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Title

Reproductive biology of two macrourid fish, Nezumia aequalis and Coelorinchus mediterraneus, inhabiting the NW Mediterranean continental margin (400-2000 m)

AuthorsFernandez-Arcaya, U. ; Ramírez-Llodra, Eva ; Rotllant, Guiomar ; Recasens, Laura ; Murua, Hilario; Quaggio-Grassiotto, I.; Company, Joan B.
KeywordsMacrourid fish
Reproduction
Fecundity
Deep sea
Spermatogenesis
NW Mediterranean
Issue DateAug-2013
PublisherPergamon Press
CitationDeep-Sea Research Part II: Topical Studies in Oceanography 92: 63-72 (2013)
AbstractNezumia aequalis and Coelorinchus mediterraneus are abundant species on the upper and lower continental slopes, respectively, in the Mediterranean Sea. A study on the reproductive strategy of the two species was conducted on the Catalan margin (NW Mediterranean). The reproductive cycle of both species was investigated using visual analyses of gonads and histological screening. The shallower species, N. aequalis, showed continuous reproduction with a peak of spawning females in winter months. In contrast, the deeper-living species, C. mediterraneus, showed semi-continuous reproduction with a regression period during the spring. Juveniles of N. aequalis were present in all seasons, but most abundant in the spring. Only two juveniles of C. mediterraneus were found. Both species had asynchronous oocyte development. The average fecundity of N. aequalis was 10,630 oocytes per individual, lower than known for the same species in the Atlantic Ocean. The fecundity of C. mediterraneus was measured for the first time in this study, with an average of 7693 oocytes per individual. Males of both species appear to have semi-cystic spermatogenesis. © 2013 Elsevier Ltd.
DescriptionSpecial issue Deep-Sea Biodiversity and Life History Processes.-- 10 pages, 7 figures, 5 tables
Publisher version (URL)http://dx.doi.org/10.1016/j.dsr2.2013.03.003
URIhttp://hdl.handle.net/10261/90183
DOI10.1016/j.dsr2.2013.03.003
Identifiersdoi: 10.1016/j.dsr2.2013.03.003
issn: 0967-0645
e-issn: 1879-0100
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