Fecundity regulation strategy of the yellowfin tuna (Thunnus albacares) in the Western Indian Ocean

<p>Tuna is one of the important fishery commodities in Indonesia, including tuna caught by longliners in Indian Ocean. The most popular of tuna is yellowfin tuna (Thunnus albacares). Currently, the production of tuna based on the capture fisheries, therefore, in order to preserve its sustainability, the understanding of the biological and reproduction aspect is required. Research on the biological reproduction of this species was conducted at Gondol Research Institute for Mariculture. Samples of female gonad were collected from Indian Ocean tuna longliners during April to July 2009 from the processing companies within Benoa Port. Result of the histological analysis on 128 female gonads showed that majority of gonads were at the early development level and the only 16 gonads have reached at the mature level. The analysis of the oocyte development showed the asynchronous, indicating that yellowfin tuna is a multiple spawner.</p><p>Keywords: yellowfin tuna, gonad, asynchronous</p>

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Environmental preferences of longlining for yellowfin tuna (Thunnus albacares) in the tropical high seas of the Indian Ocean

Fisheries Oceanography ◽

10.1111/j.1365-2419.2008.00476.x ◽

2008 ◽

Vol 17 (4) ◽

pp. 239-253 ◽

Cited By ~ 21

Author(s):

LI MING SONG ◽

YU ZHANG ◽

LIU XIONG XU ◽

WEN XIN JIANG ◽

JIA QIAO WANG

Keyword(s):

Indian Ocean ◽

Yellowfin Tuna ◽

Thunnus Albacares ◽

Environmental Preferences ◽

The Indian Ocean ◽

High Seas

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Genomic analysis reveals multiple mismatches between biological and management units in yellowfin tuna (Thunnus albacares)

ICES Journal of Marine Science ◽

10.1093/icesjms/fsy102 ◽

2018 ◽

Vol 75 (6) ◽

pp. 2145-2152 ◽

Cited By ~ 11

Author(s):

Rachel B Mullins ◽

Niall J McKeown ◽

Warwick H H Sauer ◽

Paul W Shaw

Keyword(s):

Indian Ocean ◽

Genomic Analysis ◽

Yellowfin Tuna ◽

Thunnus Albacares ◽

Management Units ◽

Spawning Site ◽

Asymmetric Dispersal ◽

Outlier Loci ◽

The Indian Ocean ◽

Mixed Stock

Abstract The South African (SAF) yellowfin tuna (Thunnus albacares) fishery represents a potential example of misalignment between management units and biological processes. The SAF fishery spans an operational stock with a boundary at 20°E, either side of which fish are considered part of Atlantic or Indian Ocean regional stocks. However, the actual recruitment of fish from Atlantic and Indian Ocean spawning populations into SAF waters is unknown. To address this knowledge gap, genomic analysis (11 101 SNPs) was performed on samples from Atlantic and Indian Ocean spawning sites, including SAF sites spanning the current stock boundary. Outlier loci conferred high discriminatory power to assignment tests and revealed that all SAF fish were assigned to the Indian Ocean population and that no Atlantic Ocean fish appeared in the SAF samples. Additionally, several Indian Ocean migrants were detected at the Atlantic spawning site demonstrating asymmetric dispersal and the occurrence of a mixed-stock fishery in Atlantic waters. This study highlights both the spatial inaccuracy of current stock designations and a misunderstanding of interactions between the underlying biological units, which must be addressed in light of local and global declines of the species. Specifically, the entire SAF fishery must be managed as part of the Indian Ocean stock.

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