广西钦州茅尾海游泳动物种群结构调查与分析

Species composition and resource density of necton in Qinzhou Maowei Gulf of Guangxi

根据2011年广西钦州茅尾海丰水期和枯水期2次渔业资源调查的资料,分析了该海域游泳动物的种类组成及其资源密度的分布。结果表明,该水域共有游泳动物113种,分隶于19目54科86属,其中鱼类76种,占总种数的67.26%,分隶于13目39科65属。甲壳类29种,占总种数的25.66%,隶属于2目10科15属。头足类7种,占总种数的6.20%,隶属于3目4科5属。肢口类1种,占总种数的0.88%,分隶于1目1科1属。游泳动物大多属于印度-太平洋区系,鱼类全都是硬骨鱼类,以暧水性种类为主(88.16%),暧温性种类少(11.84%),没有出现冷水性种类。甲壳类和头足类以暧水性种类为绝对优势,广温性种类相对较少,没有出现冷水性种类。游泳动物资源密度呈现明显的季节变动,质量密度枯水期(25 977.37 kg·km-3)明显高于丰水期(15 249.49 kg·km-3),而个体密度丰水期(3 825 446尾·km-3)明显高于枯水期(1 889 575尾·km-3)。

Based on the survey data in Qinzhou Maowei Gulf of Guangxi in wet and dry seasons in 2011, we analyzed the species com- position and resources density of nekton in that area. The results show that there were 113 species of necton belonging to 86 genus, 54 families, 19 orders. Among them, 76 species of fish accounting for 67. 26% of the total species belonged to 65 genus, 39 families, 13 orders. There were 29 species of crustacean accounting for 25.66% of the total species which belonged to 15 genus, I0 families, 2 orders. There were 7 species of cephalopoda accounting for 6. 20% of the total species which belonged to 5 genus, 4 families, 3 or- ders. There was 1 species of merostomata accounting for 0. 88% of the total species which belonged to 1 genus, 1 families, 1 orders. The necton mostly belonged to the fauna of Indian-Pacific. The fish all belonged to osteichtbyes. The dominant fish species were warm- water （88. 16% ）, then warm-temperate （11.84%）, no cold-temperate. The dominant crustacean and cephalopoda species were warm-water, then eurythermal, warm-temperate, no cold-temperate. The resource density of nekton presented obvious seasonal varia- tion, and the weight density was significantly higher in dry season （25 977.37 kg .km-3 ） than that in wet season （ 15 249.49 kg. km-3 ）, but individuality density was significantly higher in wet season （3 825 446 ind.km-3 ） than that in dry season （ 1 889 575 ind.km-3）.