Analysis of variation in the fishing efficiency (CPUE) of the TV3 930bottom trawl using the alternate hauls method

摘要

In Poland, a statistically significant dependence between variables -- the CPUE of hauls repeated at the same places and times and the CPUE of first (prime) hauls, made with a TV3 930 bottom trawl, using the alternate hauls method, was confirmed. In November 2002 and 2003 the average CPUE (except for sprat Sprattus sprattus) in the southern Baltic Sea was higher in first hauls than in second (repeated) hauls by 39% for cod Gadus morhua, 50% -- herring Clupea harengus, 17% -- flounder Platichthys flesus, 59% -- other species and 28% -- all species.