Growth patterns and sex ratios of Conger japonicus and C. erebennus in Tokyo Bay

Satoshi Katayama, Seiji Akiyama, Yukiko Shimomura, Hiroaki Kurogi

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Abstract

Ages of the eels Conger japonicus (n?189) and C. erebennus (n?448) in Tokyo Bay were determined by otolith sectioning. The estimated age range of C. japonicus specimens was 1? to 6? yr (modal range 2? to 4? yr), and of C. erebennus 0? to 11? yr (modal range 5? to 8? yr). Many C. erebennus taken measured over 1000 mm in total length and were more than 6? yr. C. erebennus is therefore characterized as a large-sized eel in comparison with C. myriaster, for which size, age estimations and growth patterns are well documented. Males of C. japonicus and C. erebennus accounted for 2-6% of the specimens sampled in this study, suggesting that the population in Tokyo Bay is composed predominantly of females.

Original languageEnglish
Pages (from-to)688-693
Number of pages6
JournalNippon Suisan Gakkaishi (Japanese Edition)
Volume81
Issue number4
DOIs
Publication statusPublished - 2015

ASJC Scopus subject areas

  • Aquatic Science

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