Seasonal Changes in General Condition and Lipid Content of Cod from Inshore Waters

Abstract

The seasonal variations in lipid content and general "condition" of cod, Gadus morhua L., from an inshore population have been determined.Four female and four male fish were chosen from 20 live cod brought in monthly from Terence Bay, Halifax County, Nova Scotia, the fish were pooled and the lipid content determined on the flesh, livers, and gonads. The flesh lipids varied from 0.57% to 0.74% and the oil content of the livers from 15% to 75%.The general "condition" of the fish as expressed by [Formula: see text], the liver condition by [Formula: see text], and the fat content of the liver all showed seasonal variation with maxima in the fall and minima in the spring. KF varied from 0.79 to 1.05 and KL from 1.0 to 4.5. No seasonal variation in the amount of flesh lipids could be detected.

Variations in Major Nutrients and Minerals in Swedish Foods: A Multivariate, Multifactorial Approach to the Effects of Season, Region, and Chain

“…Also in herring, analysis of fish caught in the summer season, July, August, and September, revealed high levels of fat, 160-180 g/kg (Ackman, 1995). Even the low fat cod flesh showed a certain increase of fat content in the late summer season, and a great increase of oil in the liver (Jangaard et al, 1967). In the present study, a lower level of fat in herring was obtained for the summer season (20-100 g/kg, Fig.…”

Temporal variation of total mercury concentrations and burdens in the liver of eelpout Zoarces viviparus from the Forth Estuary, Scotland:implications for mercury biomonitoring

“…Similarly, the mean mercury concentrations in eelpout liver may be more than 3 times higher in winter than in summer, a difference related mainly to the seasonal variation in the LSI, although also, in part, to changes in the liver mercury burden. The LSI of cod has been shown to vary between 2 and 4 % of body weight from winter to summer (Jangaard et al 1967), a similar range to that seen in eelpout. It is possible, therefore, that mercury concentrations in cod liver might show seasonal variations similar to those observed for eelpout, even in an environment relatively uncontaminated by mercury.…”

Relations between migration, reproduction and nutrition in yellowfin bream Acanthopagrus australis

“…Gonosmatic index and 3 indices of nutritional state (Jangaard et al, 1967;Pollard, 1972;Htun-Han, 1978b) were calculated for each fish: where GSI = measure of gonad size in relation to body size; F1 = measure of feeding activity of the fish; VFI = accumulation of visceral fat relative to body size; CF = measure of 'robustness' of the eviscerated carcass. The denominator used in calculating CF eliminates the possibility of bias due to the weights of stomach contents and gonads.…”