红水河四大家鱼资源现状调查分析

发布时间：2018-06-28 04:53

  本文选题：四大家鱼 + 资源调查　； 参考：《南方农业学报》2016年01期

【摘要】：【目的】调查评估红水河四大家鱼资源现状,为其渔业资源可持续开发利用提供参考依据。【方法】在红水河干流设置天峨、东兰、大化、都安及来宾5个监测站位,按季度现场采样和固定渔船捕捞记录,调查红水河四大家鱼占渔获物比例、种群结构特征及其繁殖生物学特性。【结果】红水河四大家鱼占渔获物比例合计为10.38%,其排序为鳙(3.41%)青鱼(2.94%)鲢(2.93%)草鱼(1.09%)。青鱼体长以400.1~600.0 mm为主(占61.53%),体重以≥1200.1 g为主(占84.62%);年龄由0+~5+共6个年龄组组成,各年龄组百分比相对较接近;草鱼体长以200.1~400.0 mm为主(占72.41%),体重以200.1~700.0 g居多(占55.17%),年龄以0+龄和1+龄居多,分别占草鱼总数的48.3%和34.5%;鲢体长以200.1~600.0 mm为主(占96.55%),体重以≥1200.0 g居多(占48.28%),年龄以1+龄最多,占鲢总数的55.2%;鳙体长以200.1~400.0 mm为主(占52.94%),体重以200.1~700.0 g为主(占55.56%),年龄以0+龄最多,占鳙总数的59.3%。四大家鱼的亲鱼比例为38.9∶27.8∶27.8∶5.5,其性比(雌∶雄)分别为:青鱼42.9∶57.1、草鱼55.0∶45.0、鲢62.5∶37.5、鳙50.0∶50.0,均接近于l∶l;相对繁殖力均值为青鱼11.85~17.63粒/g、草鱼32.33~43.48粒/g、鲢10.48~16.70粒/g、鳙5.93粒/g。【结论】红水河四大家鱼资源量呈下降趋势,草鱼、鲢、鳙捕捞压力过大,其种群呈小型化和低龄化;四大家鱼的个体繁殖力偏低,其群体自我补充能力基本丧失。
[Abstract]:[objective] to investigate and evaluate the present situation of four domestic fish resources in Hongshui River, and to provide reference for the sustainable exploitation and utilization of fishery resources. [methods] five monitoring stations of Tianao, Donglan, Dahua, Duan and Gui were set up in the main stream of Hongshui River. Sampling and fixing fishing records on a quarterly basis to investigate the proportion of the four largest fish catches in the Red Water River. [results] the total proportion of the four domestic fishes in the catch was 10.38. The order was bighead carp (3.41%), herring fish (2.94%), silver carp (2.93%) and grass carp (1.09%). The main body length of herring is 400.1 (61.53%), the body weight is more than 1200.1 g (84.62%), the age is composed of 6 age groups, the percentage of each age group is relatively close. The main body length of grass carp was 200.1f.400.0 mm (72.41%), the body weight of grass carp was 200.1f.700.0 g (55.17%), the majority of them were 0 and 1 years old, which accounted for 48.3% and 34.5mm of the total number of grass carp respectively, 200.1600.0 mm (96.55%), the weight 鈮，

本文编号：2076816