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Three species of Philometra [Nematoda, Philometridae] from marine fishes off Corsica, France

100%

Moravec F., Ternengo S., Levron C.

Acta Parasitologica

2006

tom 51

nr 2

Gravid or subgravid females of the following three species belonging to the nematode genus Philometra were collected from marine perciform fishes of the Bonifacio Strait Marine Reserve, Corsica, France: Philometra justinei sp. nov. (prevalence 1.5%, intensity 11) and Philometra sp. (prevalence 3%, intensity 2) from the abdominal cavity and gonads, respectively, of the striped red mullet Mullus surmuletus (Mullidae), and Philometra serranellicabrillae Janiszewska, 1949 (prevalence 27%, intensity 2–6) from the gonads of the comber Serranus cabrilla (Serranidae). The newly described species, P. justinei, is mainly characterized by the absence of an anterior bulbous inflation of the oesophagus, body length of the gravid female (196 mm), conspicuously large amphids, number and distribution of cephalic papillae, and the morphology of larvae. It is the second known species of Philometra parasitizing fishes of the family Mullidae and the ninth species of this genus reported from marine fishes of the Mediterranean region. P. serranellicabrillae, studied for the first time by SEM, is redescribed.

Growth characteristics and reproduction of comber, Serranus cabrilla (Actinopterygii, Perciformes, Serranidae), in the Aegean Sea

80%

Ilhan D., Akalin S., Tosunoglu Z., Ozaydin O.

Acta Ichthyologica et Piscatoria

2010

tom 40

nr 1

Background. Even though Serranus cabrilla has been a by-catch species in trawling operations, it is now becoming an economically important fish species on the Turkish Coast of Aegean Sea, because of its low market price. For an efficient fisheries management of the stocks it is important to know important biological parameters of the commercially exploited species. Therefore the aim of this study was to obtain necessary growth- and reproductive characteristics of comber representing the local population of this fish in the study area. Materials and Methods. Biological aspects of comber were examined based on a total of 1452 specimens collected from the Aegean Sea, during the period January 2005–December 2005. Age of fish was determined by otolith reading. Length–weight relation and the von Bertalanffy equation were used to evaluate the fish growth. Results. Annuli on otoliths indicated the presence of 6 age classes. The computed growth parameters were: L∞= 23.88 cm; k = 0.298 year–1 and t0= –1.577 year. The length–weight relations were calculated as:W= 0.0111 · L2.998 for sex combined. The growth performance index (Φ′) was 2.230. The fish mature sexually for the first time at a total length of 13.20 cm (L50). The spawning season of comber was from March to May, with a peak in April. Conclusion. The comber grows rapidly attaining almost 75% of its linear growth during the first two years of life and then the growth slows down. The growth coefficient, (k), indicates slow attainment of maximum size because of significantly correlated to temperature of sea water, leading to a considerable variability in the life span between areas.

Ograniczanie wyników

1 Acta Ichthyologica et Piscatoria

1 Acta Parasitologica

1 Akalin S.

1 Ilhan D.

1 Levron C.

1 Moravec F.

1 Ozaydin O.

1 Ternengo S.

1 Tosunoglu Z.

1 2010

1 2006

Wyniki wyszukiwania

Three species of Philometra [Nematoda, Philometridae] from marine fishes off Corsica, France

Growth characteristics and reproduction of comber, Serranus cabrilla (Actinopterygii, Perciformes, Serranidae), in the Aegean Sea