Mediterranean Fisheries Research Production and Training Institute

Antalya, Turkey

Mediterranean Fisheries Research Production and Training Institute

Antalya, Turkey
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Bolat Y.,Suleyman Demirel University of Turkey | Tan D.,Mediterranean Fisheries Research Production and Training Institute
Iranian Journal of Fisheries Sciences | Year: 2017

Three mesh sizes of multiflament trammel nets (22 mm, 24 mm, and 26 mm) were used in Finike bay for red mullet (Mullus barbatus L., 1758). The sampling program was arranged during February to May 2012. Holt (1963) method was used for selectivity of trammel nets. Red mullet was the dominant species in 22 mm mesh size at 52.86%, followed by 25.7% with the 24 mm net and 21.43% with the 26 mm net. On the basis of the results of this study, optimal selectivity lengths of multiflament trammel nets estimated for red mullet were 18.58, 20.27, and 21.96 cm for 22, 24, and 26 mm mesh size, respectively. Thus, based on length at first maturity it has been stated that the trammel nets of 22, 24, and 26 mm mesh size do not cause over fishing of the red mullet population in Finike Bay.

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.

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..

Demir O.,Suleyman Demirel University of Turkey | Sarigoz S.,Mediterranean Fisheries Research Production and Training Institute
Turkish Journal of Fisheries and Aquatic Sciences | Year: 2016

The aim of this study was to develop a feeding program for early larval stage of goldfish (Carassius auratus) with an initial weight of 0.97-1.13 mg and total length of 5.77 - 6.05 mm. The study was conducted with totally 2340 larvae during 15 days, and included 13 groups with three replications. Four different feeding times (T1-4), three different dry (D1-3 "one commercial feed and two test") diets plus continuous live food were the treatments. Larval growth were checked on 8th day and at the end of the experiment. Dry diets were fed to larvae continuously (T1) or after 3 (T2), 5 (T3) and 7 (T4) days of rotifer feeding. Also, in the control group only rotifer (R) was fed for 15 days. Results were analyzed with the factorial analysis design (feeding times × diets) and compared using the Tukey multiple comparison test. A comparison of the control group R with subgroups were also made using the Dunnett’s test. The present results indicate that various combinations of "live and dry foods" administered at different durations significantly effected growth and survival rates of goldfish larvae (P<0.05). Briefly, continuous feeding with all dry diets were not as successful as the others. As the duration of rotifer feeding as first food increased, larval growth and survival also increased even if still worse than the control (15 days rotifer). The best practice for early larval feeding of goldfish could be T4D1-2-3 (7 days rotifer, 3 days rotifer + dry diet and 5 days dry diet) during the first 15 after hatching. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.

Sevgili H.,Mediterranean Fisheries Research Production and Training Institute | Emre Y.,Mediterranean Fisheries Research Production and Training Institute | Dal I.,Mediterranean Fisheries Research Production and Training Institute
Israeli Journal of Aquaculture - Bamidgeh | Year: 2011

Hazelnut meal was evaluated as an alternative protein source to fishmeal in diets for mirror carp, Cyprinus carpio (mean initial weight 18.24±0.08 g). Hazelnut meal was incorporated into diets at levels of 0 (control), 10%, 20%, 30%, or 40%. Diets were tested in triplicate for 12 weeks. Hazelnut meal beyond 10% significantly reduced growth performance in comparison to the control (p<0.05). Feed conversion and protein efficiency ratios were significantly lower in fish fed hazelnut meal higher than 20% (p<0.05). The feed intake, condition factor, and dress-out percentage were not affected by treatment but the viscero-somatic index significantly dropped in fish fed 40% hazelnut meal. High levels of hazelnut meal reduced body moisture and ash but increased lipid concentration. Apparent digestibility coefficients of dry matter and energy were lowest in the diet containing the highest level of hazelnut meal (p<0.05) but those of protein and lipid did not differ. Crude and digestible protein retention were significantly depressed at high hazelnut meal levels. Results suggest that up to 10% hazelnut meal can be incorporated in diets for young mirror carp without growth retardation.

Kocer M.A.T.,Mediterranean Fisheries Research Production and Training Institute | Sen B.,Firat University
Turkish Journal of Botany | Year: 2014

This study aimed to explain the seasonal and vertical distribution of phytoplankton in the pelagic zone of a deep alkaline lake that is characterized by low phytoplankton abundance. Phytoplankton and water samples were collected seasonally from 9 points and 7 depths between the surface and 20 m from December 2004 to September 2005. Planktolyngbya contorta was the dominant or subdominant species in all seasons and depths. The dominance of Gomphonema species was observed in December, but they were subdominant in September. Cyclotella meneghiniana was dominant at 20 m and subdominant in the upper depths during March, June, and September. Melosira sp. and Meridion circulare were the dominant taxa of the surface phytoplankton in March and June, respectively. A nonparametric test showed the prevalence of cyanobacteria and green algae at a depth of 10 m. Principal component analysis showed the effect of temperature, pH, dissolved solids, nitrate, and silica on the abundance and distribution of phytoplankton. The generalized linear model revealed that high pH and high dissolved solids content seemed to affect the abundance of phytoplankton via limiting nutrient availability. © TÜBİTAK.

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.

Kocer M.A.T.,Mediterranean Fisheries Research Production and Training Institute | Sevgili H.,Mediterranean Fisheries Research Production and Training Institute
Ecological Indicators | Year: 2014

This study aimed to check the effectiveness of water quality indices (WQIs) in the specific assessment of trout culture impacts on a stream water quality by selecting the parameters in various approaches. Water quality was monitored monthly for a period of 1 year in one reference point and four affected stream reaches in which discharges from intensive trout farms, and rural and agricultural activities were present. The objective WQI calculation using 24 parameters and the minimum WQI (WQImin) using dissolved oxygen, biochemical oxygen demand, total suspended solids, total phosphorus, ammonia nitrogen (NH4 +-N), and total nitrogen as major indicators in trout farm effluents could not distinguish the aquaculture-impacted stream reaches. However, WQImin calculation with NH4 +-N, total organic nitrogen (TON), soluble reactive phosphorus, and total organic phosphorus which were selected using the principal component analysis findings meaningfully classified the sampling points. Further reduction of parameters to NH4 +-N and TON in WQImin calculation achieved a similar successful classification of the sampling points. This study showed that WQImin calculated using NH4 +-N and TON is a useful and easily applicable methodology in the assessment of the impacts of trout farm effluents on the stream water quality. © 2013 Elsevier Ltd. All rights reserved.

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