BIOLOGY AND POPULATION DYNAMICS OF THE PICKAREL (SPICARA SMARIS, L.) ON THE CRETAN CONTINENTAL SHELF
Abstract
PICKAREL IS A MEDITERRANEAN, DEMERSAL, PROTOGYNOUS HERMAPHRODITE FISH. THE POPULATIONS OF PICKAREL ON THE AEGEAN SEA ARE RELATIVELY HOMOGENEOUS, ACCORDING TO THE ANALYSIS OF MORPHOMETRIC AND MERISTIC CHARACTERS. WE CAN DISCRIMINATE TWO MAIN POPULATION GROUPS (A: N. AEGEAN, B: S. AEGEAN). FROM OTOLITH AND SCALEEXAMINATION WE FOUND THAT MALE INDIVIDUALS LIVE UNTIL 7 YEARS AND FEMALE UNTIL 5. WE STUDIED AND WE DISCUSSED THE APPLICATION OF THE SEVERAL GROWTH MODELSAND THE CHANGES IN THE LENGTH-WEIGHT RELATIONSHIP. PICKAREL FEEDS MAINLY ON PELAGIC PREYS DURING NOCTURAL HOURS. REPRODUCTION TAKES PLACE DURING APRIL-MAY,ON SPECIFIC REPRODUCTION GROUNDS.FECUNDITY IS 8000 EGGS/FEMALE INDIVIDUAL. SEASONALITY IS CHARACTERISING THE GROWTH, THE FEEDING INTENSITY AND PREY COMPOSITION AND THE DISTRIBUTION OF PICKAREL ON SPECIFIC GROUNDS. A CONCISE DESCRIPTION OF THE BIOLOGICAL CYCLE AND OF THE MOVEMENTS CONCLUDED FOR DIFFERENT PICKAREL POPULATION GROUPS ARE GIVEN.
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