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Age, growth, and reproduction of Dentex maroccanus (Actinopterygii: Perciformes: Sparidae) in the saros bay (North Aegean Sea)

100%

Gul G., Ismen A., Arslan M.

Acta Ichthyologica et Piscatoria

2014

tom 44

nr 4

Background. The Morocco dentex, Dentex maroccanus Valenciennes, 1830, is a sparid species, which has economical value and its population is expanding in a 20–500 m depth range throughout the Mediterranean. Worldwide, there is a lack of information about the biology (age, growth, reproductive season, first maturity length) of this species. This study provides the first data on population parameters of D. maroccanus in the Aegean Sea. Materials and Methods. Dentex maroccanus were caught in the Saros Bay (north Aegean Sea) between September 2006 and September 2008. The length–weight relations were determined according to the allometric equation: W = aLb. The spawning season was determined by analyzing the maturity stages and gonadosomatic index, while first maturity length was defined as the size at which 50% of individuals were mature. Growth parameters were estimated using the von Bertalanffy growth equation. Results. The female–male ratio was 4.8 : 1. The total length (weight) of females ranged from 11.4 cm to 25.2 cm (26.2 g to 289.3 g) and of males from 12.8 cm to 24.3 cm (19.8 g to 223.9 g). The growth parameters were calculated as L∞ = 25.31 cm, K = 0.49 year–1, t0 = –0.30 year. The length at first maturity for females and males was 13.0 cm and 15.8 cm, respectively. Monthly values of the gonadosomatic index indicated that spawning occurred mainly between June and September. Conclusion. Results reported in this work will contribute to the knowledge on the biology of D. maroccanus in the north Aegean Sea and also to a better understanding of its role in the marine ecosystem.

Reproductive biology of the spotted flounder, Citharus linguatula (Actinopterygii: Pleuronectiformes: Citharidae), from Saros Bay (northern Aegean Sea, Turkey)

100%

Cengiz O., Ismen A., Ozekinci U.

Acta Ichthyologica et Piscatoria

2014

tom 44

nr 2

Background. Understanding the reproduction of the spotted flounder, Citharus linguatula (Linnaeus, 1758), has been considered a major step toward understanding its population dynamics, especially, in the northern Aegean Sea. So, the presently reported study aimed to study the reproductive biology of C. linguatula and provided the first data of its fecundity. Materials and Methods. This study was carried out between September 2006 and September 2008 in Saros Bay (Northern Aegean Sea, Turkey), which had been closed to trawl fishing since 2000. The gonadosomatic index, length at maturity (L50), and absolute fecundity were analysed. Results. The elevated GSI values observed, suggested the spawning period was from September to November. The length at maturity (L50) was at 15.0 cm TL for females and 14.0 TL cm for males. The relations between the absolute fecundity and total length, total weight, and age of the spotted flounder females were estimated as Fa = 0.1878TL3.29, Fa = 58.515TW + 36.453, and Fa = 887.59A – 389.43, respectively. Conclusion. The identification of reproductive strategy is necessary to obtain a better understanding of its biology.

Ograniczanie wyników

2 Acta Ichthyologica et Piscatoria

2 Ismen A.

1 Arslan M.

1 Cengiz O.

1 Gul G.

1 Ozekinci U.

2 2014

Wyniki wyszukiwania

Age, growth, and reproduction of Dentex maroccanus (Actinopterygii: Perciformes: Sparidae) in the saros bay (North Aegean Sea)

Reproductive biology of the spotted flounder, Citharus linguatula (Actinopterygii: Pleuronectiformes: Citharidae), from Saros Bay (northern Aegean Sea, Turkey)