CRD 08-10

Table 5.  Bycatch rates from the Mid-Coast and Massachusetts Bay Management Areas during the winter (January–May) and fall (September–December) under four different situations.  The highlighted and bold total bycatch rate is the 2-year average bycatch rate weighted by the number of observed hauls. 
A. Data actually observed during 2005 and 2006.
B. Assume year A has a bycatch rate that is two (2) times that observed in 2006.  Bycatch rate in year B is calculated assuming the number of observed hauls (“weighting”) is like that documented in 2006 and there is one observed take. 
C. Assume year A has a bycatch rate that is three (3) times that observed in 2006. Bycatch rate in year B is calculated assuming the number of observed hauls (“weighting”) is like that documented in 2006 and there are no observed takes.
D. Assume year A has a bycatch rate that is three (3) times that observed in 2006. Bycatch rate in year B is calculated assuming the number of observed hauls (“weighting”) is intermediate between that documented in 2005 and 2006 and there is one observed take.
As a reference point, the compliant bycatch rate value for these areas is 0.031.

A. Actual data from 2005 and 2006
Year Observed number
of hauls
Observed harbor
porpoise takes
Bycatch rate:
harbp/mtons landed
2005 821 13 0.129
2006 352 2 0.022
Total 1173 15 0.097
B. Year A: Assume 2 times 2006 bycatch
Year Observed number
of  hauls
Observed harbor
porpoise takes
Bycatch rate:
harbp/mtons landed
A 352 3 0.044
B 352 1 0.014
Total 704 4 0.029
C. Year A: Assume 3 times 2006 bycatch
Year Observed number
of  hauls
Observed harbor
porpoise takes
Bycatch rate:
harbp/mtons landed
A 352 4.5 0.066
B 352 0 0.000
Total 704 4.5 0.033
D. Year A: Assume 3 times 2006 bycatch
Year Observed number
of  hauls
Observed harbor
porpoise takes
Bycatch rate:
harbp/mtons landed
A 352 4.5 0.066
B 600 1 0.008
Total 952 5.5 0.030

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(Modified Jul. 23 2008)