Lipid content in rainbow trout (Oncorhynchus mykiss) fry and parr reared in spawning tributaries of Lake Taupo, New Zealand

Abstract

The total lipid content of fry (25-30 mm) and parr (55-110 mm) of rainbow trout (Oncorhynchus mykiss Richardson 1836) was measured in spring 1996 and 1997 and in autumn 1997 in six trout-rearing tributaries of Lake Taupo, New Zealand. The fat content of fry was variable between streams and some streams had a higher inter-annual variation than others. The fat content of parr was also variable among streams but no difference could be found between seasons. The streams that produced fry with high fat content did not always produce parr with high fat content.

Technical basis for polar and nonpolar narcotic chemicals and polycyclic aromatic hydrocarbon criteria. III. A polyparameter model for target lipid partitioning

“… b Daphnia magna critical body burden conversions from wet weight to per total lipid basis were obtained from Dedual [43] …”

“…Pond snail Mixed types 9 [22] a Lipid fraction of 2.90% was assumed for O. mykiss [42]. b Daphnia magna critical body burden conversions from wet weight to per total lipid basis were obtained from Dedual [43]. c Chlorella pyrenoidosa data was used in lieu of C. vulgaris.…”

Variation of juvenile Atlantic salmon (Salmo salar) body composition along sedimentary links*

“…The influence of distinct fluvial habitat types over smaller spatial scales is however less documented. Similarly, other studies have reported differences in lipid content of rainbow trout juveniles (Oncorhynchus mykiss Walbaum) reared in different tributaries (Dedual 2002) and of juvenile Atlantic salmon originating from sites differing in water temperature (Berg et al 2006). Interesting trends in the body composition were observed but our initial hypothesis, that fish of the upstream sections have higher energy content, was nevertheless not verified.…”

“…For juvenile salmonids, energy acquired through feeding is allocated for processes such as maintenance, somatic growth, overwinter survival and early maturation or smoltification (Jonsson & Jonsson 1998;Post & Parkinson 2001;Morgan et al 2002;Dempson et al 2004). Proximate body composition is the direct consequence of the allometric relationships of feeding and metabolism, the activity levels, life-history strategy and the spatio-temporal variations in biotic and abiotic factors (Gardiner & Geddes 1980;Berg & Bremset 1998;Jonsson & Jonsson 1998;Dedual 2002;Morgan et al 2002;Dempson et al 2004;Berg et al 2006). The influence of seasonal variations of these factors is especially evident in temperate and sub-Arctic regions where lipids are stored during summer to be mobilised during winter when food is scarce (Gardiner & Geddes 1980;Berg & Bremset 1998;Finstad et al 2004;Naesje et al 2006).…”

“…While many previous studies have covered the variations in the proximate body composition of wild juvenile salmonids at specific locations through time (Gardiner & Geddes 1980;Berg & Bremset 1998;Dedual 2002;Morgan et al 2002;Dempson et al 2004;Berg et al 2006;Naesje et al 2006), only little information is available on the spatial variations related to habitats conditions (Dedual 2002;Dempson et al 2004;Berg et al 2006). Differences in the body composition of adult and juvenile Atlantic salmon (Salmo salar L.) originating from contrasting environments such as riverine ⁄ estuarine and fluvial ⁄ lacustrine habitats have been previously observed (Cunjak et al 1990;Jonsson et al 1997).…”