Spatiotemporal patterns of rockfish bycatch in US west coast groundfish fisheries: opportunities for reducing incidental catch of depleted species
2015
Spatial and temporal management measures to reduce nontarget catch are important strategies for rebuilding
overfished
rockfish(
Sebastesspp.) populations in the Northeast Pacific. We describe efforts to support reducing
rockfish
bycatchin central California
trawlfisheries by testing the efficacy of move-on rules on catch data from 2002 to 2010. Move-on rules are regulations or guidelines that trigger the temporary closure of a fishery in a targeted area when a
bycatchthreshold is reached, without the closure of the entire fishery. Move-on rules based on spatiotemporal autocorrelation (clustering) were effective in reducing
bycatchwith modest impact on target catch, removing between 35% and 77% of future hauls with
bycatchwithin a specified distance and time of a
bycatch-containing haul, while foregoing target catch by an average of 12%. The spatial and temporal peak clustering scales show correlation with the level of schooling behavior by each species; however, the efficiency of the rules measured ...
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