Browsing by Author "Karadal, Onur"
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Item Bezelye protein konsantresinin granyöz (Argyrosomus regius) balıklarında büyüme performansı biyolojik parametreler vücut kompozisyonu ve amonyak boşaltımı üzerine etkileri.(Ege Journal of Fisheries and Aquatic Sciences, 2017) Güroy, Derya; Mantoğlu, Serhan; Karadal, OnurUsing of alternative plant/animal based (except fish meal) raw materials is one of the most important application for decreasing feed cost in finfish feeds. Meagre which is demanded from many countries because of its efficient meat quality and flovur and showed rapid growth under culture conditions is a potential species. A nutrition trial with meagre, Argyrosomus regius was undertaken to evaluate the effect of replacing dietary fishmeal (FM) protein with pea protein concentrate (PPC). A diet with FM as the main protein source was used for the control diet (FM). Four experimental diets were formulated to progressively replace 15% (PPC15), 30% (PPC30), 45% (PPC45) and 60% (PPC60) of FM protein. The study was carried out in 450-L fiberglass tanks connected to a closed recirculation system. Eighteen fish per tank were randomly distributed into 15 tanks with three replicates. The diets were tested in triplicate for 12 weeks. The specific growth rate (SGR) of fish fed diet PPC15 were not significantly different compared to fish fed the FM diet (P>0.05). Meagre fed FM, PPC15 and PPC30 had significantly lower FCR compared with fish fed PPC45 and PPC60 (P<0.05). Total ammonia-nitrogen (TAN) excretion increased with elevated dietary PPC inclusion. In conclusion, using 15% of pea protein concentrate in meagre feeds has been recommended.Item Effects of Dietary Spirulina (Arthrospira sp.) on Flesh Quality of Freshwater and Marine Fish(2018-11-12) Güroy, Derya; Karadal, Onur; Güroy, BetülItem Microalgae Species Used as Natural Pigment Sources on Skin Coloration of Various Aquarium Fishes(International Agriculture, Environment and Health Congress, 2018-11-12) Güroy, Derya; Karadal, Onur; Güroy, BetülSkin coloration is one of the most important marketing criteria in aquarium fish. Aquarists desire brilliant and vital colours on their fish. But the coloration of fish is very sensitive and is affected by many physical or chemical stressors. In adverse environmental conditions fish lose colour and some colour pigments cannot be synthesized by their bodies. Carotenoids are one of the non-synthesizable pigments in fish species and must be taken from the outside. Most of photosynthetic organism have various colour pigments in their natural structure, such as β-carotene, phycocyanin, astaxanthin and chlorophyll. Fish recover colour pigments when they fed with the algae species. These algae are used in aquaculture as a protein source for larvae of marine and freshwater fish and shellfish. Also, they are used as a pigment source in aquarium fish and invertebrates. In this study, effects and benefits of algae species on coloration of aquarium fishes were reviewed.