Growth, Spawning, and Management Patterns of Female Euthynnus affinis (Cantor, 1849)) Landed in Kedonganan, Bali

Euthynnus affinis (Cantor, 1849)) is a type of tuna that lives in a tropical environment, with a neritic climate spread across the Indian and Pacific Oceans, and has exceeded the catch limit. So, the spawning time must be known to show a quantitative index that shows the condition of fish gonad matu...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2024-12, Vol.1425 (1), p.012013
Main Authors: Arnenda, Gussasta Levi, Wiratmini, Ngurah Intan, Made Sara Wijana, I
Format: Article
Language:English
Subjects:
Biological effects
Biological sampling
Euthynnus affinis
Females
Fish
Gonads
Growth patterns
Maturity
Oceans
Sampling methods
Sex
Sex ratio
Spawning
Tropical environment
Tropical environments
Tuna
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Summary:Euthynnus affinis (Cantor, 1849)) is a type of tuna that lives in a tropical environment, with a neritic climate spread across the Indian and Pacific Oceans, and has exceeded the catch limit. So, the spawning time must be known to show a quantitative index that shows the condition of fish gonad maturity, often called the gonad maturity index. The spawning season or time occurs when gonad maturity index values in both sexes reach the highest level. A total of 235 fish samples were used, with 73 samples of male gonads and 109 samples of female gonads, and 53 samples were not identified by sex. The biological sampling protocol used a sub-sampling system with a purposive stratified sampling method. Data was collected by direct observation at the Kedonganan Fish Landing Base in 2020. The results showed that the female komo tuna’s growth pattern has a positive allometric pattern with a 26.5-58 cm FL length distribution. The sex ratio is balanced at gonad maturity. The spawning of komo tuna has an asynchronous type and partial spawner nature, spawning at night and spawning throughout the year with peak spawning seasons in August and December.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/1425/1/012013