New contribution to the reproductive features of bluemouth Helicolenus dactylopterus dactylopterus from northeast Atlantic (Azores Archipelago)

Autor:	Gui M. Menezes, Susana Estácio, Ana Mendonça, Mário R. Pinho, Eduardo Isidro, Octávio Melo
Rok vydání:	2006
Předmět:	Gonad Helicolenus Ecology Fish species Zoology Aquatic Science Biology Oceanography Reproductive cycle biology.organism_classification Spawn (biology) medicine.anatomical_structure medicine Azores archipelago sense organs
Zdroj:	Scientia Marina. 70:679-688
ISSN:	1886-8134 0214-8358
DOI:	10.3989/scimar.2006.70n4679
Popis:	SUMMARY: This work describes and identifies the macroscopic and corresponding microscopic changes of the gonads of an important commercial fish species, Helicolenus dactylopterus dactylopterus, from Azores Archipelago. The new contribution relates the macroscopic scale with the histological stages. The annual changes in the gonad, together with the analysis of the monthly gonadosomatic indices, and complementary observations with scanning electron microscopy, allow us to conclude that the females are internally inseminated between July and November and spawn between January and March. There is a separation between female and male reproductive cycles. The overall sex-ratio observed was 1:1, but seasonal and length related differences were observed. This suggests differences and changes in availability, probably related to the annual reproductive cycle and changes in feeding behaviour
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8a360e96266385689fe166311db26cee https://doi.org/10.3989/scimar.2006.70n4679 Zobrazit plný text záznamu