文章摘要
养殖军曹鱼稚鱼骨骼畸形研究
Skeletal deformities in the juveniles of cultured cobia (Rachycentron canadum)
投稿时间:2020-12-13  修订日期:2021-02-08
DOI:
中文关键词: 军曹鱼  稚鱼  硬骨—软骨双染色  骨骼畸形
英文关键词: Rachycentron canadum  juvenile  double staining  skeletal deformities
基金项目:国家现代农业产业技术体系专项资金资助(CARS-47);广东海洋大学科研启动经费资助项目;广东省科技计划2017B020245001项目
作者单位E-mail
毛非凡 广东海洋大学水产学院 435230060@qq.com 
陈刚 广东海洋大学水产学院  
马骞 广东海洋大学水产学院 maq@gdou.edu.cn 
周启苓 广东海洋大学水产学院  
施钢 广东海洋大学水产学院  
黄建盛 广东海洋大学水产学院  
邝杰华 广东海洋大学水产学院  
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中文摘要:
      本研究采用硬骨—软骨双染色技术对常规养殖条件下的军曹鱼(Rachycentron canadum)稚鱼全骨骼进行染色,观察并分析其骨骼畸形发生部位及相应的畸形类型。结果表明, 在同一批次繁育的180个军曹鱼稚鱼(25日龄)骨骼标本中,有72个标本存在畸形情况,畸形率为40.00%。骨骼畸形类型共计22种, 畸形率由高到低主要表现为米克尔氏软骨畸形、尾上骨缺失、脉棘分叉、基舌骨异位和尾上骨愈合等;所有骨骼畸形均未表现出显著可见的外部形态变化。但正常个体与骨骼畸形个体的全长存在极显著差异(P<0.01),相关结果表明骨骼畸形对军曹鱼生长产生了影响。相关结果为研究鱼类骨骼畸形的发生过程和原因、减少畸形率和优化苗种培育养殖条件奠定理论基础。
英文摘要:
      The cobia (Rachycentron canadum) is an increasingly important marine fish with significant potential for aquaculture China. Skeletal malformations are fundamental problem -which severely decrease the production efficiency and profitability of cobia aquaculture by affecting their externalmorphoiogy, growth, and survival. In this study, we documented skeletal deformities in tank-reared cobia juveniles(n=180). Based on observations of cleared and double-stained specimens, the skeletal deformities were described. As a result, 72 out of the 180 fish were deformed (with a deformity rate of 40.00%), and a total of 22 types of skeletal malformations were identified. These skeletal malformations were found on 25 days after hatching cobia juveniles, the malformations included Meckel’s cartilage deformity, basihyal deformity, basihyal allotopia, lowered hyoid arch, lordosis, vertebra deformity, bifurcated neural spines, bifurcated haernal spines, haernal spines fusion, cartilage redundancy, epural deficiency, epural fusion, epural deformity, hypural deficiency, hypural and parhypural fusion, hypural deformity, bifurcated pterygiophore, pterygiophore deformity, pterygiophore redundancy, pterygiophore allotopia, anal fin ray redundancy, dorsal fin spine deficiency. Malformations were most common in the cranium(17.22% of specimens) and caudal fin(15.56% of specimens), the highest incidence of skeletal deformities is Meckel’s cartilage deformity(12.22%) and epural deficiency(7.78%). All the fish with these skeletal deformities showed no visible morphological changes. In addition, a significant difference in the total length was found between normal fish and individuals with deformities(P<0.01). There were significant differences in total length(TL) between normal fish and individuals with cranium deformities(P<0.01) and caudal fin malformations(P<0.01). The TL of individuals with dorsal and anal fin deformities was significantly differented from those with cranium malformations(P<0.05) and caudal fin malformations(P<0.05). These results provide insights into the skeletal developmental process and optimization of rearing conditions for cobia.
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