Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish(Sebastes spp.)in the offshore Northern shrimp(Pandalus borealis)fishery of eastern Canada  

作　　者：Tomas Araya-Schmidt Shannon M.Bayse Paul D.Winger Colin H.Frank 

机构地区：[1]Centre for Sustainable Aquatic Resources,Fisheries and Marine Institute,Memorial University of Newfoundland,St.John’s,NL,A1C 5R3,Canada

出　　处：《Aquaculture and Fisheries》2023年第6期661-671,共11页渔业学报（英文）

摘　　要：The offshore Northern shrimp(Pandalus borealis)bottom trawl fishery in eastern Canada currently uses 22 and 28 mm bar spacing Nordmøre grids to limit bycatch from using small mesh codends.However,a recent rebound of juvenile redfish(Sebastes spp.),that can pass through the grids,has greatly increased bycatch.To address this concern,this study investigated the effectiveness of 17 and 15 mm bar spacing Nordmøre grids in a twin-trawl(paired)configuration against the traditional 22 mm bar spacing grid.Size selectivity analyses showed that the 17 and 15 mm grids resulted in no significant reduction in shrimp catch across all length classes.The 17 mm grid significantly reduced redfish bycatch for all length classes and the 15 mm grid significantly reduced redfish bycatch for individuals larger than 95 mm total length.Less redfish entered the codend with the experimental grids,however,the overlap in width between redfish and Northern shrimp limits the overall sorting efficiency of the grids,leaving some redfish still vulnerable to capture.

关 键 词：Size selectivity Twin trawling Catch comparison Bycatch reduction device 

分 类 号：S97[农业科学—捕捞与储运]