Macro-level quantification and analysis of schooling behavior of Parargyrops edita Tanaka in Minnan-Taiwan Bank Fishing Ground

According special investigation material of Parargyrops edita population in Minnan-Taiwan bank fishing ground from July 1998 to June 2000, the E value in each month of P. edita population was calculated, which used to quantificationally analyse the variation rule of schooling behavior. The results showed that the annual monthly average E of P. edita population in Minnan-Taiwan bank fishing ground is 7.4409108J, in the reproduction period which from December to March of the next year, the average monthly E is 2.4949108J, which was 0.34 times of the annual average, that meant the fish concentrated; young appeared in large numbers from April to May, and the average monthly E was 4.556108J, which was 0.61 times of the annual average, the fish relatively concentrated; in feeding migratory months from June to August, the average monthly E was 1.3448109J, which was 1.81 times of the annual average, the fish dispersed; E was 1.435109, 9.7409108, 5.769108J from September to November respectively, which was 1.93, 1.31 and 0.78 times of the annual average E; in the transfer process, the fish population gradually concentrated in order to adapt to water temperature and look for spawning grounds. So schooling behavior of the reproductive population of P. edita in Minnan-Taiwan bank fishing ground was the strongest, followed by a young group and the group which need adapt to the water temperature and search for spawning grounds, while the feeding group disperse.