Abstract:To protect and enhance the nigorobuna Carassius buergeri grandoculisˆshery, a minimum total length limit of 220 mm (170 mm standard length) was established in Lake Biwa in April 2007. The length composition, age, sex ratio and gonadosomatic index (GSI) of nigorobuna landed by gill-net during February and March from 2006 to 2008 were investigated to evaluate the regulation. The percentage of catches smaller than 170 mm in standard length decreased from 18.9 in 2006 to 2.8 in 2008. The catches were dominated b… Show more
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