Kas›m 2000 – Ekim 2001 tarihleri aras›nda yürütülen bu çal›flmada, Türkiye denizleri içerisinde en yayg›n olarak Marmara Denizi’nde bulunan Parapenaeus longirostris’in y›l boyu üreme dönemi, ilk efleysel olgunluk boyu, her efley için boy frekans da¤›l›m› ve boy/a¤›rl›k iliflkisi araflt›r›lm›flt›r. Yap›lan çal›flmalardan elde edilen bulgular›n de¤erlendirilmesi sonucunda; bu türün y›l›n hemen her ay›nda yumurtas› olgun ve çok olgun difli bireylerine rastlan›lm›fl olmakla birlikte, gonadosomatik indeks de¤erlerinin en yüksek oldu¤u aylar s›ras› ile Eylül, Ekim, Aral›k, Nisan ve May›s olarak bulunmufl, populasyondaki bireylerin % 50’sinin efleysel olgunlu¤a ulaflt›¤› total boy (TB) 9,7 cm olarak hesaplanm›flt›r. Yakalanan bireyler içerisinde en ço¤unu diflilerde 10 ve 11 cm, erkeklerde ise 9 ve 10 cm’lik boy gruplar› oluflturmufltur.

In this study, carried out between November 2000 and October 2001, the annual spawning period, first maturity length, length frequency distribution and length/weight relationship of Parapenaeus longirostris that inhabit most commonly the Sea of Marmara were investigated. Analysis of the data obtained from this study revealed that although the mature individuals with fully developed eggs were found almost every month throughout the year, the highest gonadosomatic index values were obtained in September, October, December, April and May. The total length at which 50% of the population reaches maturity is calculated to be 9.7 cm. Among the individuals caught, females at 10-11 cm and males at 9-10 cm formed the dominant size groups.