Fisheries
Habibollah Sadeghi; Arash Shakouri; Mohammad Mohammadi
Abstract
This study aimed to investigate the diet of Pharaoh cuttlefish (Sepia pharaonis) caught by pot during the sampling seasons in the Konarak fishing ground located in the Sistan and Baluchestan province. Tiger squid samples were collected for biological studies in the period from October to January 2021. ...
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This study aimed to investigate the diet of Pharaoh cuttlefish (Sepia pharaonis) caught by pot during the sampling seasons in the Konarak fishing ground located in the Sistan and Baluchestan province. Tiger squid samples were collected for biological studies in the period from October to January 2021. Based on the obtained data, the highest number was recorded in January (113 specimens), and the highest ranges of length (18.2-2.41 cm) and weight (426.17-17.3886 grams) were recorded in October. Based on the results of non-linear regression between length and weight, the values of a, b, and R2 parameters were 0.17038, 2.6962, and 0.9842, respectively. The highest Fulton index was obtained in December (0.93) and the lowest index was obtained in October (0.64). The highest value of the GaSI index was observed in December (1.02) and the lowest value was observed in November (0.7). Also, the highest SFI index was observed in January (0.535) and the lowest in November (0.31). The changes in the ESR index also showed that this index was 68% in October, 57% in November, 34% in December, and 41% in January. Based on the results of gastric dilatation, the highest state of the empty stomach (53%) and three-quarter dilation (13%) were observed in October. Also, most one-quarter dilation (18%), one-half dilation (24%), and full stomach (22%) were observed in January. The results showed that there is a significant relationship between the nutritional status of Pharaoh Cuttlefish caught by fishing trap in the Konarak in different sampling (P<0.05). Also, they have a varied diet (Fish, crustaceans, mollusks, and other digested materials) during different sampling months.
Meysam Golzar; Tooraj Valinasab; Mehrdad Shirin Abadi; Mahmood Hafeziyeh
Volume 5, Issue 2 , December 2016, , Pages 25-33
Abstract
The various stages of embryonic growth pharaoh´s cuttlefish (Sepia pharaonis) reside in Oman until hatching was studied. Gregor tours and the eggs collected for further study of the propagation of Education, Research Center of the Earth - Chabahar Moved .once every 24 hours to get detailed information ...
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The various stages of embryonic growth pharaoh´s cuttlefish (Sepia pharaonis) reside in Oman until hatching was studied. Gregor tours and the eggs collected for further study of the propagation of Education, Research Center of the Earth - Chabahar Moved .once every 24 hours to get detailed information was sampling of from fertilized eggs. Egg size of 11±4 mm were selected because of the large size of cuttlefish eggs during incubation stages of embryonic development within the capsule is visible. The studies showed that the water temperature of 20±2°C hatching takes about 20±10 days. In this study results showed that the first cleavage was performed on the first day and the 15th day after the yolk sac has started to decrease. Tentacle is visible on day 14. Cuttlefish in all developmental stages of the embryonic development of a model to follow, but the temperature plays an important role in hatching time.
