Abstract
Female Rhizoprionodon acutus were found to mature between 62 and 74 cm total length (LT) whereas males matured between 63 and 71 cm L T. The LT at 50% maturity was 64·3 cm for females and 64·7 cm for males. Litter size varied from one to six embryos, and was positively correlated with maternal LT. Female embryos outnumbered males by a ratio of 2·3:1. The size at birth was c. 37 cm LT. Full-term embryos and post-partum females were observed during all seasons although their occurrence was highest in spring. Spermatozoa were rarely recorded in the oviducal gland, indicating that this species does not store sperm. It was not possible to generate maturity curves for Iago omanensis but it was evident that females matured by the time they reached 35 cm and males were mature by 31 cm LT. This species displayed a clearly defined reproductive cycle with parturition occurring primarily in spring, after a gestation period of c. 1 year. Maximal embryo size was 19 cm LT while maximal litter size was 24 embryos. The oviducal gland appeared to act as a seminal receptacle and it appeared that females may utilize these stores by not mating every year.
Original language | English |
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Pages (from-to) | 1662-1678 |
Number of pages | 17 |
Journal | Journal of Fish Biology |
Volume | 68 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jun 2006 |
Externally published | Yes |
Keywords
- Iago omanensis
- Oman
- Oviducal gland
- Reproduction
- Rhizoprionodon acutus
- Shark
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Aquatic Science