|Feeding behaviour of hatchery-reared juveniles of the Japanese flounder following a period of starvation|
Miyazaki, T.; Masuda, R.; Furata, S.; Tsukamoto, K. (2000). Feeding behaviour of hatchery-reared juveniles of the Japanese flounder following a period of starvation. Aquaculture 190: 129-138
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486, more
|Authors|| || Top |
- Miyazaki, T.
- Masuda, R.
- Furata, S.
- Tsukamoto, K.
The effect of starvation on feeding behaviour was studied in hatchery-reared juveniles of the Japanese flounder in the context of improving stock enhancement strategies. Fish (54.0±5.9 mm in total length) were deprived of food (mysids) for 1, 2, or 4 days, and their subsequent feeding behaviour was observed using a video camera. The phase of feeding action, the foraging pattern, the off-bottom duration, and the swimming speed were defined and analyzed. The feeding action was divided into four phases: aim, creep, attack, and return. The foraging patterns were classified into four types. The typical foraging pattern, with a single attack and a quick return to the initial position (type A), became less common as the fish were starved, while there was a greater incidence of slower returns (type B), returns to different positions (type C), and multiple feeding (type D). The frequency of the feeding action and the duration of off-bottom swimming increased as the food deprivation period increased. The swimming speed for creeping to the mysid prey increased, but that of the return decreased as the fish were starved. These changes in feeding behaviour under starvation may prolong the time flounder juveniles spend in the water column and may result in a higher risk of predation. In the stock enhancement program of Japanese flounder, starvation should be avoided to reduce predation and improve survival.