Researching the Place of Fisheries Industry and General State of the Sprat (Sprattus Sprattus Phalericus Risso, 1826) Fishing Middle Black Sea Region

Abstract

In this study, stock structure and fisheries industry of the sprat (Sprattus sprattus phalericus RISSO, 1826) were investigate in the middle Turkish Black Sea cost in 2004-2005 fishing season. Total 4038 individual fish were investigated. The percentage of females and males was 59% and 41% the sex ratio was not significant (P>0.05). The minimum and maximum lengths were 5.2 cm and 12.5 cm, weight were 0.96 g and 11.81 g, respectively. Condition factor was maximum in January (0.620 +/- 0.0691) and minimum in February (0.552 +/- 0.0016). It was determined that the eggs can be seen by visual observation in gonads between November and February. Reproduction was conducted between November-March. The length-weight relationship was W=0.0062 L-3.0938 (r=0.98). Age was I-IV. year with mean lengths of 6.99 +/- 0.478 cm, 8.72 +/- 0.350cm, 10.03 +/- 0.266, 11.02 +/- 0.299 cm were obtained. II. age group was dominant. Von Bertalanffy growth function, pooled, female and male was L-t= 14.10[1-e(-0.279(t+ 1.455))], L-t= 13.15[1-e(-0.334(t+ 1.333))] and L-t= 14.34[1-e-(0.293(t+ 1.276))], respectively. It was determined that only one fish meal and oil plant produced between November and May except from March. Total 31 fishing boats gave to fish in this factory to processed and total 16.484 tons fish processed in this season. The percentage of processing fish was 30% sprat. In fishing season total 2.529 tons fish meal and 1.416 tons fish oil were produced. Mean fish meal and oil ratio were 15.01% and 8.41%, respectively.