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Ephemeroporus barroisi, accepted as nomen dubium though there are many reports to date, is redescribed on the basis of parthenogenetic female, ephippial female and male collected from Mediterranean Anatolia, Turkey. It is decided that Anatolian specimens represent the species described by Richard. On the basis of nineteen diagnostic characters that were widely used in the description and diagnosis of the species in the previous studies, Ephemeroporus barroisi is the most similar first to E. epiaphantoii and next to E. margalefi. It is concluded that the E. barroisi group can not be defined by a single outomorphy, but by the character combination of the presence of four labral teeth and that of the denticles on the posterior angle of valves. Finally, an account on the distribution of species from the E. barroisi group is presented and it has been postulated that the species of the E. barroisi group may have been derived from an ancestral stock that was present in the old Mediterranean.© Central Fisheries Research Institute (CFRI) Trabzon.

Kocer M.A.T.,Mediterranean Fisheries Research Production and Training Institute | Sen B.,Firat University
Turkish Journal of Botany | Year: 2012

Some physicochemical variables and climatic effects on the succession of a diatom community in the plankton of the pelagic zone of Lake Hazar, an alkaline soda lake, were investigated. Monthly diatom samples were collected from the surface water at western, central, and eastern pelagic areas of the ellipsoid-shaped lake using a plankton net from November 2004 to October 2005. When high temperature and pH levels prevailed in May and September, Epithemia, Rhopalodia, Cocconeis, and Cyclotella were dominant. Cymbella was dominant in early spring and late autumn, but was not significantly correlated with temperature or pH. The species of Gomphonema, Fragilaria, Navicula, and Nitzschia were dominant at low temperature and pH levels in winter. However, the diatom community of the surface phytoplankton in the lake comprised largely cosmopolitan and nonplanktonic species of Cocconeis, Cyclotella, Cymbella, Epithemia, Fragilaria, Gomphonema, and Rhopalodia detached from benthic habitats of littoral zone by wind-driven currents. © TÜBİTAK.

Length-weight relationships were estimated for 15 fish species sampled with combined gillnet and trammel net and fishing traps between December 2004 and December 2005 in the Beymelek Lagoon, Turkey (Mediterranean Sea). The values of the slope b in the length-weight relationship ranged between 2.188 and 3.131, with a mean of 2.753 ± 0.077. While isometric growth (Pauly's Mest, P > 0.05) was observed for 9 species, negative allometic growth (Pauly's Mest, P < 0.05) was observed for 6 species.

Sevgili H.,Production and Training Institute | Hossu B.,Ege University | Emre Y.,Production and Training Institute | Emre Y.,Mediterranean Fisheries Research Production and Training Institute | Kanyilmaz M.,Production and Training Institute
Aquaculture | Year: 2012

This study was conducted to determine the effects of various levels of dietary protein restriction for 3weeks (phase 1) on compensatory growth, nutrient utilization, body compositions and organ indices of rainbow trout (Oncorhynchus mykiss) during a nine-week realimentation phase (phase 2). Five experimental treatments consisted of four protein restricted diets including 15, 22.5, 30 and 37.5% protein (RP15, RP22.5, RP30 and RP37.5 respectively) and the control diet 45% (C45). All diets were prepared to be isoenergetic at levels of 22.5MJkg -1 gross or 16.3MJkg -1 digestible energy. Each of five treatment groups was tried in triplicate groups of 75 fish with an average initial weight of 62.06±0.38g. Protein restriction in phase 1 linearly decreased specific growth rates of weight and length (SGR W and SGR L), body weight and length as well as feed utilization. The restriction induced a linearly increasing trend in protein retention efficiency, feed intake, organ indices such as viscera, pyloric caecum and hepato-somatic, whole body lipid and lipid/lean body mass whereas it induced a decrease in whole body moisture and protein at the end of phase 1. Protein restriction, except RP37, caused a significant increase in SGR W during phase 2 compared with C45, being most pronounced in the first 3weeks. Repeated measures ANOVA revealed a convergence in trajectories of ln body weight and length at the end of the experiment, suggesting that a complete catch up occurred in body mass and structure. There was also replenishment in distorted organ indices and body compositions, except protein which was still less in R15 than C45. More efficient utilization of feed and dietary protein by previously protein restricted fish during phase 2 appears to be the reason of the compensatory growth. At the end of the experiment, protein restriction was found to be effective in reduction of N loss. © 2012 Elsevier B.V..

Aydin M.,Ordu University | Sevgili H.,Mediterranean Fisheries Research Production and Training Institute | Tufan B.,Karadeniz Technical University | Emre Y.,Mediterranean Fisheries Research Production and Training Institute | Kose S.,Karadeniz Technical University
International Journal of Food Science and Technology | Year: 2011

Proximate composition and fatty acid (FA) profile of three commercial sea cucumbers; Holothuria tubulosa, Holothuria polii and Holothuria mammata caught from Aegean Sea of Turkey were analysed. The effects of regional variation and drying process on FA composition were also investigated. Moisture, protein, fat and ash contents of the species ranged between 81.24% and 85.24%, 7.88% and 8.82%, 0.09% and 0.18%, and 5.13% and 7.85%, respectively, with a significant changes among species (P<0.05) with some exceptions. Although FA values varied significantly (P<0.05) among species and regions, the changes for most FA types representing the same region for different species were not significantly different. Total polyunsaturated fatty acids (PUFA) were found to be higher than total saturated (SFA) and monosaturated FAs (MUFA) accounting for 53.0-62.12% for ∑PUFA, 13.28-16.41% for ∑MUFA and 13.99-19.21% for ∑SFA. While some individual SFAs and PUFAs decreased after drying process, various individual FAs of MUFA increased in their amounts (P<0.05). Among PUFAs, the highest mean value of eicosapentaenoic acid and docosahexaenoic acid for all regions were determined for H. polii as 7.25% and H. tubulosa as 12.37% in fresh samples, respectively. This study represents new information relating to FA contents and drying effect on FA profile for these species. © 2011 The Authors. International Journal of Food Science and Technology.

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