福建东山湾渔业资源现状调查研究

根据2012—2013年在东山湾海域进行的4个季度航次的渔业资源调查资料,对该海域鱼卵、仔稚鱼及游泳动物组成特征进行了初步研究。结果表明,4个季度航次调查共鉴定出鱼卵15种,仔稚鱼8种(含5个未定种),鱼卵平均密度为2.63个/m3,仔稚鱼平均密度为0.50ind/m3。共出现游泳动物269种,其中鱼类种类数最多,为202种;从季节分布来看,夏季游泳动物种类数最多(161种),冬季最少(62种);从平面分布来看,夏季5号调查站位游泳动物种类数最多(95种),9号调查站位最少(12种)。本次调查,游泳动物重量资源密度平均值冬季最高(1 246.98 kg/km2),春季最低(372.68 kg/km2),尾数资源密度平均值春季最高(36.04×103ind/km2),冬季最低(11.25×103ind/km2);4个季度月优势种均不同,表现出明显的季节更替现象;全年游泳动物重量密度多样性指数表现为秋季夏季春季冬季,丰富度指数d均值为3.49,均匀度指数J'均值为0.64,单纯度指数C均值为0.23;全年游泳动物尾数密度多样性指数表现为夏季冬季春季秋季,丰富度指数d均值为7.09,均匀度指数J'均值为0.70,单纯度指数C均值为0.18。与历史资料相比,本次调查鱼卵仔稚鱼密度四季均值较高,游泳动物种类数较多、重量和尾数密度四季均值较大、物种多样性较高。

Survey on status of fishery resources of Dongshan Bay in Fujian

Based on the fishery data of four oceanographic censuses in the Dongshan Bay from 2012 to 2013 , the composition characteristics of fish eggs, larvae and juveniles, nekton were preliminarily analyzed. Results indicated that 15 species of fish eggs, 8 species of larvae and juveniles were identified, including 5 indeter-minate species of larvae and juveniles. For fish eggs, larvae and juveniles, the average densities were 2. 63 ind/m3 and 0. 50 ind/m3. 269 nekton species were recorded, including 202 fishes, which was the largest populations in number. In seasonal distribution, nekton species was the most ( 161 ) in summer, while the least (62) in winter. From the plane distribution, the most species (95) was in no. fifth station and the least species (12) was in no. ninth station in summer. For mean weight density of nekton, the greatest was 1 246. 98 kg/km2 in winter and the minimal was 372. 68 kg/km2 in spring. While for mean individual density of nekton, the highest was 36. 04 × 103 ind/km2 and the lowest was 11. 25 × 103 ind/km2. Dominant species of four seasons varied, which showed the obvious phenomenon. For nekton’s weight density, the order of diver-sity index was autumn>summer>spring>winter, species richness index d, evenness index J’ and pure in-dex C were 3. 49, 0. 64 and 0. 23. For nekton's individual density, the order of diversity index was summer>spring>autumn >winter, species richness d, evenness index J’ and pure index C were 7. 09, 0. 70 and 0. 18, separately. Compared with the historical data, the mean densities of fish eggs, larvae and juveniles, nekton were higher, and the species and species diversity of nekton were rising in this investigation.