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    Effects of dietary natural zeolite levels on ammonia excretion rates in young rainbow trouts (Oncorhychus mykiss)
    (Parlar Scientific Publications (P S P), 2008) Erguen, Sebahattin; Tekesoglu, Haluk; Yigit, Murat
    The possible effects of dietary zeolite levels on the ammonia excretion rate of young rainbow trouts (Oncorhychus mykiss) were investigated. Triplicate groups of rainbow trout were fed diets incorporated with three different levels of zeolite (0.5%, 1% and 2.5%), and a control diet without zeolite at a constant water temperature of 17 degrees C. A decline in ammonia excretion level has been recorded with increasing dietary zeolite level. Cumulative ammonia excretion rates for a period of 6 hours, resulted in 6.09 mg N/100g fish for the control group (0% zeolite), while an excretion rate of 4.64 mg N/100 g fish has been recorded in fish fed the diet with the highest zeolite level of 2.5%. Based on the findings in the present study, the inclusion of 2.5% natural zeolite in the diet reduced the ammonia excretion rate of rainbow trouts by 24% compared to the control group. This finding could be useful for environmental impact assessment and trout culture management.
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    Growth performance of bath sponge (Spongia officinalis Linnaeus, 1759) farmed on suspended ropes in the Dardanelles (Turkey)
    (Wiley, 2011) Celik, Ihsan; Cirik, Sukran; Altinagac, Ugur; Ayaz, Adnan; Celik, Pinar; Tekesoglu, Haluk; Yilmaz, Harun
    Commercial bath sponge population in the Mediterranean has been recently reduced due to diseases and the depletion of natural banks. The commercial supply is far below the demand on the last 1015 years. In this study, we aimed to investigate the farming performance of Spongia officinalis in the Dardanelles. Sponges collected from the Dardanelles cut into pieces of different weight. They were divided into two groups depending on the wet weight ranging from 50 to 150 g (mean weight 102.6 +/- 4.81 g) and from 160 to 360 g (mean weight 235.8 +/- 8.56 g). Three rope systems located parallel to each other with 67 m inter-distance were constructed for the cultivation of sponges. At the end of the study, while small-sized sponges could reach mean wet weight of 120.7 +/- 14.8 g, large-sized sponges reached mean wet weight of 247.6 +/- 22.4 g. Growth rates were estimated 517% at 21st month. The survival rates were found 82% and 88%.
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    Optimum Dietary Protein Level for Blue Streak Hap, Labidochromis caeruleus
    (Central Fisheries Research Inst, 2010) Ergün, Sebahattin; Guroy, Derya; Tekesoglu, Haluk; Guroy, Betul; Celik, Ihsan; Tekinay, A. Adem; Bulut, Musa
    An experiment was designed to determine the optimum dietary protein level of a freshwater ornamental fish, Blue streak hap (Labidochromis caeruleus). Four isocaloric fish meal based diets ranging from 30% to 45% in protein were fed to triplicate groups of Blue streak hap for 8 weeks. Fish (initial weight, 0.85 g) were reared in twelve 50 L aquarium with biological filter and controlled temperature (27.5 degrees C), in stocking density of ten fish/aquarium. Results showed that dietary protein level significantly influenced final weight, weight gain and specific growth rate of fish. Maximum growth of fish was observed in the 40% protein diet, although this was not significantly different from the 35% and 45% protein diets (P > 0.05). Specific growth rate and feed efficiency increased from 30% to 40% protein, and thereafter decreased for diet 45% protein. There were statistically significantly differences in feed intake among treatments (P < 0.05). Fish fed with the highest protein diet had lower percentage daily feed consumption values than those of fish fed with the lowest protein diet. Under the experimental conditions applied, juvenile blue streak hap, L. Caeruleus, appear to require more than 35% dietary protein for optimized growth.