The Israeli Journal of Aquaculture Bamidgeh 56(2), 2004, 126-130.

COMBINED EFFECTS OF TEMPERATURE AND SALINITY ON EGG HATCHING RATE AND INCUBATION TIME
OF PENAEUS SEMISULCATUS (DECAPODA: PENAEIDAE)


M. Aktas*

Faculty of Fisheries, Mustafa Kemal University, 31040 Serinyol, Hatay, Turkey

O.T. Eroldogan and M. Kumluo

Faculty of Fisheries, Cukurova University, 01330 Balcali, Adana, Turkey



(Received 16.9.03, Accepted 27.12.03)


Key words: hatching, Penaeus semisulcatus, salinity, temperature


Abstract


This study was undertaken to determine the combined effects of temperature and salinity on the incubation time and hatching rate of Penaeus semisulcatus eggs in controlled laboratory conditions. Fertilized eggs, from a female caught in nature and spawned in our laboratory, were stocked in 2-l round bottom glass flasks and received one of nine temperature (24, 28 and 32C) and salinity (30, 35 and 40 ppt) combinations. The eggs hatched in all treatments. The hatching rate increased as salinity increased and was highest at 24C. In terms of hatching rate, the best combinations in descending order were 24C at 40 ppt, 32C at 40 ppt and 28C at 40 ppt. However, the incubation time was longer at 24C (17.5 h) than at 28C (14.5 h) or 32C (11.5 h).

* Corresponding author. Tel.: +90-326-2455815, fax: +90-326-2455807; e-mail: maktas@mku.edu.tr
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