INVESTIGADORES
BELLEGGIA Mauro
artículos
Título:
Reproductive and population parameters of spiny dogfish Squalus acanthias in the south-western Atlantic Ocean.
Autor/es:
COLONELLO JORGE; CORTES F; BELLEGGIA MAURO; MASSA ANA
Revista:
JOURNAL OF FISH BIOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2016
ISSN:
0022-1112
Resumen:
Theobjective of this study was to estimate reproductive and population parametersof the spiny dogfish Squalus acanthias for the south-western Atlantic Ocean. Intotal, 2714 specimens (1616 males and 1098 females) were collected from surveyscarried out using research vessels. Males ranged from 225 to 861mm total length(LT) and females from 235 to 925mm LT. The size at maturity of females (651 mm)was significantly greater than that of males (565 mm). The maximum proportionof mature individuals (Pmax) of the gestation ogive was <1, which indicatesthat a proportion of mature females was not in gestation. This inactivity maybe explained by the occurrence of resting periods between cycles or by theasynchrony of the reproductive cycle. The estimated Pmax for the maternityogive suggested that about one third ofmature females were in thematernitystage (i.e. with embryos >156 mm). The temporal and spatial co-occurrence ofnon-gravid adult females at different stages of ovarian development, as well asgravid females at all embryonic development stages would indicate that thefemale reproductive cycle in the south-western Atlantic Ocean is asynchronous.The results indicate that S. acanthias is susceptible to fishing pressure onaccount of its length at maturity, extended reproductive cycles and lowfecundity.