Preliminary studies of age and growth of bigeye tuna (Thunnus obesus) in the western Indian Ocean.
The age and growth of Bigeye tuna from the western Indian Ocean was investigated using both otolith and first dorsal spine. Microincrements, considered as daily depositions , were observed on transverse section of sagittal otoliths of 154 bigeye tuna (Thunnus obesus); they were counted to determine age and establish growth curve. The von Bertalanffy growth curve is FL = 303.9 (1 – e-0.000397 ( t+167.15)), where FL is fork length in cm and t in days. The fish reaches 58 cm at 1 year, 91 cm at 2 years and 120 cm at 3 years of age. We also studied growth by analysing marks on the first dorsal spine of 140 fish. For fish which are 1 and 2 years old, the results obtained with spine and otoliths are comparable, but they are different for older fish . 'Research Group' Centre IRD de Brest, BP 70, 29280 Plouzané, France ; Laboratoire d’Ecologie Marine, Université de la Réunion, 97715 La Réunion, France.
| Main Authors: | , |
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| Format: | Proceedings Paper biblioteca |
| Language: | English |
| Published: |
IOTC
1998
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| Subjects: | Age, Growth rate, Fishery biology, Otoliths, ISW, Indian Ocean, |
| Online Access: | http://hdl.handle.net/1834/71 |
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