Age and growth of Spualiobarbus curriculus from Zhaoqing Guangdong Section of Xijiang River
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摘要:
于2006年5月~6月和2008年5月在珠江的干流西江广东肇庆段采用刺网捕捞赤眼鳟(Spualiobarbus curriculus)标本296尾。采集赤眼鳟的鳞片材料进行年轮特征观察研究,并对赤眼鳟的生长情况进行分析。结果表明,渔获中3龄、4龄赤眼鳟占优势。3龄前体长的相对增长率较大,3龄以后生长缓慢。赤眼鳟体质量生长曲线拐点为8龄,应属衰老拐点。总死亡系数Z=0.337 9,自然死亡系数M=0.193 6,捕捞死亡系数F=0.144 3,开发率为E=0.427。为确保资源的可持续利用,可允许捕捞体长应不小于230 mm,体质量不小于220 g。
Abstract:In base of the 296 specimens of Squaliobarbus curriculus captured by gill-net in the Zhaoqing Guangdong section of Xijiang River during May~June, 2006 and May, 2008, we observed the annual rings on scales of S.curriculus and studied the growth of the fish.The results reveal that the individual catches of age 3 and age 4 are dominant.The relative growth rate of length is greater before age 3 and then decreases.The inflexion point of weight growth curve is aging inflection point at age 8.The total mortality coefficient Z is 0.337 9; the natural mortality coefficient M is 0.193 6; the fishing mortality coefficient F is 0.144 3; the fishing mortality rate E is 0.427.To protect the fishery resources, the capture specifications of length should not be less than 230 mm and the weight should not be less than 220 g.
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Keywords:
- Xijiang River /
- Zhaoqing /
- Spualiobarbus curriculus /
- age /
- growth
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表 1 赤眼鳟各年龄生长实测数据
Table 1 Measured values of growth of S.curriculus at different ages
年龄age 标本数number 鳞径/mm radius 体长/mm length 体质量/g weight 幅度margin 均长average length 幅度margin 均长average length 幅度margin 均质量average weight 1(0+) 10 1.55~2.77 2.18 65~128 103.8 4.5~32.0 18.95 2(1+) 32 1.84~5.90 3.83 124~247 176.0 31.4~259.3 103.40 3(2+) 203 3.37~6.82 5.05 163~300 223.7 77.4~541.5 210.88 4(3+) 50 4.84~7.85 6.32 214~360 275.8 179.3~1 093.0 409.30 表 2 赤眼鳟不同生长时期生长指数
Table 2 Growth indices of S.curriculus at different ages
年龄age 平均推算体长/mm average back-calculated length 相对增长率/% relative growth rate 生长指标growth index 平均推算体质量/g average back-calculated weight 相对增重率/% relative weight gain rate 1 105.2 19.74 2 172.2 63.69 50.66 92.56 368.9 3 224.0 30.08 25.33 211.16 128.1 4 276.5 23.44 20.72 406.38 92.5 表 3 赤眼鳟生长参数比较
Table 3 Comparison of Von Bertalanffy growth parameters for S.curriculus
项目item 西江-珠江三角洲(80年代) Xijiang-Pearl River Delta (80′s) 西江肇庆段Zhaoqing section of Xijiang River 长江干流芜湖段Wuhu Reach of Yangtze River b 3 3.136 3.165 9 k 0.053 3 0.135 9 0.232 8 t0 -0.851 2 -0.396 1 -1.911 Ti 19.8 8.00 3.04 Wt 10 901.2 1 059.6 103.80 L∞ 1 183.6 616.3 320.47 W∞ 36 676.3 5 048 345.15 -