The reproductive biology of Scyliorhinus canicula in the Bristol Channel, U.K.
In: Journal of Fish Biology. Fisheries Society of the British Isles: London,New York,. ISSN 0022-1112; e-ISSN 1095-8649, meer
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| Trefwoorden |
Elasmobranchii [WoRMS]; Scyliorhinidae Gill, 1862 [WoRMS]
Marien/Kust |
| Author keywords |
Scyliorhinidae; Elasmobranchii; reproductive biology; maturity; oocytes; egg-case deposition; intersexuality; gonadosomatic index |
| Auteurs | | Top |
- Ellis, J.R.
- Shackley, S.E.
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| Abstract |
Among 972 Scyliorhinus canicula, the overall sex ratio (males:females) was 1:1·23. Males matured between 490 and 540 mm LT with 50% maturity at 520 mm. Females matured between 520 and 640 mm LT with 50% maturity at 550 mm. Female gonadosomatic index peaked in May. Fecundity increased with fish length. The egg laying season lasted 10 months with a peak in June and July. The importance of erect, sessile invertebrates such as bryozoans, poriferans and hydroids as egg-case deposition sites has been established. Recently hatched fish were born in an equal sex ratio and at a mean length of 100·5 mm and mean weight of 3·07 g. One intersexual fish is described. |
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