Can the presence of a large conspecific improve the production and welfare of groups of smaller self‐feeder competent rainbow trout?
Can the presence of a large conspecific improve the production and welfare of groups of smaller self‐feeder competent rainbow trout?
复制标题
大型同种鱼的存在能否提高具有自食能力的小型虹鳟鱼群体的产量和福利？
DOI：
10.1111/j.1365-2109.2011.02967.x
复制
发表时间：
2012
影响因子：
2
通讯作者：
M. Tabata
中科院分区：
文献类型：
--
作者：
M. Flood;C. Noble;R. Kagaya;M. Tabata
这项研究考察了将大型自食性虹鲑鱼Oncorhynchus mykis(Walbaum)(~665 g)放入较小的自食性能力同种(~234 g)群体中对生产和福利的影响。对福利(攻击性、鳍损伤、状况和死亡率)和生产(自食者的利用和增长)的成本和收益进行了审查。这项为期8周的实验使用了六组小鲑鱼；三个包含一条大鲑鱼的处理组和三个对照组。4周后，将大鱼从处理组中移出，并添加到对照组，从而逆转了处理。虽然人们认为，较大的鱼的存在会在较小的同种情况下抑制攻击性，但这并没有发生。事实上，在最初的4周内，当有大型鲑鱼存在时，攻击性显著(P=0.036)更高。其他福利指标、自动喂食器利用率和生产参数之间没有显著差异。从生产和福利的角度来看，这些结果表明，除了最初增加攻击性外，当所有鱼类都具有自我摄食能力时，较大的鱼类并不代表在配备自食性的池塘中养殖较小同种鱼的显著好处或风险。
This study examined the production and welfare effects of including a large self-feeder competent rainbow trout, Oncorhynchus mykiss (Walbaum) (~665 g) in groups of smaller self-feeder competent conspecifics (~234 g). Costs and benefits were examined for both welfare (aggression, fin damage, condition and mortality) and production (self-feeder utilization and growth). The 8-week experiment used six groups of small trout; three treatment groups containing a large trout and three control groups. After 4 weeks the large fish were removed from treatment groups and added to control groups, thus reversing the treatments. Whilst it was thought that the presence of a larger fish would suppress aggression in smaller conspecifics this did not occur. In fact aggression was significantly (P = 0.036) higher when large trout were present during the first 4 weeks. No significant differences were found between other welfare indicators, self-feeder utilization or production parameters. From a production and welfare perspective these results suggest that with the exception of initially increasing aggression larger fish do not represent a significant benefit or risk to smaller conspecifics being cultured in self-feeder equipped tanks, when all fish are self-feeder competent.
触发深度对池养虹鳟Oncorhynchus mykiss(Walbaum)自食性利用、生长及垂直分布的影响
DOI：
--
发表时间：
2007
期刊：
Aquaculture 273
影响因子：
--
作者：
C.Noble;K.Mizusawa;M.Tabata
通讯作者：
M.Tabata