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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 |