No abstract

This study examined an offshore submerged mussel longline system, in the Black Sea, from May 2009 to May 2010. The system was allowed 1 year for spat collection. After a 1-year spat collection period, some spat collectors were left untouched (NS), and some spat collectors were grazed and socked (S) for a grow-out study in May 2009. The effects of stocking density on the growth and survival of the S and NS mussels were examined. The biochemical composition of the mussels was also determined. Environmental factors including temperature, salinity, chlorophyll a, total suspended matter, inorganic matter and organic matter were monitored monthly during the experimental period. In May 2010, the mean length and live weight of the S and NS mussels were 60.46 AE 0.60 mm and 53.34 AE 0.37 mm, respectively, and 20.50 AE 0.50 g and 13.11 AE 0.26 g respectively. Mean moisture and ash were 82.35 AE 0.47% and 6.67 AE 0.44% respectively. Mean carbohydrate, protein and lipid were 27.74 AE 2.40%, 57.68 AE 2.15% and 7.91 AE 0.68% respectively. These results indicate that a submerged offshore mussel culture system in the Black Sea can be commercially convenient. In addition, stock management via thinning out of the spat can considerably increase the marketable size of mussels, reduce harvest time and produce better growth.

A study of spat settlement of a submerged longline mussel culture system was carried out in Sinop area, Black Sea, between May 2008 and May 2009. The effects of six different types of collectors on spat settlement and growth were investigated. Six different types of spat settlement rope were used as polypropylene ropes with 18 mm diameter, 18 mm diameter timeworn silk rope, 22 mm diameter rope made from old hawser (OSR), 22 mm diameter ropes made from old anchovy net without pegs, 18 mm diameter old used nylon ropes and 18 mm diameter tasselled polypropylene ropes. Monthly temperature, salinity, chlorophyll‐a, total suspended matter, inorganic matter and organic matter were determined during the experimental period. The best settlement was observed on the OSR type when measured per metre (3450.00 ± 125.83 ind m−1). Consequently, the findings showed that settlement preference of spat occurred according to rope structure, and if ropes are designed to combine numerous well‐fixed tassels, spat settlement can increase. Spat growth was affected by environmental factors and rope structure. In addition, the study revealed a negative relationship between density and growth.

The aim of this study was to determine the growth performance, meat quality and colour attributes of large rainbow trout (Oncorhynchus mykiss) in net cage systems in the southern Black Sea coasts of Turkey. In the study, large rainbow trout with an initial weight of 1,322.07 ± 57.72 g were reached to 3,385.30 ± 140.98 g and the survival rates were 95.69 ± 1.32% in 5-month production period. Crude protein and crude fat values of fish meat were ranged between 16.75 ± 0.07-20.18 ± 0.90% and 9.22 ± 0.15-12.29 ± 0.42%, respectively (p < .05). The essential and non-essential amino acid values were between 12.92 ± 0.02-13.09 ± 0.01 g/100 g and 11.97 ± 0.14-11.47 ± 0.01 g/100 g, respectively (p > .05). C20:5n-3, C22:6n-3, ɷ3 and ɷ6 values in fish meat were between 4.32 ± 0.02-4.30 ± 0.08% (p < .05), 8.31 ± 0.10-7.72 ± 0.15% (p < .05), 13.41 ± 0.10-12.93 ± 0.23% (p < .05) and 21.85 ± 0.06%-19.74 ± 0.36 (p < .05), respectively. As a result, it can be concluded that large rainbow trout cultured in the southern Black Sea coasts of Turkey is a rich source of food in terms of fatty and amino acid compositions and atherogenicity index, thrombogenicity index and hypocholesterolaemic/hypercholesterolaemic values. K E Y W O R D Samino acid, Black Sea, colour attributes, fatty acid, growth performance, Oncorhynchus mykiss 3764 | KAYA ÖZTÜRK eT Al.Fish meat quality, an important factor from an economic point of view, determines the price of fish and consumer acceptance.The consumer willingness for paying depends on the quality of the products such as texture and biochemical composition (such as protein and fat), and colour of fish meat is the major parameter that determines the satisfactoriness of the consumer (Haard, 1992;

This study examined survival, growth rate and biochemical composition of oysters (Ostrea edulis) when transplanted from Aegean Sea to southern Black Sea (Sinop) and maintained offshore in a submerged long‐line from December 2008 to December 2009. In December 2009, the mean length and live weight were 92.52 ± 1.40 mm and 109.60 ± 2.41 g respectively. Mean specific growth rate (SGR) was found as 1.29 ± 0.16%. Meat yield ranged from 7.90 to 11.47%. Mean moisture and ash were 81.40 ± 0.52% and 9.50 ± 0.55% respectively. Protein content was between 36.57% and 61.31% with a mean of 50.17 ± 2.13%, while lipid content was between 4.83% and 10.86% with a mean of 7.74 ± 0.49%. Carbohydrate content was between 20.88% and 46.89% with a mean of 32.59 ± 2.38%. The study demonstrated that protein, lipid and carbohydrate were used for different metabolic needs of oysters. Mortality was dependent on physiological stress related to the gonadal activity, temperature and inorganic matter in seawater. Consequently, the low salinity rate has a negative impact on growth rate of oyster. However, there was not a serious adaptation problem in transplanted oysters from Aegean Sea to Black Sea.