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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on February 24, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(4):623-630; doi:10.1093/icesjms/fsp032
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Oocyte development in captive Atlantic horse mackerel Trachurus trachurus

Hilkka O. N. Ndjaula1,2, Tom Hansen3, Maria Krüger-Johnsen1 and Olav Sigurd Kjesbu1

1 Institute of Marine Research, Nordnesgaten 50, PO Box 1870 Nordnes, 5817 Bergen, Norway
2 Department of Biology, University of Bergen, PO Box 7800, 5020 Bergen, Norway
3 Institute of Marine Research, Matre Research Station, 5198 Matredal, Norway

Correspondence to H. O. N. Ndjaula: tel: +47 55 238633; fax: +47 55 238555; e-mail: hilkka.ndjaula{at}imr.no.

Ndjaula, H. O. N., Hansen, T., Krüger-Johnsen, M., and Kjesbu, O. S. 2009. Oocyte development in captive Atlantic horse mackerel Trachurus trachurus. – ICES Journal of Marine Science, 66: 623–630.

This 13-month experimental study focused on developing oocyte production in 101 adult female Atlantic horse mackerel. In addition, proxies of energy patterns in relation to oocyte development were investigated. The fish were captured off western Norway and fed to satiation from October 2005 to November 2006 in two replicate adjacent circular tanks. Monthly histological examination of the ovaries indicated that vitellogenic oocytes were present at all times throughout the study period, but that oocyte development did not progress past the incipient migratory nucleus stage. The oocyte diameter (OD) threshold between pre-vitellogenic and vitellogenic oocytes and the mean OD of the leading cohort were investigated, and no hiatus was observed within the OD size distribution around the 185-µm pre-vitellogenic and vitellogenic threshold. Variation in gonadosomatic index, hepatosomatic index, condition factor, and fat content (as measured by the use of a Distell Fish Fatmeter) increased with oocyte development. The observed development of oocyte recruitment and the absence of a hiatus in the oocyte distribution are characteristics of an asynchronous spawner. The species seems to have a prolonged spawning season, judging from the advanced and variety of maturity stages throughout the study period.

Keywords: captive conditions, condition indices, oocyte development, Trachurus trachurus

Received 15 February 2008; accepted 29 January 2009; advance access publication 24 February 2009.


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