A study on the relationship between the chub mackerel and Japanese scad fishing ground and marine environment in the East China Sea and Yellow Sea

Abstract:

Analysis of correlation between catch distribution of chub mackerel Scomber japonicusand Japanese scad Decapterus maruadsi,and marine environment in the East China Sea and Yellow Sea was done by means of geographical information system and statistical methods,in order to understand the tempo spatial distribution of chub mackerel and Japanese scad in relation to marine environment parameters such as sea surface temperature and salinity from July to November in 2000~2004.The results indicated that high yields (greater than 2 000 tonnages) were mainly obtained between 122~125°E,26~28°N,and 123~125°E,32~38°N,and the catches were larger in the northern fishing ground than those in the southern fishing ground.Moreover,fishing seasons were different in the two fishing grounds.Peak yields occurred in October in the northern fishing ground,while it was August and September in the southern fishing ground,and total catch of the former was 227% more than that in the southern fishing ground.The suitable water temperature and salinity for chub mackerel and Japanese scad were 95~295 ℃ and 309~344,respectively,and the optimum water temperature and salinity were 285~295 ℃ and 32.8-34.2,respectively.Reliability of the result was examined by K-S test.