Age and growth of channel catfish Ictalurus punctatus in Lake Kitaura, Ibaraki Prefecture, Japan

Tomoki Endo, Kouki Kanou, Fumitaka Tokoro, Masahito Arai, Satoshi Katayama

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Age and growth rates of the invasive exotic catfish Ictalurus punctatus were assessed by examination of otolith sections of 937 specimens (3.8-57.2 cm in standard length, SL) collected in Lake Kitaura, Ibaraki Prefecture, Japan. An opaque zone on the otolith margin, formed once a year from May to June, coincided with the peak spawning season. Von Bertalanffy growth equations differed significantly between sexes, being SLt = 63.5{1? exp[?0.120(t +0.416)]} for males and SLt= 56.5{1-exp[-0.134(t +0.437)]} for females [SLt is SL (cm) att (year)]. The estimated maximum ages for males and females were 14 and 13 years, respectively. An age-length key for converting length frequencies into age frequencies was established, and is a useful tool for assessing the population status of the species and the development of effective management strategies.

Original languageEnglish
Pages (from-to)18-24
Number of pages7
JournalNippon Suisan Gakkaishi (Japanese Edition)
Volume83
Issue number1
DOIs
Publication statusPublished - 2017 Jan 1

ASJC Scopus subject areas

  • Aquatic Science

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