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Titolo:
Importance of diet type, food particle size, and tank circulation for culture of Lake Hallwil whitefish larvae
Autore:
Enz, CA; Schaffer, E; Muller, R;
Indirizzi:
Swiss Fed Inst Environm Sci & Technol, EAWAG, CH-6047 Kastanienbaum, Switzerland Swiss Fed Inst Environm Sci & Technol Kastanienbaum Switzerland CH-6047
Titolo Testata:
NORTH AMERICAN JOURNAL OF AQUACULTURE
fascicolo: 4, volume: 63, anno: 2001,
pagine: 321 - 327
SICI:
1522-2055(200110)63:4<321:IODTFP>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
COREGONUS-CLUPEAFORMIS MITCHILL; HETEROPNEUSTES-FOSSILIS LARVAE; PREY SELECTION; LABEO-ROHITA; LAVARETUS L; LIVE FOOD; GROWTH; SURVIVAL; STOCKING; DRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Muller, R Swiss Fed Inst Environm Sci & Technol, EAWAG, CH-6047 Kastanienbaum, Switzerland Swiss Fed Inst Environm Sci & Technol Kastanienbaum Switzerland CH-6047
Citazione:
C.A. Enz et al., "Importance of diet type, food particle size, and tank circulation for culture of Lake Hallwil whitefish larvae", N AM J AQUA, 63(4), 2001, pp. 321-327

Abstract

A commercial dry diet and both live and frozen zooplankton were compared as food for cultured larvae of Lake Hallwil whitefish Coregonus suidteri during the first 3 weeks after hatching. Whitefish larvae fed live zooplanktongrew considerably larger (16.4 mm final length) than those fed frozen zooplankton (14.4 mm), but mortality did not differ significantly (0% versus 3%). Larvae fed the dry diet reached nearly the same length (13.6 mm) as the fish fed frozen zooplankton. However, mortality of fish fed the dry diet was significantly higher (34%) than that of fish fed live or frozen zooplankton. We conclude that diet acceptance is a key factor for whitefish larvae, accounting for the highest growth rates by larvae fed live zooplankton. We also tested the effect of two additional factors on larval mortality: food particle size and water circulation in the rearing tanks. The size of food pellets was reduced from 200-400 mum to 100-200 mum. The water inflow to the tanks was placed below the water surface to increase the time the dry diet was afloat. Our results showed that neither particle size nor inflow placement affected mortality when fish were fed ad libitum. Nevertheless, feed floating times were prolonged significantly when the inflow was placed below the water surface, making it possible to decrease the feeding frequency, reduce food losses, and, thus decrease the amount of daily ration fed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/02/20 alle ore 11:24:51