养殖密度对虾夷扇贝在浙江南麂海区生长的影响

Influence of stocking density on growth of scallop (Patinopecten yessoensis) in Nanji sea region of Zhejiang

通过设计D1、D2和D33个密度组,每组设3个平行笼,养殖密度分别为5、10和15ind.层-1,研究养殖密度对虾夷扇贝(Patinopecten yessoensis)生长的影响。结果显示,随养殖密度的提高,壳高(SH)、体质量(BM)、相对壳高生长率(GRH)、相对体质量生长率(GRM)、日增壳高(DHG)、日增体质量(DMG)、体质量与壳高比及特定生长率(SGRSH和SGRBM)等参数不断下降,养殖密度对其影响显著(P<0.05)。体质量与壳高随生长时间分别呈现指数生长曲线与逻辑斯谛生长曲线。养殖密度对6月份的相对状态指数(RCF)及5月底的死亡率存在显著影响(P<0.05),分析结果表明,10ind.层-1为适宜的养殖密度。该研究为今后南方海区虾夷扇贝规模化商业养殖提供参考。

A study on the influence of stocking density on the growth of scallop （ Patinopecten yessoensis） was conducted. Three trial groups, D1 , D2 and D3 were designed, with three triparallel cages in each trial group; the stocking densites were 5, 10 and 15 ind-layer , respectively. The results showed that shell height （SH）, body mass （BM）, relative growth rate of shell height （GRH）, relative growth rate of body mass （GRM）, daily shell height gain （DHG）, daily body mass gain （DMG）, the ratio of body mass to shell height and specific growth rate （ SGRSH, SGRBM ） decreased significantly with increasing stocking density, and the effect of stocking density on them was significantly different （ P 〈 0. 05 ）. Logistic curves of shell height with growth time were SHI = 8. 3613/ （e^1.0830-0.0069t＋1） （R^2 =0.9757）, SH2 =7.6059/ （e^-1.4293-0.0069t＋1） （R^2 =0.9747） and SH3 =7.4744/ （e^-1.5033-0.0062t＋1） （R^2 =0. 9740） , respectively; exponent curves of body mass with growth time were BM1 = 32. 2480e^0.0054t （R^2 = 0. 9957）, BM2 = 30. 3170e^0.0050t （R^2 = 0. 9977） and BM3 = 30. 6740e^0.0041t （R^2 = 0. 9923 ）, respectively. The effect of stocking density on relative condition factor （RCF） in June as well as on mortality in late May was significant （P 〈0. 05）. The results indicated that the proper stocking density was 10 ind-layer^-1, which may provide important references for large-scale commercial farming of scallop in the south coastal area of China.