| Fish and invertebrate bycatch estimates for the California set gillnet fishery targeting halibut and white seabass, 1990-2006 - :4488 | National Marine Fisheries Service (NMFS)
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Fish and invertebrate bycatch estimates for the California set gillnet fishery targeting halibut and white seabass, 1990-2006
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    "Total fish and invertebrate bycatch is estimated for the California set gillnet fishery that currently targets California halibut (Paralichthys californicus) and white seabass (Atractoscion nobilis). This fishery has had an intermittent observer program from 1990 through 2006 to document catch and bycatch, yet only limited bycatch reporting exists for this fishery from logbook data, which are likely to be negatively biased due to underreporting or non-reporting of bycatch. Using eight years of observer data between 1990 and 2006 covering 8,958 sets in 2,981 vessel trips, the first systematic estimates of fish and invertebrate bycatch (defined as at-sea discards) for 164 species and 17 unidentified taxa are estimated in this fishery using ratio estimators. The most frequently discarded species were spider crabs (Loxorhynchus spp.) and bat rays ( Myliobatis californica). Several prohibited species we reobserved as bycatch including one white shark (Carcharodon carcharias), one basking shark (Cetorhinus maximus), and 35 giant sea bass (Stereolepis gigas). No giant sea bass were observed discarded after regulations caused the fishery to move further offshore in 1994"--Abstract.

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