Birol Baki

Examination of the Fish Price Offered for Sale During 2012-2013 Fishing Season in Sinop, Turkey

The aim of the study was to determine the monthly price distribution of the offered fish species for sale within the scope of information received from the centers engaged in the sale of retail fish during 2012-2013 fishing season in Sinop, Turkey. The enterprises were grouped as I (the most), II (middle) and III (the least) according to the sales volume and fish species. Each group was represented by two different fish enterprise and so a total of six separate enterprises were determined by purpose sampling method. During the study, sale prices and fish species were obtained twice every month at the same time of day. It was determined that anchovy (Engraulis encrasicolus ponticus), horse mackerel (Trachurus trachurus), bluefish (Pomatomus saltatrix), atlantic bonito (Sarda sarda), twait shad (Alosa fallax nilotica), needlefish (Belone belone), mullet (Mugil cephalus), shi drum (Umbrina cirrosa), brown meagre (Sciana umbra), common two-banded seabream (Diplodus vulgaris), annular bream (Diplodus annularis), tub gurnard (Trigla lucerna), picarel (Maena smaris), turbot (Psetta maxima), red mullet (Mullus barbatus), whiting (Merlangus merlangus), scorpion fish (Scorpaena porcus), goby (Gobius niger) were offered for sale in fish markets. While the prices of higher economic valued fish species like anchovy, bluefish, atlantic bonito and turbot prices were different between the enterprises, the prices of horse mackerel, red mullet and whiting species were not different. When considering the fish prices based on years, the prices of horse mackerel, bluefish, atlantic bonito, red mullet and haddock during 2012-2013 years were close to the average price of 2008-2012 years and the prices of anchovy and turbot during 2012-2013 years were higher than the average price of 2008-2012 years in Sinop.

Environmental and Social Risks and Solution Criteria in Offshore Aquaculture Systems

Aquaculture is a sector that involves agricultural activities aiming to meet the increasing animal food demand, contribute to balanced and healthy diet and reduce the hunting pressure on natural fish stocks. In aquaculture activities in sea, producers who are aware of the major role of obtaining an ecological balance in production regard coast utilization and environmental management as a part of production. Therefore, determination of environmental factors in production activities is highly important for sustainable aquaculture. The present study aims to determine the environmental risks and solution criteria in offshore aquaculture systems in Turkish seas. Environmental and social risks in production are collected under the main headings comprising nutrient and waste load in water, feeding, overuse of antibiotics and chemicals, fish escape, diseases, working conditions and common areas; solution criteria are collected under the main headings comprising ecosystem, water management, feed properties, legal procedure, chemical use, field management and occupational health and safety.

Feeding Behavior and Adaptation to Culture Conditions in Black Sea Flounder (Platichthys flesus luscus)

Article history: Received 24 June 2016 Accepted 03 August 2016 Available online, ISSN: 2148-127X The aim of this study was to determine the growth parameters of European Flounder fry (Platichthys flesus luscus L. 1758) caught from the nature in different feeding methods in aquaculture conditions. The study was conducted between April and July 2011, and the fish were collected at the connection point of Sarıkum Lagoon with the Black Sea in Sinop Province using seines and large scoops. A total of 750 European Flounder with the average weight of 0.93±0.01 (0.71-1.21) g were stocked in 5 groups with 3 repetitions. The groups were organized according to the feeding protocols [G1:90 days Chironomid larvae (CL), G2:60 days CL+30 days CL+ granular feed (GY), G3:30 days CL+60 days CL+ GY, G4:90 days CL+GY, G5:90 days GY]. At the end of the study, the weights of the fish were determined as 10.83±0.51, 9.89±0.22, 6.33±0.21, 5.13±0.11, 3.81±0.09, respectively. It was found that feeding preferences of the fish had significant effects on weight gain, specific growth rate, feed conversion ratio and survival rate. European Flounder fry, as in their natural habitat, mostly preferred natural feed moving in the deep in the production site. It was determined that using live feed as the starter feed for the adaptation of European Flounder fry had a significant effect on growth parameters and survival rates.

Relationship of Broodstock Weight and Hatching Yield of III. Generation (F3) Black Sea Trout (Salmo trutta labrax Pallas, 1814)

Article history: Received 03 March 2015 Accepted 16 May 2015 Available online, ISSN: 2148-127X In this study, this was the aimed to determine the reproduction and hatching yields in different weight groups in hatchery origin rootstocks (F3) Black Sea trout (Salmo trutta labrax Pallas, 1814). In this study, the female fishes which produced from natural rootstock were used average weight 1437±134.6 g (Group I) 2737±210.2 g (Group II) and 3785±162.3 g (Group III). After the stripping process; according to the groups, were determined respectively eggs absolute fecundity (number of eggs/broodfish) is average 2353±205, 5361±506, 6603±491, relative fecundity (number of eggs/kg)) is average1687±166, 1968±194, 1744±114. The egg diameter (mm) 4.89±0.16, 5.28±0.07, 5.31±0.06 egg weight (mg) 77±6, 90±4, 96±3 groups I., II. and III. respectively was calculated. The fertilization ratio (%) 95.49±1.23, 96.49±1.14, 98.39±0.52, browse rate (%) 79.97±5.36, 84.20±5.23, 94.70±1.50, has been identified. The output rate (%) 60.57±7.86, 67.66±6.42, 84.83±3.09, the hatchery efficiency (%) 58.14±7.95, 69.77±6.25, 83.51±3.29 was found. relative fecundity average value 168±160, 1968±194, 1744±114.The existence of relationship among the weight of the brood-stock, absolute fecundity (0.0198, 0.0012, 0.3499), and relative egg fecundity (0.3415, 0.0494, 0.00) was tested by regression analysis and consequently the difference between groups were significant. This was determined that between fish weight and absolute fecundity relationship is weak directly proportional for each group, between fish weight and relative fecundity is weak inversely proportional in Group I and II, the Group III is weak for directly proportional.