Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Effect of reward level on the number of food demands in yellowtail Seriolaquinqueradiata
Autore:
Kohbara, J; Hidaka, I; Yamashita, M; Ichikawa, M; Furukawa, K; Aida, K; Tabata, M;
Indirizzi:
Mie Univ, Fac Bioresources, Tsu, Mie 5148507, Japan Mie Univ Tsu Mie Japan 5148507 Fac Bioresources, Tsu, Mie 5148507, Japan Univ Tokyo, Grad Sch Agr & Life Sci, Dept Aquat Biosci, Bunkyo Ku, Tokyo 1138657, Japan Univ Tokyo Tokyo Japan 1138657 t Biosci, Bunkyo Ku, Tokyo 1138657, Japan Teikyo Univ Sci & Technol, Dept Biosci, Yamanashi 4090193, Japan Teikyo Univ Sci & Technol Yamanashi Japan 4090193 manashi 4090193, Japan
Titolo Testata:
FISHERIES SCIENCE
fascicolo: 4, volume: 67, anno: 2001,
pagine: 660 - 666
SICI:
0919-9268(200108)67:4<660:EORLOT>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT ONCORHYNCHUS-MYKISS; FEEDING-ACTIVITY; RAINBOW-TROUT; BEHAVIOR; FEEDERS; SYSTEM; GROWTH; FISH;
Keywords:
diel feeding pattern; feeding behavior; reward level; self-feeding; Seriola quinqueradiata; yellowtail;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Kohbara, J Mie Univ, Fac Bioresources, Tsu, Mie 5148507, Japan Mie Univ Tsu Mie Japan 5148507 ources, Tsu, Mie 5148507, Japan
Citazione:
J. Kohbara et al., "Effect of reward level on the number of food demands in yellowtail Seriolaquinqueradiata", FISHERIES S, 67(4), 2001, pp. 660-666

Abstract

The effect of reward level (amount of food received in response to one trigger actuation) on the self-feeding activity of juvenile yellowtails was examined. Three groups of 10 juvenile yellowtails (mean bodyweight, 65.6 g) were allocated randomly to three 200 L cylindrical tanks set in the experiment room. Each tank was illuminated by overhead fluorescent lamps with a light : dark photoperiod regimen of 12 h : 12 h (light 06.00-18.00 hours). A rod-type tactile switch was used to activate the self-feeding device. Three levels of reward were set up by installing a different number of identical feeders for each group: one feeder for the low-reward group, three feeders for the medium-reward group and five feeders for the high-reward group. Each feeder delivered 3-7 pellets per actuation. Yellowtails in all groups showed a clearly diurnal feeding pattern that was synchronized to the given photoperiod. Average number of feeder actuations per day was highest (219/day) in the low-reward group. Second highest was the medium-reward group (116/day), and last was the high-reward group (67/day). The resultant average feed intake per day was 27.1 g/day in the low-reward group, 31.5 g/day in themedium-reward group and 28.4 g/day in the high-reward group. Thus, yellowtails appear to have the ability to regulate the amount of feed delivered daily by increasing the number of food demands when the reward is low and decreasing the number of food demands when the reward is high.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/21 alle ore 15:50:31