Bio-ecological features and parameters of population dynamics of the deep-water rose shrimp (Parapenaeus longirostris Lucas, 1846) from the Babadillimani bight (Silifke-Mersin)

This study was carried out in the waters of 0-50m, 50-100m and >100m of depths in Babadillimani Bight between May 1999 and April 2000 through monthly deep trawls applications. Mean CPUE of total 36 deep-trawls was 68.600 ? 61.889kg/h, and mean CPUE of the deep-water rose shrimps,was 5.480 ? 5.463kg/h, which consists of 8% of the total catching. After the measurements and calculations of 3886 deep-water rose shrimps, it was determined that male/female ratio was 1:3, and length at first maturity lengths was 18.2mm and (%CL50) value was 14.53mm. It was also determined that female individuals had developed eggs in the period between November and June, and reproduced intensively two times a year: between December and March, and between April and June. The diameter of ripe eggs varied from 0.54mm to 0.60mm, and average fecundity was 49126.52 ? 25523.86.There was a linear relationship between carapace length and total length in males and females (CL==-0.2257+0.2243*TL; R2=0.9216, n=923 for males, CL=0.222*TL; R2=0.9649, n=2859 for females) and CL=0.2223*CL; R2=0,9652, n=3886 for total individuals. As to equation of relationship between carapace length and weight, it was W=0.0015*CL2.6252 for males, W=0.0009*CL2.8190 for males, and W=0.001*CL2.7954 for total individuals. The von Bertalanffy growth constants in length was CL ? =31.20mm, K=0.76/year, t0=-0.386 year, C=0.65, WP=0.65 for males; CL ? =32.30mm, K=0.77 year?1, t0=-0.387 year, C=0.80, WP=0.57 for females; and CL ? =32.10mm, K=0.76 year-1, t0=-0.394 year, C=0.60 and WP=0.65 for total individuals including juveniles as well as sexually maturated ones. In the study, for all the individuals of the species, the total (Z), natural (M) and fishing (F) mortality coefficient and exploitation rates (E) were determined as 4.00, 1.29, 2.71 and E=0.67 year-1, respectively.