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Studies on incidence mechanism and prevention of injury caused by fish themselves

鱼类自身伤害发生机制及防治研究

基本信息

批准号：
18580194
负责人：
TABATA Mitsuo
金额：
$ 2.46万
依托单位：
Teikyo University of Science & Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18580194/
关键词：
rainbow trout self-feeding fin injury body color change stress relative brightness value 非侵襲的測定非侵襲的攻撃損傷

项目摘要

1. Fish injury should be avoided from the view points of prevention for infection, disease and production quality. Studies were conducted using rainbow trout reared by self-feeder under various conditions of light intensity, trigger switch depth, feeding method, and food regime. Following results were obtained.2. Trigger depth had no significant effect on size heterogeneity, mortality feed wastage, feed conversion ratio (FCR) or the incidence of caudal and dorsal fin splitting and fin erosion. Dorsal fin splitting decreased with time in upper trigger but not in lower trigger fish. Caudal fin erosion increased with time in upper and lower bigger fish.3. Feed regime had no significant effect on the incidence of fin splitting or fin erosion to the caudal upper, caudal lower or dorsal fins, and the incidence of fin splitting did not change over time, irrespective of feed regime. Interestingly, the 1-meal regime significantly hindered recovery from dorsal fin erosion, whilst caudal fin erosion to the upper caudal lobe significantly increased with time in the 1-meal and free access regime.4. The incidence of dorsal, but not caudal, fin damage was significantly greater in hand-fed fish. Dorsal fin damage decreased with time in self-fed but not hand-fed fish. Caudal fin damage decreased with time in both self-fed and hand-fed fish, although there was only a non-significant trend for recovery in self-fed fish.5. In the above experiments, most individuals displayed darker body color when they were damaged in their dorsal and/or caudal fin. The darker body color seemed to be originated from the stress due to damages. Then, image analysis of body color was made to obtain relative value of brightness in local area of lateral body changing with the degree of stress. This experiment of image analysis for non-contact and -invade method made possible to measure fish stress.

1.从预防传染病、病害和提高产品质量的角度考虑，应避免鱼的伤害。本研究以虹鳟鱼为研究对象，在不同的光照强度、触发开关深度、投喂方式、食物种类等条件下，进行自投喂。获得了以下结果.触发深度没有显着影响的大小异质性，死亡率，饲料消耗量，饲料转化率（FCR）或发生率的尾鳍和背鳍分裂和鳍腐蚀。背鳍分裂随着时间的推移，上触发器，但不是在下触发鱼。随着时间的推移，上、下两种大型鱼尾鳍的腐蚀程度均增加.饲料制度没有显着的影响，鳍分裂或鳍腐蚀的发生率，尾上，尾下或背鳍，鳍分裂的发生率并没有随着时间的推移而改变，无论饲料制度。有趣的是，1餐制度显着阻碍恢复从背鳍侵蚀，而尾鳍侵蚀上尾叶显着增加，随着时间的推移，在1餐和自由访问制度。背鳍，但不是尾鳍，鳍损伤的发生率显着更大的手喂鱼。背鳍损伤随着时间的推移而减少，但不手喂鱼。自食鱼和手食鱼的尾鳍损伤均随时间的推移而减少，但自食鱼的恢复趋势不显著。在上述实验中，大多数个体在背鳍和/或尾鳍受损时显示较深的体色。身体颜色变深，似乎是因为受到伤害而产生的压力。然后，对人体颜色进行图像分析，得到侧体局部区域亮度随受力程度变化的相对值。本实验采用非接触式、非侵入式的图像分析方法，使鱼类应力测量成为可能。