Record Details

Notes on the reproductive biology of southern bluefin tuna <i style="mso-bidi-font-style:normal">Thunnus maccoyii</i> in the southwestern Indian Ocean

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Notes on the reproductive biology of southern bluefin tuna Thunnus maccoyii in the southwestern Indian Ocean
 
Creator Chen, M.-H.
Chen, K.-S.
Chen, T.-C.
Sun, C.-L.
Chen, C.-Y.
 
Subject Atretic oocyte
Oogenesis
Spent female
Size at first maturity
Spawning season
 
Description 419-424
Gonad samples of 47 bluefin tuna (SBT), Thunnus maccoyii, were collected on
board two Taiwanese longline vessels by fisheries observers in areas A (36°–39°S,
30°–42°E) and B (30°–35°S, 67°–73°E) of the southwestern Indian Ocean, from November 12, 2007 to January 15, 2008 and from
June 13, 2008 to September 2, 2008, respectively. Morphological and
histological observations of the gonad samples were used to determine the
sexual maturity of each fish specimen. Ten mature fish (7 females and 3 males)
were found. One lean female (fork length = 175 cm; dressed weight = 74 kg), caught at 31°S and 70°E on
September 2, 2008, was the only mature fish to possess spent bloodshot flaccid
ovaries. It was found in area B which is at least 5,000 km away from the well known SBT spawning ground.
The remaining nine mature fish constituted one quarter of the SBT caught in
area A. They were
non-spawning mature fish with the smallest fork length of 135 cm for the females and 130 cm for the males.


 
Date 2013-09-02T12:08:27Z
2013-09-02T12:08:27Z
2013-08
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/20896
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.42(4) [August 2013]