Fecundity of the Japanese crayfish, Cambaroides japonicus: Ovary formation, egg number and egg size

Kazuyoshi Nakata, Seiji Goshima

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Ovary formation, egg number and egg size was studied to examine the fecundity of the Japanese crayfish Cambaroides japonicus. From histological observations of ovaries, the ovarian eggs of C. japonicus developed as asynchronous oocytes. Many well-grown oocytes were in the ovary after spawning, as well as before spawning. The smallest carapace length of ovigerous females was 15.2 mm. The pleopodal egg number ranged from 22 to 75 and significantly increased with female body size. Both egg diameters (2.13-2.50 mm) and weights (0.009-0.017 g) also significantly increased as the female body size increased, but were variable even for the same size crayfish. We conclude that larger females should be used for seed production of C. japonicus because of its high fecundity and large eggs. Mature females spawn only once a year in natural habitats, but multiple spawning can be artificially induced within 1 year because of well-grown oocytes that remain in the ovary after spawning. Thus, we recommend that an effective technique for artificial induction of multiple spawning be developed from our results.

Original languageEnglish
Pages (from-to)335-343
Number of pages9
JournalAquaculture
Volume242
Issue number1-4
DOIs
Publication statusPublished - Dec 20 2004
Externally publishedYes

Keywords

  • Cambaroides japonicus
  • Crayfish
  • Egg number
  • Egg size
  • Ovary formation

ASJC Scopus subject areas

  • Aquatic Science

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