Life history of the <i>Pomadasys incisus</i> (Osteichthyes: Haemulidae) of the Canarian Archipelago

Abstract

SUMMARY:Pomadasys incisus is one of the most abundant coaslal demersal species around the Canary Islands. It is a ponochoric species with similar biological characteristic in males and females. The adult sex ratio is not significantly different from 1: 1, and the mean size of males and females is similar. It reaches first maturity at the end of the second year of life (1 83 mm). Spawning takes place throughout the year, Growth analysis reveals that the species is fast-growing and relatively short-lived (7 years). Length at age is well described by the von Bertalanffy growth model. Individuals grow guickIy in their imature first year, attaining approximately 45% of their maximum length. After one year, the annual growth m e drops rapidly. The direct effects of fishing result in changes in abundame. with an 80% reduction from the unexpbited equilibrium level. Recniitment into the cornmercial fisheríes occurs before size at sexual maturity, resulting in al1 spawners being accessible using the current fjshing panem. The length at first capture (168 m) is less than the length,at maturity; 45% of [he total catch are smaller than this, indicating a danger of recniitment-overfishing.Key words: Pomadasys incisus, growth, reproduction, mortality, impact, discard, Canary Islands. RESUMEN: PARAMETROS BIoLXSGICOS DFA POMADASYS INCISUS (OSTEICHTHYES: HAEMULIDAE) EN EL ARCHIPIEMGO CANARIO.-Pvmadasys incisu es una de las especies demersales costeras m& abundantes en laq aguas de las Islas Canarias. Es una especie gonocórica con características que presenta características similares para los machos y hembras. La proporción de sexos no difiere de la relación 1: 1. Las tallas medias son similares para los machos y 1 s hembras. Los individuos de esta especie alcanzan la madurez sexual al final del segundo año de vida (183 rnrn). La puesta tiene lugar durante todo el año. El anáiisis de su crecimiento muestra que la especie es de crecimiento rápido y de longevidad reducida (7 aiíos). La relación entre la talla y la edad es descrita de forma adecuada por el modelo de von Bertalanffy. Los individuos inmaduros crecen de forma rápida durante sus primeros aiios, alcanzando, aproximadamente, el 45 5% de su talla máxima. Después del primer ailo de vida, la tasa de crecimiento se reduce considerablemente. El efecto directo causado por la pesca es una reducción del 80 % de su biornasa con respecto al nivel de equilibrio previo a la explotación. El reclutamiento ocurre antes de alcanzar la talla de madurez sexual y como consecuencia de ello todo el stwk reproductor esta sometido a presihn pesquera según el pau6n de explotación actual. La talla de primera captura (168 mm) es menor que la talla de madurez sexual, con un 45 % del total de individuos capturados por debajo de dicha talla de madurez, lo que apunta hacia una sobrepesca en reclutamiento.Palabras clave: Pomadasys incisus, crecimiento, reproducci6n, mortalidad, impacto, descartes. Islas Canarias. ENTRODUCTIONthe total fish species caught, approximately twentyfive are impacted by the fi...

Otolith growth and age estimation of bastard grunt, Pomadasys incisus (Actinopterygii: Perciformes: Haemulidae), in the Gulf of Tunis (Central Mediterranean)

“…This significant rise in water temperature could involve changes in the metabolic activity of the individuals during spring and summer and could be the main factor responsible for opaque zone deposition. Similar findings have been reported for Pomadasys species, including P. incisus in Canary Islands (Pajuelo et al 2003b) and Pomadasys kaakan (Cuvier, 1830) in Kuwaiti waters (Al-Husaini et al 2001). The significant correlation found between TL and otolith radius (R o ) indicates that this structure is useful for estimating age and for reconstructing past growth history of fishes (Francis 1990).…”

“…Marginal increment analysis demonstrates that one annulus is laid down annually. Pajuelo et al (2003aPajuelo et al ( , 2003b) studied age of Pomadasys incisus in Canary Islands and reported a similar periodicity. In the Gulf of Tunis, dark slow translucent growth zone (organic-rich component) is deposited in winter while clear fast opaque zone (calcium-rich component) is deposited in summer.…”

“…Pomadasys incisus of the Gulf of Tunis has the lowest TL ∞ and growth coefficient (k). In the two studies of Pajuelo et al (2003aPajuelo et al ( , 2003b, estimates of growth parameters were similar because the samples were similar in size range and in number of individuals treated; although, they used the mean back-calculated length at age relation for the first study and the mean length at age for the second one. Thus, the significant differences found in growth rate and TL ∞ values may be, partly, due to differences in the size range of sampled fish; alternatively, they may indicate the existence of different populations of the same species.…”

“…Among the topics investigated were: parasite fauna (Euzet and Ktari 1970), reproduction and length-weight relations (Chakroun-Marzouk and Ktari 1995, 2006, Kapiris et al 2008, reproduction and feeding habits (Fehri-Bedoui and Gharbi 2008), fish condition, and reproductive biology (Villegas-Hernández et al 2015). Only two studies deal with life history and growth of Pomadasys incisus in the Canary Islands (Pajuelo et al 2003a(Pajuelo et al , 2003b, but the growth of this species is unknown in the Mediterranean Sea. Therefore, the presently reported study represents the first attempt to determine the age and growth of the bastard grunt in the southern Mediterranean.…”

Reproductive biology of the Sompat grunt, Pomadasys jubelini (Cuvier, 1830) in Côte d’Ivoire lagoons complex (West Africa)

“…Pomadasys jubelini is a gonochoric species with no evidence of sexual dimorphism, as for all species of the genus Pomadasys (Pajuelo et al, 2002). In the present study, the sex ratio was (1: 0.82) in Grand-Lahou lagoon, (1: 0.63) in Ebrie lagoon, and (1: 0.56) in Aby lagoon in favour of males.…”