IV schedule due to adverse weather conditions.


OBJECTIVES


Cruise objectives were to (1) shakedown instrumentation and gear, including EK500 echosounder calibrations, (2) conduct acoustic surveys of Atlantic herring (Clupea harengus) stocks in the Gulf of Maine and Georges Bank regions to provide fisheries independent abundance estimates, (3) ground-truth species-specific acoustic estimates using mid-water trawls and underwater video, (4) conduct an acoustic survey design experiment, (5) conduct an in-situ multi-frequency target strength (TS) experiment on herring, and (6) test and evaluate advanced technologies (broad-band acoustics) for improving fisheries acoustics estimates.


METHODS


Standardized NEFSC Fisheries Acoustics Survey Operations:


Fall fisheries acoustic surveys are conducted annually by the Northeast Fisheries Science Center (NEFSC) with the primary goal of estimating the abundance and biomass of selected spawning stocks of Atlantic herring in the Gulf of Maine and Georges Bank regions. Standardized NEFSC procedures for fisheries acoustic survey operations were implemented during the Fall 2000 Herring Acoustic Survey. The first day was devoted to EK500 calibrations, and the transceiver test menu was routinely checked before, during, and after each cruise to ensure the EK500 system was operating properly during survey operations. After EK500 calibrations were completed, systematic surveys along predetermined transects were conducted on selected offshore banks in the Gulf of Maine and Georges Bank regions.


Survey operations included continuous data collection along a series of systematic transects using the EK500 echo-integration, omni-directional sonar, and Scientific Computer System (SCS) throughout the cruise track and during gear deployments. Systematic surveys were conducted on historical spawning grounds of Atlantic herring in the Gulf of Maine and Georges Bank regions Midwater trawling, underwater video, and CTD deployments were routinely conducted to identify acoustic backscatter and obtain biological and oceanographic data. Biological and oceanographic samples were collected and processed according to standard NEFSC procedures. EK500 acoustic data were routinely processed at sea using the BI500 post-processor. Continuous and deployment data are linked and managed using the SCS Event Logger program throughout the cruise. If time permits, in-situ acoustic experiments are typically conducted to investigate the variability of the acoustic measurements in an effort to improve our population estimates. During this year’s survey, the northern Georges Bank region was surveyed several times using various survey designs to determine the optimum design to adopt for future NEFSC fisheries acoustic surveys.


EK500 Calibration:


The multifrequency Simrad EK500 (v.5.30) Scientific Sounder system is the primary instrumentation used to estimate the abundance of Atlantic herring and other species of pelagic fish and squid. Calibrations of the EK500 are critical to ensure that the echo- integration system is operating properly and to obtain high precision of acoustic measurements. The FR/V Delaware’s EK500 operates three downward looking hull- mounted transducers (one single-beam transducer operating at 12 kHz, and two split-beam transducers at 38 and 120 kHz). The 38 and 120 kHz split-beam transducers were successfully calibrated using the standard sphere technique. For each frequency, a calibration sphere of known target strength was suspended under each transducer.


Each sphere was moved throughout the beam pattern using four remotely controlled downriggers. Due to windy conditions, calibrations were conducted alongside the Woods hole Oceanographic Institution’s pier rather than in Cape Cod Bay. Gain and angle offset parameters for the 38 and 120 kHz transducers were derived using the Simrad Lobe (v.95-01-17) program, however existing survey parameters for the transducers remained unchanged given the high precision and agreements of the calibration results. The Sv gain for the 120 kHz was modified slightly from last year’s settings based on the calibration tests using the integration tables. The single-beam 12 kHz transducer could not be calibrated, therefore the existing 12 kHz transducer settings were not changed. Ambient noise tests were conducted to ensure there were no cross-interference between acoustical instrumentation, and amplitude measurements from the test menu verified that the EK500 system was working properly. The EK500 operations were synchronized with the external trigger of the omni-directional sonar to eliminate acoustic cross-interference during survey operations.


EK500 Sampling Operations


The EK500 was operated continuously along the cruise tracks and during gear deployments throughout the cruise. EK500 data were collected simultaneously from three frequencies at a ping rate of every 2 seconds. The EK500 echo-integrator vertically integrates volume backscatter (Sv in units of m2/m3) into 0.5 m depth increments. Volume backscatter were converted to cross-sectional backscatter (Sa in units of m2/nm2) as a relative index of abundance along the cruise track. Individual target strength (TS) measurements are also collected by the EK500. The EK500 data were logged to the Simrad BI500 Bergen Integrator (release 1.9.1996) via TCP/IP ETHERNET line. The EK500 received its navigational input from the vessel’s Scientific Computer System (SCS) PCODE output. A SUN Sparc-10 workstation operated the BI500 which logged, processed, and archived EK500 data as binary files into the UNIX- based INGRES relational database. During the cruise, the BI500 post-processor was used to filter unwanted noise and partition acoustic backscatter by species composition.


High Speed Midwater Rope Trawl (HSMRT) Sampling Operations:


The High Speed Midwater Rope Trawl (HSMRT, Gourock design R2028825A) was the main sampling gear used to verify fish backscatter identified by the EK500. The HSMRT is a four seam pelagic trawl designed with 53.1 m headrope, footrope, and breastlines. The HSMRT was rigged to 1.8 m2 double-foiled Suberkrub-type doors with 62.4 m of upper and lower bridles/legs. The optimum tow configuration (2.5 m setback, 227 kg tomweights, intermediate door spread with two shoe weights per door) was implemented during survey operations (refer to Cruise Results DE 98-09 for further details). The mouth opening of the HSMRT is approximately 13 ± 3 m vertical and 27 ± 5 m horizontal. HSMRT deployments were targeted on selected fish backscatter along the cruise track, and HSMRT deployments were generally conducted about once per watch (i.e., every 6 hours). Deployments served to verify species composition comprising acoustic backscatter based on scattering patterns observed in acoustic echograms. Our goal was to deploy the midwater trawl about four times per 24 hour period to provide evenly spaced catch data for each area and selected backscatter layers. The HSMRT was towed at an average speed of 4.5 knots typically for 30 minutes in duration. However, tow duration often varied between 10 to 40 minutes depending on acoustic fish signals observed during the tow. Tow duration is defined as the time between setting the doors and when doors are hauled out of the water. The tow profile of the trawl was typically dropped incrementally through the water column to the desired depth of the scattering layer or about 10 m off the bottom, held at that depth for the duration depending on the fish targets observed by the trawl monitoring system, and then retrieved back to the surface.


Trawl duration, tow depths, and tow speeds were not standardized or consistent between trawls and catch data should not be used for abundance estimates. We are currently utilizing trawl catch information to verify acoustic backscatter, thus the mid- water trawl was often targeted at specific aggregations or layers in the water column. Tow depths were chosen by observing EK500 echograms and bridge real time displays for aggregation and layer depths, and also by incorporating the real time display of the FS900. Typical trawl duration was 30 minutes, however the trawl was often “dipped” into the aggregation for as little as a minute when subsampling large herring aggregations.


Midwater Trawl Monitoring:


Trawl performance was measured with a FS903 system, ITI system, and a pair of Vemco temperature-depth Minilog sensors. The Simrad FS903 Trawl Monitoring System is a third-wire device that provided real-time sonar images of the trawl opening and performance. The FS903 sonar display also showed whether fish were falling into or around the trawl opening, thus allowed the tow duration to be minimized to capture only the necessary amount of herring required for scientific samples. The Simrad ITI wireless trawl sensors were used to obtain point measurements of the trawl depth, wing spread, and door spread. Minilog depth-temperature probes were attached to the trawl headrope and footrope to provide continuous depth-temperature and trawl performance profile data for each deployment.


Biological Sampling:


The catch from each trawl was sorted by species, weighed, and measured (fork length to the nearest cm) according to standard NEFSC procedures. Additional biological sampling for Atlantic herring included individual weights (to nearest 0.1 g), fork lengths (nearest mm), stomach content analyses, and otolith samples for aging.


Furuno CSH-5 Omni-directional Sonar:


A 55-64 kHz Furuno CSH-5 Omni-directional Sonar was used during survey operations for locating fish aggregations and documenting the horizontal spatial patterns of herring schools along the transects. The CSH-5 sonar simultaneously scanned a full 3600 with a cone-shaped receiving beam. Its beam can be tilted at various angles from the surface, and the center of its beam was usually angled 70 from the surface during calm weather. During rough weather, the beam tilt angle was set at 100 to eliminate surface noise. The vertical width of the receiving beam is 150 resulting in a horizontal search radius of 800 m in waters with bottom depths of around 200 m. The search radius on the display was set to 400 m during most of the survey operations. In shallow waters of less than 80 m depth, the search radius was lowered to 250 m. The omni-directional sonar operating at 55-64 kHz was identified as a source of acoustical interference with the EK500 operations during previous cruises, however this problem has been eliminated by wiring the external trigger of the omni-directional sonar to the EK500 to synchronize its ping rate. Analog images from the omni-directional sonar were obtained using a video capture-board every 30 seconds, and the files were merged with the SCS navigational data and archived.


Static Underwater Stereo Video System:


The Static Underwater Stereo Video System (SUSVS) was designed by the NEFSC Fisheries Acoustics Research Group to directly verify acoustic targets within the EK500 beam. The SUSVS was deployed midship from the forward A-frame along-side the acoustic beam of the EK500 while the FRV Delaware drifted over selected backscatter aggregations. A pair of matched underwater video cameras (DSP&L MicroSea B&W 1050) were mounted in the array to obtain stereo imagery of targets. The cameras have a low light (0.05 lux) auto adjusting iris with a 770 horizontal and 590 vertical field of view. A pair of DSP&L SeaLasers 100-15 were mounted in parallel (54 mm off center) for measuring target size. Two DSP&L SeaLites provided illumination that were dimmed remotely using a 120 v voltage regulator. The real-time depth profile, temperature, compass bearing, and three-dimensional orientation of the camera system were recorded every 10 seconds using the JASCO Attitude Sensor. Real-time dual video and environmental data were recorded from the SUSVS through a 300 m multi-conductor cable to a PC computer and SVHS video recorders. Video images were transmitted through a conductor cable via portable winch system to two (one for each camera) video taping machines. Each frame was time-stamped with a time-code generator so that images from each camera can be coordinated with each other and in time. Data from the Jasco sensor were transmitted for real-time monitoring of the towbody and the data were recorded to a PC computer.


Scientific Computer System (SCS):


The FRV Delaware’s Scientific Computer System (SCS) continuously collected navigational, oceanographic, and meteorological data at a rate of every 30 seconds throughout the cruise track. The SCS Event Logger program was used throughout the cruise to develop a detailed Eventlog file of start and end points of times and positions of each transect and deployment. The Eventlog also contains operational and observational comments. The Eventlog was critical for managing and linking our continuous and deployment type data. All computers, instrumentation, acoustic data collection, and data recording were synchronized according to the SCS master clock.


Survey Design Experiment:


An experiment was conducted on northern Georges Bank to examine the variability in the acoustic populations estimates for herring using various survey designs. A stratified evenly spaced transect survey design was conducted during Part II (Fig. 1). An adaptive approach was implemented to ensure that the length of the transects included the herring aggregation (i.e., a transect did not end in an area of high fish concentration). Transects (lengths and distances between transects) were chosen to cover the bathymetric features which delimit each area. Each transect was sequentially numbered and defined as a continuous cruise track with a single heading and constant ship speed. Parallel transects were defined as a series of parallel coordinated vessel tracks within a specified area. Cross-over transects were tracks perpendicular to parallel transects for traveling between parallel transects, and were generally not used for abundance estimates. Midwater trawl and CTD deployments were conducted intermittently along transects to identify acoustic backscatter and oceanographic parameters. Upon completion of a deployment, the previous transect number was resumed if the vessel continued along the track at approximately the same location and heading of the previous transect. If the vessel heading changed or the vessel did not resume near the end of the previous track, the transect number was incremented. Vessel speed during all surveys was designated at 10 knots, while actual survey speeds ranged from 8-12 knots depending on weather conditions and currents.


During Part III, a randomly selected parallel transect design was conducted in the same survey area on northern Georges Bank (Fig. 2). The next survey design implemented was a zig-zag design (Fig 2). A zig-zag design was typically used to survey an elongated area aligned with a shoreline or bathymetric contours. A zig-zag survey consists of a series of coordinated transects where the ending of the previous track and the beginning of the next track occur in the same location and the angle between transects is consistent. An advantage of a zig-zag design is the more efficient cruise track from eliminating cross-over transects, however the nodes where transects intersect must be eliminated from the population estimates.


Acoustic Data Collection and Post-Processing:


The primary acoustic data used for population estimates of Atlantic herring were collected with the Simrad EK500 scientific echosounder (v.5.30) operating three hull mounted transducers (a 12 kHz single-beam and 38 and 120 kHz split-beam transducers). The three frequencies were transmitted simultaneously at a ping rate of one ping per two seconds. EK500 data were simultaneously transmitted to a Sun Sparc 5 workstation and a PC computer for storage and post-processing. EK500 data consist of echogram data (binary files with acoustic signals vertically integrated into 0.5 m bins) and a relational INGRES database. EK500 data were post-processed on the Sun workstation using Simrad’s BI500 (v.1.9.1996) post-processing package during the cruise. Post-processing included removing bottom interference from the water column signal and apportioning acoustic backscatter to species composition. Data for all three frequencies were post-processed and apportioned to herring backscatter while at sea based on midwater trawl catches, target strength distributions, and backscattering patterns of aggregations. The 38 kHz data was the primary data used for post- processing and deriving population estimates, and the 12 and 120 kHz data were post- processed identically for multifrequency analyses. After post-processing the data at sea, the EK500 data (echogram files and the INGRES database) were downloaded to a shore-based computer at NEFSC for archiving upon the completion of each cruise part. These data will be further processed at the laboratory and loaded into the NEFSC Oracle data management system. EK500 data was also logged and post-processed at sea using the SonarData EchoLog and EchoView software packages (v.1.2), and evaluate the future implementation of this new acoustic post-processor.


The EK500 processed each acoustic signal (ping) by correcting for beam pattern effects, calibration constants, and hardware gains, and then vertically integrated the data into 0.5 m bins (echogram data). Each half-meter bin is volume backscatter (sv) with units of m2/m3 and is a quantitative measure of relative density. The minimum volume backscatter threshold of -66 dB (dB = 10 log10(sv)) was used to remove acoustic scattering by non-swimbladdered fish, invertebrates, and zooplankton from the backscatter by swimbladdered fish (e.g., herring). For preliminary data analysis and diagnostics, volume backscatter was vertically integrated from a specified depth below the surface (“bubble layer”) to 0.5 m above the bottom. Data between the surface and the bubble layer were not included in the analysis to eliminate scattering by surface bubbles and noise. The bubble layer was set to 10 m for the 38 and 120 kHz data. The bubble layer was set to 32 m for the 12 kHz data as the upper 32 m of the 12 kHz data have significant noise from the “ring-down” of the transducer. Vertical integration of volume backscatter from the bubble layer to the bottom gives areal density estimates (sa ) with units of m2/m2 for all scatterers in the water column. The BI500 then scales these density estimates from m2/m2 to nautical mile squared (m2/nm2 = sa * 1852 m2/nm2). We calculate sa at 0.5 nautical mile intervals. sa values are an index of relative areal density, and further analysis is required to produce numeric abundance and biomass estimates for a survey area.


Other Data:


Conductivity-temperature-depth (CTD) were conducted throughout the cruise, generally at the transect nodes and locations of gear deployment. During part II of the cruise, Gerald Denny of Scientific Fisheries Incorporated (Anchorage, Alaska), conducted acoustic measurements with a broadband acoustic system. His towbody was suspended from the forward A-frame while the FR/V Delaware was drifting. Acoustic data from the broadband system was collected and analyzed using a Scientific Fisheries software package.


RESULTS


Departure was delayed one day due to northerly winds, therefore EK500 calibrations were conducted dockside along the Woods Hole Oceanographic Institution pier between September 5th at 23:00 and September 6th at 06:00 (all times herein are GMT). The 120 and 38 kHz split-beam transducers were accurately calibrated, but the 12 kHz single-beam transducer could not be calibrated. Transceiver settings for gains and offset parameters remained unchanged from previous surveys except for a slight modification to the Sv gain of the 120 kHz. The FR/V Delaware departed Woods Hole, MA on September 6th at 13:15 to begin Part I of the Fall 2000 Herring Acoustic Survey.


Part I Operations:


Shakedown operations and systematic surveys were conducted in the Gulf of Maine region during Part I (Fig. 1). Midwater trawl and acoustic shakedown operations were completed in the Wilkinson Basin area (around 42045'N 69052'W) between September 6 at 22:34 and September 7 at 03:12. The Jeffreys Ledge survey (transects 1 - 31) was completed between September 7 at 04:53 and September 8 at 12:24. The Platts Bank survey (transects 33 - 43) was completed between September 8 at 14:29 and 23:45.


The last survey to be completed during Part I was Fippennies Ledge (transects 45 - 53) during September 9 at 01:41 - 07:49. The first four midwater trawl deployments (consecutive deployment numbers 1 - 4) were aborted due to harness and cable connection problems of the FS903 trawl monitoring system. A midwater trawl was successfully completed on Jeffreys Ledge (deployment 5) and Platts Bank (deployment 6). Some Atlantic herring were observed on Jeffreys Ledge, while aggregations of herring were not observed in the Platts Bank and Fippennies Ledge regions. An underwater video deployment (deployment 7) on Fippennies Ledge was unsuccessful due to cable wiring problems. The FRV Delaware arrived in Portland, ME on September 9 at 16:00 to exchange scientific staff.


Part II Operations:


Part II began when the FRV Delaware departed Portland, ME on September 10th at 14:00. Cashes Ledge was surveyed (transects 54 - 70) from September 10 at 22:51 to September 11 at 10:06. Midwater trawl deployment 8 on Cashes Ledge captured mostly silver hake. Some potential herring backscatter was observed on Cashes Ledge. Trawl deployment 9 was aborted due to FS903 disconnection, and trawl deployment 10 was a test tow to ensure the FS903 was operational. The Cashes Ledge survey (transects 54 - 70) was completed on September 11 at 10:07. The first systematic survey of evenly spaced parallel transects along the northern flank of Georges Bank began on September 11 at 23:19. EK500 settings were changed from a depth range of 250 m to 500 m with 1.0 m resolution. Trawl deployment 12 captured mainly silver hake and juvenile butterfish, while trawl deployment 11 was aborted due to the FS903 connection problems. The vessel intermittently stopped and drifted on aggregations of herring to collect acoustic target strength measurements with the EK500 (deployments 13, 20, 25, 29, and 33) and broadband acoustic measurements (deployments 14, 21, 26, and 30). An underwater video (deployment 15) was attempted, but aborted due to pigtail wiring problems. Conductivity-Temperature-Depth (CTD) profiles (deployments 16, 19, 22, 23, 27, and 31) were conducted at the end of selected transects and deployment sites. Midwater trawling (deployments 17, 18, 24, 28, 32, 34) confirmed that Atlantic herring was the predominant pelagic fish species in the Georges Bank survey area. The first evenly spaced parallel transect survey (transects 72 - 105) was completed on September 16 at 04:28 ending Part II.


Part III Operations:


Part III began upon departing Woods Hole, MA on September 18, and the second survey on Georges Bank using a random stratified parallel design began on September 19 at 03:06. During this survey, 33 CTD profiles (deployments 37-37, 39, 40, 42, 44-47, 49-53, 55, 56, 59-61, 63-67, 69-70, 72-74, 76-79) and 12 midwater trawls (deployments 38, 41, 43, 46, 48, 54, 57, 58, 62, 68, 71, 75) were successfully completed. The random stratified parallel survey (transects 106 - 132) was completed on September 24 at 00:16. The FRV Delaware began a zig-zag transect survey (transects 133 - 155) on September 24 at 00:50. The zig-zag survey design was completed on September 29 at 03:31.


Part IV Operations:


The FRV Delaware departed Woods Hole on October 3 to begin part IV. A systematic survey of evenly spaced parallel transects (transects 156 - 168) was repeated beginning on October 4 at 02:21 to compare intra-variability within the evenly spaced parallel transect survey design. This second survey using the evenly spaced parallel design was completed on October 6 at 17:02, and a third replicate survey (transects 169 - 181) using the same design began at 17:08. The third survey using the evenly spaced parallel transects ended on October 8 at 20:59. We began a series of night/day comparisons along an experimental transect (184 - 187) on northern Georges Bank on September 9 at 02:47. Operations were curtailed for about 20 m hours due to rough seas exceeding 2 m. The night/day comparisons (188-189) resumed on October 10 at 14:45. Rough seas once again stopped acoustic operations on October 11 at 00:40, and the FRV Delaware slowly (5 kts) worked towards Woods Hole by conducting the final transects (190 - 191) along the 150 m contour of northern Georges Bank. The FRV Delaware arrived in Woods Hole on October 11 at 22:00, approximately 1½ days earlier than originally scheduled.


In summary, the Fall 2000 Herring Acoustic Survey successfully completed the primary objectives. Approximately 4,876 nautical miles of acoustic transects were completed in the Gulf of Maine and Georges Bank regions. Preliminary abundance estimates indicate a large biomass of herring were present along northern Georges Bank throughout the cruise period, while a relatively low biomass of herring were observed in the Gulf of Maine along our cruise track. A total of 164 gear deployments were conducted throughout the cruise, with 49 midwater trawl deployments (Table 1). The predominant pelagic fish captured was Atlantic herring, particularly in the northern Georges Bank region. Additional effort was made this year to collect salinity- temperature-depth profiles with 103 CTD deployments. More routine CTD deployments will be implemented during future acoustic surveys to investigate interannual variability in the density distributions of herring and other pelagic fish and squid in relation to environmental anomalies. Underwater video operations were unsuccessful this year due to cable/pig-tail wiring problems resulting from modifications of the platform to meet multiple objectives. The main problem occurred from a Pan-tilt AC and JASCO Attitude Sensor DC ground sharing the same conductor which caused NEMA and video interference. This wiring problem will be resolved in time for the next cruise by adopting a universal pigtail that can be used for fisheries acoustic, habitat assessment, and gear selectivity operations. There was excellent progress with experimental work with broadband acoustics during the second leg. Broadband acoustical data was collected on a variety of aggregations, including Atlantic herring. Broadband acoustics is an advanced technology under development which has the potential for increased capability to classify species-specific backscatter.


Considerable effort was devoted this year to repeating the northern Georges Bank survey using various survey designs (i.e., stratified evenly spaced parallel transects, randomly selected parallel transects, and zig-zag transects) in an effort to determine an optimal design. Preliminary results suggested that the random selected transect design had less variability than the other designs. The evenly spaced design was also repeated three times to investigate the intra-variability with a given design. The successful completion of this survey design experiment will help to provide us with confidence intervals on our future acoustic population estimates.


DISPOSITION OF DATA


All data and results are archived at the Northeast Fisheries Science Center. Results will be presented and data distribution on CD-ROM at an annual Northwest Atlantic Herring Acoustic Workshop in conjunction with scientists from the Canadian Department of Fisheries and Oceans.


SCIENTIFIC PERSONNEL


National Marine Fisheries Service, NEFSC, Woods Hole, MA


William Michaels

Chief Scientist

Parts I, IV

Michael Jech

Research Fisheries Biologist

Parts I, II, III, IV

(Chief Scientist - II, III)

William Overholtz

Research Fisheries Biologist

Part III

Amy Williams

Research Fisheries Biologist

Part III

Scott Van Sant

Aquarist

Part IV


National Marine Fisheries Service, NEFSC, Narragansett, RI


Bruce Burns

Fisheries Biologist

Part IV


PTSI Contractors, NEFSC, Woods Hole, MA


Kara Dwyer

Bioacoustical Technician

Parts I, II, III, IV

Peter Chase

Bioacoustical Technician

Parts I, II, III, IV

Toni Chute

Biological Technician

Part II


Woods Hole Oceanographic Institution, Woods Hole, MA


Benjamin Reeder

Acoustical Engineer

Part II


Scientific Fisheries Incorporated, Anchorage, AK


Gerald Denny

Acoustical Engineer

Part II


Cornell University, Ithaca, NY


Matt Beaton

Student Volunteer

Part III

Anna Sellars

Student Volunteer

Part IV

John Hone

Student Volunteer

Part IV


Worcester Polytechnical Institute, Worcester, MA


Patrick Sullivan

Statistician

Part III


Boston University Marine Program, Boston, MA


Elise Watson

Student Volunteer

Part III

Michael Levine

Student Volunteer

Part II


Virginia Institute of Marine Science, Williamsburg, VA


Daniel Doolittle

Student Volunteer

Part II



Part I September 5-9, 2000

Part II September 10-16, 2000

Part III September 18-29, 2000

Part IV October 3-11, 2000



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For further information contact: William Michaels at the National Marine Fisheries Service,

Northeast Fisheries Service Center, Woods Hole, Massachusetts 02543-1097.

Telephone (508) 495-2000, Fax (508) 495-2258

Email: William.Michaels@noaa.gov

****************************************************************************************************


Cruise Track for DE200008 Parts I and II


Figure 1. Cruise track for Parts I and II of the Fall 2000 Atlantic Herring Hydroacoustic Survey cruise DE 00-08 during September 5 - 16, 2000.


Cruise Track Image for DE200008 Part III


Figure 2. Cruise track for Part III of the Fall 2000 Atlantic Herring Hydroacoustic Survey cruise DE 00-08 during September 18 - 29, 2000.


Cruise Track Image for DE200008 Part IV


Figure 3. Cruise track for Part IV of the Fall 2000 Atlantic Herring Hydroacoustic Survey cruise DE 00-08 during October 3 - 11, 2000.



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