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Reproductive phenology of the Azorean rock pool blenny a fish with alternative mating tactics

Reproductive phenology of the Azorean rock pool blenny a fish with alternative mating tactics
Reproductive phenology of the Azorean rock pool blenny a fish with alternative mating tactics
Both male and female Parablennius sanguinolentus parvicornis were ready to mate by the end of May. Seventy-five per cent of the 1-year-old males were mature, but only 25% of the females reached maturity at this age. In females, gonads formed an increasingly greater proportion of the total weight with age, but in males the proportion decreased. A bimodal distribution of gonadosomatic indices classes was observed in 2-year-old males (intermediate size), which reflected the lower opportunity that intermediate size males have to spend the ejaculates than have the younger and older males. The liver played an important role in the storage of energy before the reproductive season and reserves were utilized during the breeding season. Physical condition was at its lowest in July in both sexes, but in May, just before the breeding season began, large maturing females had significantly lower eviscerated condition than males. This could be due to females investing in oocyte development, while the priority for the males was to reserve their energy for the parental activities to come. In both males and females, older and bigger animals had lower hepatosomatic and body conditions than younger ones.
Parablennius sanguinolentus parvicornis, phenology, alternative reproductive tactics, gonado- and hepatosomatic indices, condition factor, Azores
0022-1112
842-858
Santos, R.S.
7b79b8ec-b3f2-46cb-ab98-bc08b682f1a7
Hawkins, S.J.
758fe1c1-30cd-4ed1-bb65-2471dc7c11fa
Nash, R.D.M.
9f436c35-e5a1-4221-8117-1ef8ac66eb8b
Santos, R.S.
7b79b8ec-b3f2-46cb-ab98-bc08b682f1a7
Hawkins, S.J.
758fe1c1-30cd-4ed1-bb65-2471dc7c11fa
Nash, R.D.M.
9f436c35-e5a1-4221-8117-1ef8ac66eb8b

Santos, R.S., Hawkins, S.J. and Nash, R.D.M. (1996) Reproductive phenology of the Azorean rock pool blenny a fish with alternative mating tactics. Journal of Fish Biology, 48 (5), 842-858. (doi:10.1111/j.1095-8649.1996.tb01480.x).

Record type: Article

Abstract

Both male and female Parablennius sanguinolentus parvicornis were ready to mate by the end of May. Seventy-five per cent of the 1-year-old males were mature, but only 25% of the females reached maturity at this age. In females, gonads formed an increasingly greater proportion of the total weight with age, but in males the proportion decreased. A bimodal distribution of gonadosomatic indices classes was observed in 2-year-old males (intermediate size), which reflected the lower opportunity that intermediate size males have to spend the ejaculates than have the younger and older males. The liver played an important role in the storage of energy before the reproductive season and reserves were utilized during the breeding season. Physical condition was at its lowest in July in both sexes, but in May, just before the breeding season began, large maturing females had significantly lower eviscerated condition than males. This could be due to females investing in oocyte development, while the priority for the males was to reserve their energy for the parental activities to come. In both males and females, older and bigger animals had lower hepatosomatic and body conditions than younger ones.

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More information

Published date: May 1996
Keywords: Parablennius sanguinolentus parvicornis, phenology, alternative reproductive tactics, gonado- and hepatosomatic indices, condition factor, Azores

Identifiers

Local EPrints ID: 188791
URI: https://eprints.soton.ac.uk/id/eprint/188791
ISSN: 0022-1112
PURE UUID: 30a1fdde-a625-47fc-8760-ed081bdc1ffd

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Date deposited: 27 May 2011 12:49
Last modified: 18 Jul 2017 11:41

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