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The article offers information on the first record of the Jinga shrimp. It states that in the Levant Basin, eastern Mediterranean, nine species of alien penaeid prawns are found which include Marsupenaeusn japonicus, Metapenaeus monoceros, and Melicertus hathor. It notes that the mentioned specie of prawns are known from the Turkish coast. It discusses the characteristics and qualities of above mentioned prawns.

The size structure of the commercially important rose shrimp, Parapenaeus longirostris, was compared between populations in the Sea of Marmara and the Aegean Sea. The analysis was based on data collected during trawl selectivity surveys carried out in November and December 2006. Growth showed no similar pattern, and in additions differences were found in length frequency distribution, sex ratio, and recruitment pattern of the P. longirostris populations in these two areas. [ABSTRACT FROM AUTHOR]

Mortality and yield parameters of the rose shrimp, Parapenaeus longirostris were compared with length frequency data collected from the beam trawl fishery in the Sea of Marmara. Von Bertalanffy parameters were estimated as L∞ = 16.28 cm and K = 0.490 year-1. The rates of total (Z), natural (M), and fishing (F) mortalitiy were calculated as 2.83, 0.97, and 1.86 for a 32 mm PE (polyethylene) cod end. The Z and F rates for two other cod ends, 32 mm PA (polyamide) and 36 mm PA, were, respectively, 2.13 and 1.16, versus 1.57 and 0.60. A study on the relative yield per recruit shows that maximum yield can be obtained at an exploitation rate (E) of 0.53, 0.52, and 0.45, respectively, for 32 PE, 32 PA, and 36 PA cod ends, whereas the current E values are 0.65, 0.54, and 0.38. Consequently, 32 mm PE and PA cod ends cause overfishing pressure on the stock of P. longirostris. [ABSTRACT FROM AUTHOR]

Some biological aspects of Melicertus kerathurus, a shrimp of high commercial value, were studied in İzmir Bay from April 2004 to December 2004. A seasonal reproduction pattern was observed from April to September with a high percentage of mature females occurring between May and July, when water temperature was relatively high. During the study, a total of 1050 specimens was captured: 612 (58.3%) females and 438 (41.7%) males. The largest female and male were 22.7 cm and 17.0 cm, respectively. The minimum size attained at first maturity was estimated to be 3.9 cm carapace length (CL) and 14.1 cm total length (TL). Sexual differences related to the length-weight relationship were noted. The onset of sexual maturity for females was estimated to be CL50% = 4.6 cm and TL50% = 16.5 cm. [ABSTRACT FROM AUTHOR]