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A non‐destructive morphometric technique for estimation of body and mesenteric lipid in Arctic charr: a case study of its application
Author(s) -
Adams C. E.,
Huntingford F. A.,
Jobling M.
Publication year - 1995
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1995.tb01875.x
Subject(s) - biology , mesenteries , linear regression , zoology , anatomy , statistics , mathematics
Weight and eight linear measurements were made on Arctic charr from the domesticated Hammerfest strain from Norway and offspring of wild charr of a pelagic morph from Loch Rannoch, Scotland. Guts and mesenteries were removed from the Hammerfest charr only, and the amount of lipid in both carcass and mesenteries measured by Soxhlet extraction. Lipid was extracted from the whole body of the Loch Rannoch charr. Multiple regression analysis was used to derive morphometric predictors of total lipid for the Hammerfest charr and percentage body lipid for the Loch Rannoch charr, the regressions explaining 83 and 59% of variance respectively. For the Hammerfest charr, multiple regression also provided a reliable predictor of mesenteric fat, accounting for 65% of its variance. Hammerfest charr that exhibited high aggression rates had 53% more whole body lipid and 100% more mesenteric fat than those with low aggression rates, using direct measures of lipid levels. Indirect, morphometrically‐derived measures of lipid levels gave almost identical results. It is concluded that morphometric techniques can provide estimates of both whole body and mesenteric lipid in studies requiring repeated measures on the same individuals.