. The Canadian field-naturalist. Natural history. 78 80 82 84 86 88 90 92 94 96 98 00 Year Atlantic wolffish, mean CPUE +/- std err I I z 14 10. 78 79 80 81 82 83 84 85 86 87 88 Year 90 91 92 93 Figure 1. Top — Bars: CPUE ( in each year) for Atlantic Wolffish, Anarhichas lupus, caught in tows within appropriate depth and temperature ranges, 1978-93; Line, X's — same, all stations (data provid- ed by DFO in September 2000). Bottom — mean CPUE ± standard error for all positive tows. Eastern Newfoundland, 1978-1993, DFO Fall Survey Data. square nautical miles and there are on average two t
. The Canadian field-naturalist. Natural history. 78 80 82 84 86 88 90 92 94 96 98 00 Year Atlantic wolffish, mean CPUE +/- std err I I z 14 10. 78 79 80 81 82 83 84 85 86 87 88 Year 90 91 92 93 Figure 1. Top — Bars: CPUE ( in each year) for Atlantic Wolffish, Anarhichas lupus, caught in tows within appropriate depth and temperature ranges, 1978-93; Line, X's — same, all stations (data provid- ed by DFO in September 2000). Bottom — mean CPUE ± standard error for all positive tows. Eastern Newfoundland, 1978-1993, DFO Fall Survey Data. square nautical miles and there are on average two trawls per stratum, the scale-up is prodigious (Schneider et al. 1999). The summed estimates from STRAP analysis results for Atlantic Wolffish in all Canadian waters across the period 1978 to 1999 are shown in Figure 2. Because the sampling protocol changed in 1995, values from Newfoundland areas after 1994 are divided by a correction factor for comparability. For demersal species like wolffish, that factor ranges in general from for adults to for juveniles (Bundy et al. 2000). Calculated for the Atlantic Wolffish alone using Bundy et al.'s (2000) formula, the factor is The STRAP results also indicate a large decline in the wolffish population, down 87% over the 16 years from 1978 to 1994 (about two wolffish generations, and with no change in sampling protocol). From 1978 to 1999 (a little less than three wolffish generations 1995-1999 Newfoundland catches adjusted by ), the decline indicated is 83%. Despite the debatable value of strap's absolute numbers, the annual estimates. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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