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SEASONAL-VARIATION IN GROWTH, MORTALITY AND FAT STORES OF ROACH AND PERCH IN LOUGH-NEAGH, NORTHERN-IRELAND

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Griffiths, D and KIRKWOOD, RC (1995) SEASONAL-VARIATION IN GROWTH, MORTALITY AND FAT STORES OF ROACH AND PERCH IN LOUGH-NEAGH, NORTHERN-IRELAND. JOURNAL OF FISH BIOLOGY, 47 (3). pp. 537-554. [Journal article]

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Abstract

The annual cycle for roach (Rutilus rutilus) and perch (Perca fluviatilis) in Lough Neagh, Northern Ireland can be divided into warm `growing' and cold `non-growing' seasons. Summer water temperatures declined between 1991-1993, as did the sizes of 0+ fish of both species. Small overwinter increases in length occurred after poor summers due, in roach, to size-selective mortality. Fat content was size-dependent and increased over the summer in both species. Ail sizes of roach but only small perch lost fat overwinter. Dead roach collected towards the end of the 1992/3 winter had significantly less fat than live individuals. The allocation of energy to growth (and ultimately reproduction) and to fat (and overwinter survival) was modelled as a tradeoff, assuming that fat has twice the energy density of protein and using observed summer and winter changes in body composition. The predicted allocation optima were close to observed values but, for roach, this entailed a substantial survivorship cost. (C) 1995 The Fisheries Society of the British Isles

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Environmental Sciences
Research Institutes and Groups:Environmental Sciences Research Institute > Freshwater Sciences
ID Code:13756
Deposited By:Mrs Linda Allen
Deposited On:31 May 2010 11:05
Last Modified:28 Mar 2012 16:27

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