Reproduction, age, growth and mortality of axillary seabream, Pagellus acarne (Sparidae), from the Canarian archipelago

Abstract

Axillary seabream Pagellus acarne "Risso 0715# caught o} the Canary Islands from January 0880 to December 0883 were studied[ The length range of the catches was between 00 and 20 cm\ with a modal distribution between 06 and 10 cm[ The overall ratio of males to females was 0]0[63[ Males were observed up to a length of 13 cm[ Hermaphrodites were re! corded at lengths between 04 and 12 cm[ The species was char! acterized by protandric hermaphroditism[ The reproductive season extended from October to March\ with a peak in spawn! ing activity in DecemberÐJanuary[ The size at sexual maturity was 04[7 cm total length "1 years old# for males and 08[3 cm total length "2 years old# for females[ The total lengthÐtotal weight relationship for the entire population is described by the parameters a 9[9957\ and b 2[1390[ Otolith age readings showed that the population exploited consisted of 09 age groups "0Ð09 years#\ including a very high proportion of individuals between 0 and 3 years old[ The von Bertalan}y growth par! ameters for all individuals were L 21[87 cm\ k 9[11 years −0 \ and t 9 −9[76 years[ Males grew comparatively slower than females[ The instantaneous rates of mortality for all _sh were Z 9[85 years −0 \ M 9[29 years −0 \ and F 9[55 years −0 [ The exploitation ratio and the length at _rst capture were\ respectively\ E 9[58 and LC 49 05[0 cm[ The stock is overexploited\ therefore measures such as closed seasons or changes in _shing patterns would be desirable to safeguard the spawning stock and recruits[

Spatial variation in demography of an estuarine teleost: implications for population and fishery assessments

“…These results suggest that females grew faster and attained greater FLs than males (a previous study on A. australis did not discriminate between genders; Pollock 1982). This result is consistent with reports on many other Sparidae (Morison et al 1998, Pajuelo & Lorenzo 2000, Pajuelo et al 2006, Alós et al 2010), but gender-related growth patterns in contrast to this are apparent within the family (Pajuelo & Lorenzo 2003, Brouwer & Griffiths 2004, Dulčić et al 2011) and can be confounded due to the prevalence of protandric hermaphroditism displayed by several species, including A. australis (Pollock 1982, Buxton 1993, Pajuelo & Lorenzo 2000, Abou-Seedo et al 2003, Pajuelo et al 2006). Further work is required to determine the levels and effects of hermaphroditism on s exspecific growth rates of A. australis.…”

Growth and reproduction of Boops boops, Dentex macrophthalmus, Diplodus vulgaris, and Pagellus acarne (Actinopterygii: Perciformes: Sparidae) from east-central Aegean Sea, Turkey

“…Monteiro et al (2006) stated the reproduction season of bogue in Portugal (Algarve) extends from late winter to spring between February and May, which is in accordance with our results. Comparing the reproduction season of this study with those of Pajuelo and Lorenzo (2000), reproduction season of axillary seabream substantially differs in Canary Islands as they reported the reproductive season extended from October to March, with a peak in spawning activity in December-January. The differences could be attributable to geographic discrepancy.…”

Determination of age and growth of the striped seabream <i>Lithognathus mormyrus</i> (Sparidae), in the Canary archipelago by otolith readings and backcalculation

“…In the otoliths of the striped seabream off the Canaries, the opaque rings are formed when the sea temperature reaches the highest values (24ºC, August) and the food is more abundant, and the translucent ones when the temperature reaches the lowest values (18ºC, February). The evidence presently available suggests that a seasonal temperature difference of 6ºC might be sufficient to cause ring formation (Morales-Nin and Ralston, 1990 (Pajuelo and Lorenzo, 1995, 1998, 1999, 2000.…”