African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12479

Full Length Research Paper

Some reproductive aspects of female bullet tuna, Auxis rochei (Risso), from the Turkish Mediterranean coasts

Abdullah Ekrem Kahraman1*, Didem Göktürk1, Erol RüÅŸtü Bozkurt2, Tülay Akaylı3 and F. Saadet Karakulak1
1Istanbul University, Faculty of Fisheries, Department of Fisheries Technology, Laleli-Istanbul, Turkey. 2Istanbul Education and Research Hospital, Department of Pathology, Samatya-Istanbul, Turkey. 3Istanbul University, Faculty of Fisheries, Department of Aquaculture, Laleli-Istanbul, Turkey.
Email: [email protected]

  •  Accepted: 02 September 2010
  •  Published: 04 October 2010

Abstract

The study aims to investigate some reproductive properties of bullet tuna (Auxis rochei) in Turkish waters. A total of 216 bullet tunas, 110 males (50.93%) and 106 females (49.07%), from the Turkish Mediterranean coasts were sampled monthly between December 2008 and December 2009. The sex ratio was 1:1.04. A total of 106 ovaries were obtained from the females, and these ovaries were histologically examined to determine the reproductive conditions and developmental stages of oocytes. The gonado-somatic index (GSI) values calculated for females indicated that spawning generally occurred between May and September. The most intensive spawning period was observed between June and August. A total of 40 females collected between May and September were sexually mature.  

 

Key words: Bullet tuna, Auxis rochei, reproduction, spawning, Mediterranean Sea.

Abbreviation

GSI, Gonado-somatic index; FL, fork length; TW, total weight.

Copyright © 2024 Author(s) retain the copyright of this article.

This article is published under the terms of the Creative Commons Attribution License 4.0

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