The prawn Penueus kerafhurus completes its life cycle in Amvrakikos Gulf. The reasons for not entering the open sea depend on the status of biotic and abiotic factors of the gulf. The migratory movements of the species in the gulf are described by a simple square model, in each corner of which, the wintering, spawning, nursery, and recruitment area exist. The wintering area is located below the 25m isobath and wintering period lasts from late December to late March. Spermatophores on females are observed throughout the year but the highest percentages between April and August. The spawning season begins late in spring and continues through the summer. The spawning area is located below the 10m isobath, mainly around 25m. The nursery area of Penaeus keruthurus is in shallow waters near river estuaries, and the temporal limits were determined to be between mid-summer and mid-autumn. Finally, the recruitment area is located near the nursery area, with recruitment taking place in autumn, while the major stock renewal is restricted to winter.
ProblemThe term migration in the biological sense refers to the periodic movements of animals away from a region and their subsequent return to the same region.The ethology of migration can be determined by a combination of interspecific and environmental factors. These causative factors include a greater distributional range, a more constant food supply, and a suitable reproductive environment.More specifically, since the migration of prawns is a seasonal phenomenon (JENSEN, 1958;LINDER & ANDERSON, 1956;CAMPILLO, 1979), changes in the environmentwhich are associated with the different seasonscan be assumed to play an important role. These changes can involve length of day, temperature, salinity, food availability, and even lunar periodicity. U. S.
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