Growth and reproduction of Indo-Pacific bottlenose dolphins (Tursiops aduncus) incidentally caught in gillnets off Zanzibar, Tanzania
(English)Article in journal (Refereed) Submitted
Life history parameters of Indo-Pacific bottlenose dolphin (Tursiops aduncus) were examined in 69 specimens incidentally caught in gillnet fisheries off Zanzibar, Tanzania between 2000 and 2008. Calves were born at a body length of 103 cm and a weight of 12-15 kg. Sexual maturity in females was reached at 7-8 years and body length 190-200 cm. Sexual maturity in males was attained at 16 years and a body length of 213 cm. Calving occurred throughout the year with a peak November-March, after a gestation period of 12.3 months. The estimated pregnancy rate was 0.10 based on the proportion pregnant mature females in the sample and 0.58 based on the occurrence of Corpora Lutea in the ovaries. The average calving interval was calculated to 2.7 years. The results are important for assessment of fisheries bycatch mortality and conservation and management of Indo-Pacific bottlenose dolphins in western Indian Ocean
Indo-Pacific bottlenose dolphin, Tursiops aduncus, life history parameters, growth, reproduction, sexual maturity, ovary, Corpora Lutea, pregnancy rate, gestation period, calving interval, gillnet fisheries, byctach, Zanzibar, Tanzania, Indian Ocean.
Research subject Animal Ecology
IdentifiersURN: urn:nbn:se:su:diva-34454OAI: oai:DiVA.org:su-34454DiVA: diva2:284839