白斑狗鱼与黑斑狗鱼生长特性的比较研究

The Comparative Studies on the Growth Characteristics of Esox lucius Linnaeus and Esox reichrti Dyhowsk

对额尔齐斯河白斑狗鱼和黑龙江黑斑狗鱼的种群结构和生长特性进行比较研究。结果表明,白斑狗鱼由10个年龄组组成,体长与体重的关系式为W=2×10-5L2.9006,生长方程为Lt=1085.49(1-e-0.1372(t+0.60387)),Wt=12658.26(1-e-0.1372(t+0.60387))3,生长拐点为7.42龄,拐点体重为3750.60g,其在8龄前能维持较快速的生长;黑斑狗鱼由7个年龄组组成,体长与体重的关系式分别为W=4×10-6L3.1367,生长方程为Lt=1588(1-e-0.1119(t+0.46587)),Wt=43870.1(1-e-0.111(9t+0.46587))3,生长拐点为9.35龄,拐点体重为12998.55g,其在10龄前能维持较快速的生长:同时探讨2种狗鱼生态学参数的地理差异。鉴于2种狗鱼的资源现状,建议应加强对4+～7+龄个体的保护。

The population structure and growth characteristics of Esox lucius Linnaeus from Ertixhe River and E.reichrti Dyhowsk from Heilongjiang Rive were studied.The results showed that the population of E.lucius had a relatively complex age structure which contained 10 age classes ranging from 1＋ to 9＋ and 11＋.The relationship of length-weight was W=2×10-5L2.9006,and the growth equation of body length and body weight were Lt = 1085.49（1-e-0.137（2t＋0.60387））and Wt = 12658.26（1-e-0.137（2t＋0.60387））3,respectively.The body weight growth inflexion point was 7.42,with the corresponding body weight of 3750.60g,which indicated fast growth period of E.lucius occurred at the early eight years old.The age structure of E.reichrti Dyhowsk population contained seven age classes.The relationship of length-weight was W=4×10-6L3.1367,and the growth equation of body length and body weight were Lt = 1588（1-e-0.111（9t＋0.46587））and Wt = 43870.1（1-e-0.111（9t＋0.46587））3,respectively.The body weight growth inflexion point was 9.35,with the corresponding body weight of 12998.55g,which indicated fast growth period of E.reichrti Dyhowsk occurred at the early ten years old.The geographical difference of ecological parameters from two kinds of Esox was also discussed.Results suggested fishes at 4＋～7＋ should be protected respecting the resource situation of E.lucius and E.reichrti Dyhowsk.