The reproductive characteristics of a spined loach population (Osteichthyes, Cobitidae) based on gonad analysis

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The growth, population structure and annual reproductive cycle of a hybrid complex spined loach population of Cobitis elongatoides x C. tanaitica parental species from a lowland stream of Hungary were examined to characterize the reproductive traits. Growth rate did not deviate from other populations and showed significant differences between sexes. Maximum standard length observed was 109 mm (4+) for females and 78 mm (3+) for males. 2+ females contributed substantially to population fecundity. Oocyte development and monthly gonadosomatic index data suggested that fish were indeterminate fractional spawners. Length frequency data of young-of-year specimens however indicated that spawning took place in May. Females were assumed to retain a considerable amount of ripe oocytes postspawning (up to 185 oocytes/g fish weight). Differences in absolute fecundity values found among females of the same length could be almost exclusively attributed to differences in gonad weight. One reason for differences in gonad weight may have been a shortage in the availability of males during spawning due to the female-biased sex ratio of 1:4.6. The investigated complex did not show major differences in the examined population dynamic parameters, compared with other spined loach populations.

Original languageEnglish
Pages (from-to)245-252
Number of pages8
JournalBiologia - Section Zoology
Volume58
Issue number2
Publication statusPublished - Mar 2003

Fingerprint

Cobitidae
gonads
oocytes
fecundity
spawning
gonadosomatic index
reproductive traits
fish
Hungary
lowlands
sex ratio
population structure
population dynamics
Osteichthyes
Cobitis taenia
gender

Keywords

  • Cobitis
  • Fecundity
  • Gonadosomatic index
  • Growth
  • Hybrid complex
  • Oogenesis

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

The reproductive characteristics of a spined loach population (Osteichthyes, Cobitidae) based on gonad analysis. / Erős, T.

In: Biologia - Section Zoology, Vol. 58, No. 2, 03.2003, p. 245-252.

Research output: Contribution to journalArticle

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