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ARQ - Life and Marine Sciences

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Browsing ARQ - Life and Marine Sciences by Author "Afonso-Dias, Manuel"

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  • Aspects of the biology of the leaf‐scale gulper shark Centrophorus squamosus (Bonnaterre, 1788) off Madeira archipelago
    Publication . Severino, Ricardo B.; Afonso-Dias, Isabel; Delgado, João; Afonso-Dias, Manuel
    A total of 206 Centrophorus squamosus (Bonnaterre, 1788) with a total length ranging from 89 to 146 cm were captured at an average depth of 1200 metres. Of the 61 females sampled, 34% were gravid, showing an absolute individual fecundity of two to ten embryos (pups). The results clearly indicated that this deepwater shark spawns in the Portuguese waters off Madeira archipelago.
    2009Journal article Open access Show more
  • Atlantic chub mackerel (Scomber colias) spawning season, size and age at first maturity in Madeira waters
    Publication . Vasconcelos, Joana; Afonso-Dias, Manuel; Faria, Graça
    The pelagic chub mackerel, Scomber colias Gmelin, 1789 is one of the most important fishery resources in the Madeira Archipelago. S. colias is caught by a small and coastal purse-seine fleet that traditionally operates around the islands. Monthly samples of chub mackerel were taken from commercial landings, between January 2002 and December 2005. Sex and maturity were assigned by visually inspecting the gonads of 1998 males (17.4-46.0 cm total length, TL; 0-5 yr) and 2108 females (18.0-41.2 cm TL; 0-4 yr) using a five-stages macroscopic maturity scale; 99 specimens with undetermined sex (13.0-26.8 cm TL; 0 yr) were also sampled. The analysis of monthly gonadosomatic indices and maturity stages proportions showed that gonad development started slowly in July-August and increased in October-December, for males and females. Spawning took place between January-April peaking in February-March. Maturity ogives were fitted to the observed proportions of mature males and females by using non-linear methods, to estimate size and age at first maturity: 22.12 cm TL at 1.05 yr for males and 21.55 cm TL at 0.82 yr for females.
    2012Journal article Open access Show more