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Öğe Appearent digestibility of plant protein based diets by European sea bass Dicentrarchus labrax L., 1758 [Bitkisel protein İçerikli levrek (Dicentrarchus labrax L., 1758) Yemlerinin Görünür sindirilebilirligi](2011) Altan O.; Korkut A.Y.Commercial culture of carnivorous fish demands the reduction of environmental impact of feeds; that requires minimal use of dietary animal protein. This study investigated the digestibility of diets formulated exclusively out of plant protein, added rendered ingredients and feed attractants, by the carnivore European sea bass, Dicentrarchus labrax. Juvenile European sea bass (14.0±1.0 cm) conditioned to accept artificial dry feed were stocked in polypropylene cages and fed ad libitum in three daily meals, seven experimental diets containing varying levels of vegetable and animal protein sources, added of different feed stimulants. After last daily meal, cages were transferred to cylindrical-conical-bottomed, 200 L aquaria, where faeces were collected by sedimentation into refrigerated containers, preserved and later analysed for chemical composition. Soybean meal can be used as partial substitute of animal protein in diets for European sea bass; the poultry by-product meal shows as a good option as animal protein source in these rations. Control treatment -50PP:50AP- yielded best performances; the requirement for the use of fish meal in the formulation for carnivorous diets is, at least, questionable. Results of the digestibility trials demonstrated the importance of determining the diet digestibility, if precision in the formulation of least-cost feeds for carnivorous fish is the ultimate goal. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey in cooperation with Japan International Cooperation Agency (JICA), Japan.Öğe Determination of the bioenergy production capacity from biochemical profiles of some aquatic phytoremediation plants. Energy while cleaning(Scibulcom Ltd., 2014) Gunes A.; Cakar H.; Akat O.; Guney M.A.; Ozkul B.; Koru E.; Korkut A.Y.; Suzer C.; Cirik S.; Firat K.; Saka S.This study aims to research the possibilities of converting some hydrophytes into energy by revaluating them after the harvesting process. These hydrophytes used in the phytoremediation studies disperse naturally in aquatic mediums, sometimes even revealing themselves as invasive species. Chosen hydrophytes samples (Eichornia crassipes, Cyperus alternifolius, Lemna minor, Pistia stratiotes, Typha latifolia, Nasturtium officinale, Houttonia cordata) are analysed in terms of oil rate, biochemical profiles which include elaeostearic compositions, COI/T.20/Doc No 17 (capillary column gas chromatography) and in-house methods. The obtained data are analysed in comparison to the elaeostearics rate and compositions of the plants used in biodiesel procurement (canola, soy, palm, sunflower, Botryococcus and Chlorella oils). As a result, it is found that linolenic acid and linoleic acid percentages especially stand forth in the plants Eichornia sp., Cyperus sp., Lemna sp., the stearic and oleic acid percentages are significantly high in Pistia sp., and palmitic elaeostearic percentage is higher in the plants of Houttonia sp. and Nasturtium sp. than the plants currently used in biodiesel procurement, yet the oil rate within their system is lower than these plants. Moreover, it is thought that the plant waste obtained after the harvest carried out in order to ensure the water quality of the systems may in the least meet this deficit.Öğe The effect of dietary lipid on the growth performance of Meagre (Argyrosomus regius Asso, 1801)(Israeli Journal of Aquaculture - Bamidgeh, 2016) Korkut A.Y.; Sert S.C.; Kop A.; Gamsız K.; Karahan B.The aim of the study was to investigate the effects of dietary lipid on the growth and feed utilization of Meagre (Argyrosomus regius Asso, 1801), taking into account their feeding behavior of collecting food from the bottom of the cages. The fish (141.07±0.5g, average weight ± SD; 22.18±0.53 cm, average total length± SD) were fed three isonitrogenous experimental diets (45% crude protein, dry matter) containing 16% (group A), 18% (group B), and 20% (group C) crude lipids for 570 days. The fish were stocked into 9 net cages (16 m diameter; 7 m deep) at a density of 16000 fish per cage with 2 replications. At the end of the experiment fish in the A, B, and C groups reached 1054.59±5.9, 1026.32±4.3, 955.31±2.3 mean live weight (g) and 45.78±1.6, 44.43±1.4, 43.88±1.4 mean total length (cm) respectively. FCR and CF values were 1.99, 2.07, 2.14 and 1.999, 1.131, 1.170 respectively for each group, at the end of the study. VSI, HIS, and GSI values were also calculated. Growth rate in fish from group A (fed the lowest lipid diet) was superior to the other dietary groups. Cross sections of their liver were checked and were found to have less lipidosis. © 2016, Israeli Journal of Aquaculture - Bamidgeh. All rights reserved.Öğe Effect of some morphometric characteristics on egg quality in common dentex, Dentex dentex (Linnaeus, 1758) [Sinarit'lerde, Dentex dentex, yumurta kalitesi üzerine bazi morfometrik karakterlerin etkisi](2011) Çoban D.; Okan Kamaci H.; Süzer C.; Yildirim Ş.; Arda G.; Korkut A.Y.; Saka S.; Firat K.In this study, egg quality determination of common dentex (Dentex dentex) was investigated by using egg, yolk and oil globule diameter, from the first division to the hatching during natural and photoperiodic manipulation of spawning time. In the viable, floating eggs, the minimal and maximal diameter of the egg, yolk and oil globule were measured. Based on these measurements several parameters were calculated describing the shape of the egg, yolk and oil globule and the size relationship between these compartments. Hatching rate was calculated as 92% in natural spawning time (NST) and 64% photoperiodic manipulation of spawning time (PMST). Also, average egg diameter was measured as 0.949±0.038 mm in NST and 0.911±0.014 mm in PMST. In NST, egg diameter and yolk diameter of the eggs were significantly bigger than eggs in PMST (P<0.05). The morphometric parameters of oil globule could be accepted as an indicator for description of quality criteria of eggs. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.Öğe Effects of diets with different fish meal origins on the performance of rainbow trout Oncorhynchus mykiss (Walbaum)(2010) Kop A.; Korkut A.Y.The aim of this trial was to compare the performance of rainbow trout fed diets with different fish meal origin as the main protein sources. The growth trial lasted for 12 weeks and carried out in floating cages (5×5×5 m)j with triplicate groups of 10,500 rainbow trout of an initial average weight of 40±1.2 g. The experimental diets were formulated to be isonitrogenous and isoenergetic and to include imported (Peru) fish meal (Diet A), locally produced fish meal from Anchovy (Diet B) and locally produced fish meal from several fish species (gilthead sea bream, sea bass and rainbow tout) by-products (Diet C). At the end of the trial, there were no significant differences in the growth rate and protein efficiency ratio among groups (p>0.05). Feed conversion ratios were significantly better in groups fed Diets B. It was concluded that, performance of rainbow trout fed practical diets including good quality local processed fish meal are similar to that of fish fed diets including imported fish meal. © Medwell Journals, 2010.Öğe A New Grey Mullet Species "Mugil so-iuy Basilewsky" (Teleostei: Mugilidae) from the Aegean Coast of Turkey(1998) Kaya M.; Mater S.; Korkut A.Y.Mugil so-iuy is a freshwater fish living in Amu Darya River Basin, Far East Asia. It was first introduced to the area around the Sea of Azov for fish farming but, then migrated to the Black Sea, and from there to the Sea of Marmara. The present study is the first report from the Aegean Sea. Morphometrical and meristic characteristics of the two specimens caught are described.Öğe Soybean meal and rendered animal protein ingredients replace fishmeal in practical diets for sea bass(2010) Altan O.; Gamsiz K.; Korkut A.Y.A 180-day feeding trial was carried out in net cages to examine replacement of fishmeal with soybean meal supported by meat/bone meal and blood meal in practical diets for sea bass (Dicentrarchus labrax L. 1758). Triplicate groups of fish (initial body weight 110 g) were fed one of four isonitrogeneus (crude protein 46%) and isolipidic (10%) diets. A commercial sea bass diet containing 64% fishmeal as the sole animal protein served as the control. The other three diets contained 0, 20%, or 35% fishmeal and the reduced fishmeal was replaced by different levels of soybean meal, meat/bone meal, and blood meal. The final body weight of fish fed the diet containing 20% fishmeal, 50% soybean meal, 10% meat/bone meal, and 4% blood meal was significantly higher than that of the other three treatments. Results indicate that fishmeal can be reduced to 20% when soybean meal, meat/bone meal, and blood meal are used together in the diet.
