Seval Bahadir Koca

• DR
• Süleyman Demirel University

An experiment was conducted to evaluate effects on growth, body composition and nutrient digestibility of addition protease and phytase to soybean meal-based diet in rainbow trout. Seven soybean meal-based diets were prepared by adding protease, phytase and mixture of both enzymes at two different levels (1 and 2 g kg⁻¹) to a base diet without enzy...

The aim of this study was to screen potential probiotic bacteria against Aeromonas hydrophila and determine the effects of antagonistic bacteria and a commercial product containing lactic acid bacteria on the survival and growth of stage II Astacus leptodactylus juveniles. For this purpose, a total of 110 bacterial strains were isolated from adult,...

The some taxonomic characters of species in superfamily Hydrobioidea (Gastropoda: Prosobranchia) distrubuted in freshwater of Isparta. In this study, it has been given some anatomical characters of species in superfamily Hydrobioidea collected from the Isparta provinces and determined 4 species in the wreshwater habitat. Falsipyrgula pfeiferi Weber...

In this study, we investigated the effects of enzyme-producing probiotic bacteria isolated from the gastrointestinal tract of rainbow trout on the growth performance, feed conversion ratio, and digestive enzyme activity, of fry (Oncorhynchus mykiss). Three isolates (G8/2013, T7/2013 and U5/2013) of candidate bacteria elicited the highest protease,...

The experiment was conducted to investigate the effects of artemia enriched with lipid emulsions containing highly unsaturated fatty acids on growth and survival of juvenile freshwater crayfish Astacus leptodactylus. Juvenile crayfish were fed artemia enriched with commercial emulsions (red pepper and olio ω3) and un-enriched artemia (control). The...

This experiment was conducted to investigate the effects Daphnia magna enriched with lipid emulsions as an alternative to Artemia, on growth, survival rate, and fatty acid composition of freshwater crayfish (Astacus leptodactylus Esch. 1823). The four treatment groups were (a) unenriched Artemia (UEA), (b) unenriched D. magna (UED), (c) D. magna en...

A 12-week feeding trial was conducted with 87 g rainbow trout to evaluate the effects on growth performances, feed efficiency and nutrient digestibility of adding β-mannanase and α-galactosidase enzymes, solely or in combination. Seven diets were prepared by adding β-mannanase, α-galactosidase and mixed enzyme at two different levels (1 g/kg and 2...

1. The oomycete Aphanomyces astaci is generally considered a parasite specific to freshwater crayfish and it has become known as the crayfish plague pathogen. Old experimental work that reported transmission of crayfish plague to the Chinese mitten crab Eriocheir sinensis, and the ability of A. astaci to grow in non-decapod crustaceans, has never b...

As alternative to formalin, the antifungal effect of a plant product [Origanum onites L. (Lamiaceae) oil] was investigated for use in the artificial incubation of narrow-clawed crayfish (Astacus leptodactylus Eschscholtz) eggs. For this purpose, this study was conducted as two experiments. In experiment I, the eggs were artificially incubated for 4...

A 12 week feeding trial was conducted with rainbow trout Oncorhynchus mykiss, fry (3.98 ± 0.05 g, average initial weight) to determine the effects of supplemental exogenous enzymes on growth, digestibility, and body composition. Five diets were prepared adding pectinase, xylanase, cellulase enzymes, and a commercial enzyme complex, to diets contain...

In this study, the effects on growth, feed conversion ratio, body composition, survival rate and hepatosomatic indices of addition canola meal in different ratio (12%, 22%, 32% and 42%) instead of soybean meal to diet of carp fry (average weight 0.25±0.01 g) (Cyprinus carpio, L. 1758) were investigated. The diets of carp fry were formulated as ison...

New freshwater genera (Anadoludamnicola and Sivasi) of Hydrobiidae are described for new hydrobiid species (Anadoludamnicola gloeri and Sivasi bodoni) from material collected from provinces Sivas and Malatya (Turkey), using anatomical and morphological data. For now, Sivasi is known from a single locality, while we expect Anadoludamnicola will be f...

Many populations of the narrow-clawed crayfish Astacus leptodactylus in Turkey, including those inhabiting Lake Eğirdir, declined drastically in the mid-1980s due to introduction of crayfish plague Aphanomyces astaci. However, unlike many other localities, there has been some recovery in the A. leptodactylus population inhabiting this lake even tho...

A 12-week feeding trial was conducted with rainbow trout fry (initial weight of 1.57 +/- 0.01 g) to examine the effects of partial substitution of canola meal in prepared diets on growth, feed conversion ratio (FCR), nutrient digestibility, somatic indices, and survival rate. Five isonitrogenous (44% crude protein) and isocaloric (4000 kcal/kg dige...

Graecoanatolica Radoman, 1973 is a remarkable genus of Hydrobiidae, recognized with its disjunct distribution between Macedonia, Greece (Thessaly), and Turkey (Lakes Region). However, the current distribution of the genus is restricted to Turkey, as the 2 Balkan species have been declared extinct. In this study, a taxonomic revision of the Graecoan...

In this study, freshwater crab (Potamon potamios, Olivier 1804), economically unevaluated, was used to obtain chitin-chitosan. Chitin-chitosan was extracted with standardized modified chemical method. Chitosan was extracted with demineralization, deproteinization, decoloration (chitin) and deacetylation (chitosan). Grinded shell was obtained as 60%...

Bu denemede Karadeniz'de gökkuşağı alabalıkları (Oncorhynchus mykiss Walbaum, 1792) üzerinde iki farklı teknoloji (ekstrüde ve pelet yem teknolojisi) ile üretilmiş yemlerin balıkların gelişmeleri üzerine yaptıkları etkiler incelenmiştir. Denizde, dört kafeste yürütülen bu araştırmada, her bir kafese ortalama ağırlıkları 274 g civarında olan 100 ade...

In this study, effects of commercial extruder diet (CED), commercial flakes (CF), Daphnia magna (DM) and 50 % commercial flakes + 50 % daphnia (CFD) on feed conversion ratio, specific growth rate and survival rate of angel fish (average weight 0,73±0,02 g) (Pterophyllum scalare Lictenstein, 1823) were investigated. The experiment groups were fed fo...

This study re-evaluated the brackish and freshwater Prosobranch fauna list of Turkey. Furthermore, recent systematic changes and future studies to be performed were discussed. Theodoxus (Theodoxus) danubialis (C. PFEIFFER 1828). Th. (Th.) subthermalis (ISSEL 1865). Bythinella opaca (FRAUENFELD 1857). Pseudamnicola macrostoma (KÜSTER 1852). P. kotsc...

Aquaculture production has an impact on the environment as other agricultural activities. In every branch of production, the negative environmental pressure occurs with industrialization. On aquaculture, worrying impacts have been begun to observe in the environment. Therefore, eco-friendly production is required for sustainable aquaculture. Sustai...