论文部分内容阅读
根据不同时期在北部湾进行的渔业资源调查资料,对北部湾二长棘鲷群体的资源状况进行了综合分析。结果表明,该资源年间数量变动明显,平均渔获率最高为35.8kg·h-1(2000),最低为2.73kg·h-1(1992),其数量变动机制是生长、死亡和补充因素综合决定的。二长棘鲷渔获率的季节分布主要是由洄游引起的,目前以3~5月的渔获率最高。北部湾二长棘鲷的高渔获率主要出现在30~60m水深,尤以30~40m水深海域最高。近年来该资源有所恢复,但渔获组成主要以当年生幼鱼和低龄鱼群体组成。并探讨了资源分布与数量变动以及养护资源的措施。
According to the data of fishery resources survey conducted in Beibu Gulf in different periods, the resource status of two populations of Cynodon dactylis in the Beibu Bay were comprehensively analyzed. The results showed that the amount of resources varied significantly during the year, with the highest average catch rate of 35.8 kg · h-1 (2000) and the lowest of 2.73 kg · h-1 (1992). The quantitative change mechanism was the combination of growth, death and supplement factors decided. The seasonal distribution of catches of two long-bream sea breams is mainly caused by migratory migration. At present, the catch rate from March to May is the highest. The high catches of Beech breams in Beibu Bay mainly occur in the depth of 30-60 m, especially in the waters of 30-40 m. In recent years, the resources have been restored, but the catches are mainly composed of current juveniles and young fish groups. And explored resource distribution and quantitative changes as well as measures to conserve resources.