Effects of Dietary Protein Concentration on Growth, Survival, and Body Composition of Muskellunge Esox musquinongy and Tiger Muskellunge Esox masquinongy × E. luscius Fingerlings

Abstract

Growth rate, survival and body composition of muskellunge Esox musquinongy (initial mean total length = 125 mm) and tiger muskellunge E. masquinongy × E. lucius (initial mean total length = 115 mm) fed semi‐purified diets differing in protein level from 31 to 40% and 34 to 45%, respectively, were evaluated in 8‐wk trials. The minimum protein level that yielded satisfactory growth rates for muskellunge was 37%, whereas tiger muskellunge growth rates were highest for fish fed a 45% protein diet. Growth differences were caused by changes in protein quantity, not quality, as amino acid ratios were similar for test diets and showed no imbalances among diets. Condition factors for both fishes increased with dietary protein. Survival of muskellunge (73%) and tiger muskellunge (97%) was not pffected by diet type. Body protein increased and fat content decreased in both fishes when fed higher dietary protein. Results suggest that both fishes respond similarly to dietary changes, but that substantial differences exist in protein requirements.

Suitable Dietary Protein/Lipid Ratio for Hybrid, Female Red Sea Bream Pagrus major and Male Black Sea Bream Acanthopagrus schlegeli in the Juvenile Stage, Compared with Red Sea Bream

“…Generally, F 1 performed better on diets with low CP/CL (46/23, 41/28) than did RSB, providing evidence that F 1 had a lower protein requirement than the female parental fish (RSB). These findings are consistent with those in several other species where hybrid fish ordinarily showed lower protein requirements than the maternal fish (Millikin, 1982(Millikin, , 1983Berger and Halver, 1987;Shiau and Huang, 1989;Tuncer et al, 1990;Brown et al, 1992;Swann et al, 1994;Brecka et al, 1995;Twibell and Brown, 1998). Azevedo et al (2004) found a significant difference in growth between rainbow trout and Atlantic salmon by feeding various CP/CL diets.…”

“…It is known that some hybrids have similar or different dietary protein and lipid requirements compared with their parents (Brecka et al, 1995;Twibell et al, 2003). Moreover, there are some suggestions that the hybrids showed heterosis in growth, survival and disease tolerance, distinguishable from their parent species (Logan, 1968;Blanc and Chevassus, 1982;Tuncer et al, 1990;Brecka et al, 1995;Moreau and Pauly, 1999;Harel and Place, 2003).…”

“…Hybrid striped bass Morone chrysops × M. saxatilis, tilapia Oreochromis spp., and channel catfish Ictalurus punctatus × I. furcantus are economically available, attributable to the rapid growth of industrial aquaculture production worldwide (Swann et al, 1994;Brecka et al, 1995;Riche et al, 2004;Rawles et al, 2006, Phelps et al, 2007Ponzoni et al, 2007).…”

The obvious heterosis and genetic characters of intergeneric cross and backcross juveniles between blunt snout bream ( Megalobrama amblycephala ) and topmouth culter ( Culter alburnus )

“…Crosses between different species also resulted in improved environmental and disease tolerances (Dorson, Chevassus, & Torhy, ; Lim, Leamaster, & Brock, ). However, some hybrid offsprings showed lower or no growth rates compared to their parents (Cao et al, ) and some hybridization produced sterile offspring (Brecka, Kohler, & Wahl, ; Galbreath & Thorgaard, ) or only fertile offspring of a single gender.…”

The effects of three commercial diets differing in protein and energy ratios on product quality of pike (Esox lucius)

“…Currently there are recommendations for minimum protein demand for North American relative species * To whom correspondence should be addressed. Phone: +36-82-505 800; e-mail: kucska.balazs@ke.hu muskellunge (Esox masquinongy) (CP 37%) and tiger muskellunge, its hybrid with pike (E. masquinongy × E. lucius) (45%) (BRECKA et al, 1995), but it has not yet been determined in the case of pike. Moreover, the effect of different protein and energy ratios in feeds has not been studied yet.…”