Sepia Pharaonis (Ehrenberg, 1831)

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Sepia Pharaonis (Ehrenberg, 1831) Sepia pharaonis (Ehrenberg, 1831) Item Type other Authors Ketabi, Ramin; Jamili, Shahla Publisher Iranian Fisheries Science Research Institute Download date 26/09/2021 22:39:30 Link to Item http://hdl.handle.net/1834/35944 Sepia pharaonis (Ehrenberg, 1831) Kingdom: Animalia Family: Sepiidae Phylum: Mollusca Genus: Sepia Class: Cephalopoda Species: S. pharaonis Order: Sepiida The Sepia pharaonis (pharaoh cuttlefish) is a large cuttlefish species, growing to 80 cm in mantle length. Males are larger than females, the maximum recorded size for males is 80 cm and 5 kg, and for females 50 cm and 2 kg in weight (Iran, Persian Gulf, Kish Island). This cuttlefish lives in warm water (30°C) and is fast growing. They mate and spawn at 110 days and their life span is 240 days. They lay about 1500 eggs which take 14 days to develop at 28°C. Inhabiting the neritic zone, it is often found in depths up to 130 m. S. pharaonis prefer a medium to high Photography By: Ramin Ketabi amount of sunlight for den location during the day. Additionally, they Editor:Shahla Jamili (IFSRI) prefer mud substrata during the day, but during the night prefer sand or mud substrata equally. Pharaoh cuttlefish often show a solid color when resting on a solid color background, alternating from a pale white to all dark brown. Additionally, they can show a mottled white and brown color, with a center circle of brown. The mechanism for color is the same in the Pharaoh cuttlefish as it is in other cuttlefish. This color-changing function is produced by groups of red, yellow, brown, and black pigmented chromophores above a layer of reflective blue and green tinted iridophores and leucophores, with up to 200 of these specialized pigment cells per square millimeter. These sacs of color are controlled by rings of muscle around the sac. The cuttlefish expands and contracts these muscle rings in order to show different colors. Feeding: When hunting at night, the Pharaoh cuttlefish swims up to shallower depths to feed on small mollusks, crabs, shrimps, small fishes, octopuses, worms, and occasionally other cuttlefish. On the other hand, its predators are dolphins, sharks, big fishes, and birds. Distribution: The S. pharaonis is native to at least the western Indian Ocean, including the Red Sea and Persian Gulf..
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