Study on large-scale artificial seedling breeding technology of Tapes dorsatus
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摘要: 基于钝缀锦蛤 (Tapes dorsatus) 规模化养殖面临的种苗供应问题,采用单因素对比实验法,开展了钝缀锦蛤苗种繁育关键技术研究,为其种苗大规模培育提供参考。结果表明:1) 在人工控温条件下,采用虾塘复合藻代替纯种单胞藻对亲本进行促熟,促熟率比对照组提高了282.6%。2) 通过升温加阴干诱导等一系列措施进行催产,亲贝催产率比对照组提高了50.9%。3) 通过添加益生菌构建有益微生态系统,育苗期间不换水,幼虫浮游期成活率、生长速度和稚贝育成率等指标均显著高于对照组。4) 采用立体采苗器结合池底进行立体附苗,稚贝育成率和单位面积产量分别提高了76.6%和76.5%。5) 按体质量5%上选的亲贝作为选育组,稚贝的壳长、体质量和稚贝育成率分别比对照组提高了6.67%、17.03%和8.43%;壳长和体质量变异系数分别降低了29.13%和55.29%;稚贝期壳长和体质量的现实遗传力“h2”分别达到0.65和0.72。采用研究建立的集成创新技术进行钝缀锦蛤人工育苗,可获得显著的经济效益,为实现种苗的规模化生产奠定了基础。Abstract: Based on the problem of seedling supply of Tapes dorsatus, we studied the key techniques of seedling breeding of T. dorsatus by a single factor comparison test, so as to provide references for its large-scale artificial breeding. The results show that: 1) With artificial temperature control, we used the compound algae in shrimp pond to promote the ripening of the parents instead of the pure monocytic algae, and the ripening rate was 282.6% higher than that of the control group. 2) By means of a series of measures such as warming and drying in shade to induce spawning, the rate of induced spawning increased by 50.9% compared with the control group. 3) In order to establish a closed seedling technology model, we added effective microorganisms to build a beneficial micro-ecosystem, and did not change the water during the seedling breeding period. The results reveal that the survival rate of larvae in pelagic period, juvenile growth rate and juvenile rearing rate were significantly higher than those of the control group. 4) We collected the spats by using vertival seedling collection combined with the bottom of the pool. The juvenile rearing rate and yield per unit area increased by 76.6% and 76.5%, respectively. 5) Taking the parents with body mass above 5% as breeding group, the shell length, body mass of juvenile and juvenile rearing rate increased by 6.6%, 17.03% and 8.43%, respectively compared with the control group. However, the variable coefficients of juvenile shell length and body mass decreased by 29.13% and 55.29%, respectively. The realized heritability "h2" of shell length and body mass at the juvenile stage reached 0.65 and 0.72, respectively. This study designed a new integrated innovative technology for the artificial seedling breeding of T. dorsatus, which achieves significant economic benefits and lays a foundation for the realization of its large-scale breeding of seedlings.
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表 1 钝缀锦蛤两个发育群体性状参数
Table 1. Traits parameters of two T. dorsatus developmental populations
性状参数Traits parameter 壳长Shell length/mm 壳高Shell height/mm 壳宽Shell width/mm 体质量Body mass/g 非选育繁育群体Non-selective breeding population 64.9±3.8 (5.86) 43.6±2.5 (5.73) 26.3±0.22 (8.37) 31.6±4.8 (15.19) 选育繁育群体Selective breeding population 70.9±1.7 (2.52) 47.6±1.2 (2.52) 28.7±0.7 (2.44) 38.8±3.3 (8.51) 性状选择差Selection differential of traits (S) 6.0 4.0 2.4 7.2 注:括号里的数值表示繁育群体各性状的变异系数 (%)。 Note: The values in parentheses are the variable coefficients (%) of each trait of breeding population. 表 2 封闭式育苗采用不同微生物制剂的育苗效果对比
Table 2. Effects of different microbial agents on closed seedling breeding
组别 Group 浮游期成活率Survival rate in pelagic period/% 幼虫生长速度Larval growth rate/(μm·d−1) 稚贝育成率Juvenile rearing rate/% 出池稚贝壳长Juvenile shell of length out-of-pool spats/mm 实验组 Test group 89.3±2.91a 9.33±0.25a 25.60±1.18a 1.31±0.026a 对照组2 Control group 2 38.6±1.35c (131.3) 7.45±0.21c (25.2) 7.86±0.35c (225.7) 1.03±0.033b (27.2) 对照组3 Control group 3 67.1±2.02b (33.1) 8.05±0.22b (15.9) 10.52±0.42b(143.3) 1.09±0.030b (20.2) 注:括号里的数值表示实验组相对于对照组的提高率 (%);同列中不同字母表示存在显著性差异 (P<0.05)。 Note: The values in parentheses are the improvement rates (%) of the test group compared to the control group. Values with different letters within the same column indicate significant differences (P<0.05). 表 3 不同采苗方式的育苗效果对比
Table 3. Seedling breeding effects of different seedling collection methods
指标
Index采苗方式
Seedling collection method实验组
Test group对照组4
Control group 4采苗密度
Seedling density/(万粒·m−2)采苗器
池底18.00±0.81(b)
23.58±1.13a(a)
46.40±1.51b (−49.2)采苗量
Seedling quantity/(万粒·池−1)采苗器
池底
合计1 749.6±78.6(a)
707.4±33.9b(b)
2 457.0±75.6a
1 392.0±45.3b (−49.2)
1 392.0±45.3b (76.5)稚贝壳长
Juvenile shell length/mm采苗器
池底
加权平均1.33±0.09(a)
1.16±0.08a(b)
1.28
1.05±0.03b (10.5)
1.05±0.03 (21.9)稚贝育成率
Juvenile rearing rate/%25.6±1.18a 14.5±0.61b (76.6) 注:上标不同小写字母表示各组之间差异显著 (P<0.05),其中不带括号的为组间分析,带括号的为组内分析;对照组的相应数据后括号内的数值表示实验组相对于对照组的提高率 (%)。 Note: Different lowercase letters indicate significant differences among the groups (P<0.05). Those without parentheses are between-group analyses, and those with parentheses are within-group analyses. The values in parentheses after the control group indicate the improvement rate (%) of the test group compared to the control group. 表 4 选育与不选育的育苗效果对比
Table 4. Comparison of seedling breeding effects between selection breeding and non-selection breeding
表 5 钝缀锦蛤幼虫期至稚贝期生长率
Table 5. Growth rate in larval and juvenile stages of T. dorsatus
发育阶段Developmental stage 发育时间Development time/d 壳长生长率Shell length growth rate/(μm·d−1) 壳高生长率Shell height growth rate/(μm·d−1) D形幼虫—壳顶初期幼虫D-shape larvae−Early umbo larvae 5.33 9.76 10.38 壳顶初期幼虫—壳顶中期幼虫Early umbo larvae−Medium term umbo larvae 3 10.63 11.23 壳顶中期幼虫—壳顶后期幼虫Medium term umbo larvae−Post umbo larvae 4 6.85 7.48 壳顶后期幼虫—变态期幼虫Post umbo larvae−Metamorphosis larvae 4 3.83 3.93 变态期幼虫—无管稚贝Metamorphosis larvae−Non siphon juvenile 3 2.03 1.40 无管稚贝—单管稚贝Non siphon juvenile−Single siphon juvenile 20 12.52 10.99 单管稚贝—双管稚贝Single siphon juvenile−Double siphon juvenile 10 9.33 9.05 双管稚贝—实验结束Double siphon juvenile−End of experiment 15 27.10 24.57 -
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