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

D Griffiths, RC KIRKWOOD

    Research output: Contribution to journalArticle

    67 Citations (Scopus)

    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
    LanguageEnglish
    Pages537-554
    JournalJournal of Fish Biology
    Volume47
    Issue number3
    Publication statusPublished - Sep 1995

    Fingerprint

    Rutilus rutilus
    Northern Ireland
    perch
    seasonal variation
    lipids
    summer
    Perca fluviatilis
    winter
    British Isles
    energy density
    body composition
    water temperature
    survival rate
    lipid content
    fisheries
    energy
    fish
    proteins

    Cite this

    @article{d49943bcee3842eca2f7e3c2dbcfe7ee,
    title = "SEASONAL-VARIATION IN GROWTH, MORTALITY AND FAT STORES OF ROACH AND PERCH IN LOUGH-NEAGH, NORTHERN-IRELAND",
    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",
    author = "D Griffiths and RC KIRKWOOD",
    year = "1995",
    month = "9",
    language = "English",
    volume = "47",
    pages = "537--554",
    journal = "Journal of Fish Biology",
    issn = "0022-1112",
    number = "3",

    }

    SEASONAL-VARIATION IN GROWTH, MORTALITY AND FAT STORES OF ROACH AND PERCH IN LOUGH-NEAGH, NORTHERN-IRELAND. / Griffiths, D; KIRKWOOD, RC.

    In: Journal of Fish Biology, Vol. 47, No. 3, 09.1995, p. 537-554.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AU - Griffiths, D

    AU - KIRKWOOD, RC

    PY - 1995/9

    Y1 - 1995/9

    N2 - 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

    AB - 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

    M3 - Article

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    SP - 537

    EP - 554

    JO - Journal of Fish Biology

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    JF - Journal of Fish Biology

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