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IJMS Vol.32(3) [September 2003] >


Title: Diel feeding periodicity, gastric emptying, and estimated daily food consumption of whelk (Rapana venosa) in the south eastern Black Sea (Turkey) marine ecosystem
Authors: Seyhan, Kadir
Mazlum, Evren R.
Emiral, Hacer
Engin, Semih
Demirhan, Sefa
Keywords: Food consumption
eastern Black Sea
Rapana venosa
Issue Date: Sep-2003
Publisher: CSIR
Abstract: Gastric emptying, food consumption and feeding periodicity of Rapana venosa were investigated under laboratory conditions and in the field respectively. Gastric emptying was best described by an exponential function, that was independent of meal size and the range of animal size when rapana were fed on fresh mussel. The fresh mussel (0.92-2.19 g) was fully digested by an average of 47 g rapana within the 6-8 hours. No change in feeding intensity was detected over 24 hours suggesting that rapana feed continioussly. Using gastric emptying rates from the laboratory studies, the data obtained from the field was converted to the food consumption estimates and concluded that an average of 50 g rapana in the eastern Black Sea marine ecossystem consume 0.17-0.30 g. mussel in a day, meaning that rapana in the eastern Black Sea marine ecosystem may cause an important predatory impact on the mussel beds.
Page(s): 249-251
ISSN: 0379-5136
Source:IJMS Vol.32(3) [September 2003]

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