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Investigating and determining the feeding indices of Alepes djedaba (Fabricius, 1775) in Makkoran coastal waters
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Madat Balouch   , Seraj Bita * , Nazanin Ghorbani Ranjbari |
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Abstract: (972 Views) |
Investigating the ecology of fish feeding as a part of biological studies is necessary to understand its functional role in ecosystems. In the present study, the feeding indices of Alepes djedaba (Fabricius, 1775) were investigated seasonally to identify its feeding habits. For this purpose, totally 120 fish were collected from the three areas of Ramin, Haft Tir and Tis in Makkoran coast of Oman sea from fall 2020 to summer 2021. Fishes were first biopsied and then dissected and their stomach contents were examined. The average length and weight of the fish were 28.00±4.68 cm and 311.18±12.00 g, respectively. The relative length of the intestine and the stomach fullness and emptiness index showed that this fish was carnivorous and tendency to eats relatively little food. The highest number of empty stomachs was 80% and the lowest amount of gastrosomatic index was recorded in spring, which was significantly different from winter and summer (p<0.05). The highest feeding intensity was in summer (426.52±49.35) and the lowest in spring (99.85±19.00). The value of the condition factor is more than 0.5 in all seasons and the fish has a good condition in terms of obesity. According to the results of food preference and relative importance indexes, fishes were determined as the main food item and crustaceans as the secondary food item, so that Stolephorus sp fish were more important food item than other prey. In general, this species is carnivorous and tendency to eats relatively little food. Its diet is mainly from fish, especially Stolephorus sp. and it has suitable biological conditions in the coastal waters of Makkoran.
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| Keywords: Evaluation of feeding indices of Alepes djedaba in Makkoran coastal waters |
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Full-Text [PDF 1040 kb]
(260 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2023/03/12 | Accepted: 2024/09/15 | Published: 2024/10/21
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