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Standardized Catch Rates for Blue and Mako Sharks from the U.s. Pelagic Longline Logbook and Observer Programs
| Content Provider | Semantic Scholar |
|---|---|
| Author | Cortés, E. Torrella |
| Copyright Year | 2008 |
| Abstract | SUMMARY Updated indices of abundance were developed for blue shark (Prionace glauca) and mako sharks (Isurus spp.) from two commercial sources, the US pelagic longline logbook program (1986-2007) and the US pelagic longline observer program (1992-2007). Indices were calculated using a two-step delta-lognormal approach that treats the proportion of positive sets and the CPUE of positive catches separately. Standardized indices with 95% confidence intervals are reported. For blue sharks, the logbook time series showed a marked decreasing trend with signs of a potential recent recovery, but the observer time series showed no clear trend. For makos, both the logbook and observer time series showed a concave shape, with essentially no decline since 1992 and an upward trend since the late 1990s. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.iccat.int/Documents/Meetings/Docs/SCRS/SCRS-08-137_Cortes.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |