Shark and rays
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Sharks and rays are cartilaginous fish that share several features like having no swim bladder and multiple rows of teeth. While sharks have streamlined bodies and tails that aid swimming, rays have flattened disk-like bodies and long tails. They differ in reproduction, with sharks being oviparous and rays being ovoviviparous. Both predators eat fish and invertebrates. However, they face many threats like bycatch and habitat destruction. Overfishing has led to one-quarter of shark and ray species being threatened according to the IUCN, and improved conservation efforts are needed to prevent extinction.
Shark and rays
- 1. A PRESENTATION ON SHARK AND RAYS PRESENTED BY- Md. Nazmul Islam 1
- 2. Shark and Rays: The special types of fish which are cartilaginous that means their skeleton are made of cartilage. Common Features: No swim bladder. Rigid dorsal fin. Small placoid scales. Teeth's are in several series. Five to Seven pairs of gill slits. 2
- 3. Differences Between- Shark Ray 1.Most sharks have streamlined body. 1. flattened, disk like body. 2.The tail of shark is small. 2.The tail of rays is generally long. 3.Swim by creating a wave and starts at head then ripples down rest of body. 3.Swim by moving fins up and down. 4.Oviparous. 4.Ovoviviparous. 5.Example:Hammerhead shark. 5.Manta rays. 3
- 4. Distribution: Tropical and temperate seas, as well as some cold and polar seas and freshwater lakes. Habitat: shark-Usually found in pelagic surface. Rays-Usually found in demersal areas. https://www.google.com/search?rlz=1C1CHZL_enBD809BD809&biw=1350& bih=640&tbm=isch&sa=1&ei=8f65W6q_H8f- vgSo5JqgAg&q=shark+and+rays&oq=l=img.3..35i39k1l2j0.1650940.166042 9.0.1660972.43.22.0.0.0.0.304.2981.0j16j1j1.18shark+and+rays&gs_.0....0... 1c.1.64.img..28.14.2155.0..0i67k1.0.BGBv353TFqY#imgrc=PwWDgpKVVX5 6bM: 4
- 5. Diet: Shark-They can eat fish,crustaceans,mollusks, plankton, marine mammals, krill and other sharks. Rays- They can eat bundles of sea worms , shrimp and clam, eat soft shelled animals. https://www.google.com/search?rlz=1C1CHZL_enBD809B D809&biw=1350&bih=640&tbm=isch&sa=1&ei=eAW6W9 CKNsyy9QO32bugAg&q=diet+of+shark+and+rays&oq=die t+of+shark+and+rays&gs_l=img.12..35i39k1.272612.2762 43.0.278387.8.8.0.0.0.0.170.1147.0j8.8.0....0...1c.1.64.img ..0.2.324...0i8i7i30k1.0.eHaEm- w0Dm4#imgrc=Qw5uZyIjpc2rhM: https://www.google.com/search?rlz=1C1CHZL_enBD809BD809&biw=1350 &bih=640&tbm=isch&sa=1&ei=eAW6W9CKNsyy9QO32bugAg&q=diet+of+ shark+and+rays&oq=diet+of+shark+and+rays&gs_l=img.12..35i39k1.2726 12.276243.0.278387.8.8.0.0.0.0.170.1147.0j8.8.0....0...1c.1.64.img..0.2.32 4...0i8i7i30k1.0.eHaEm-w0Dm4#imgrc=C8-OPFoZz5MReM: 5
- 6. Reproduction: Claspers are modified inner edges of the pelvic fins of male shark and rays. https://www.google.com/search?rlz=1C1CHZL_enBD809BD809&biw=1350&bih=640&tbm=isch&sa=1&ei=kAa6W- TnH4eFvQSKq4wg&q=clasper+organ+of+male+shark&oq=clasper+organ+of+male+shark&gs_l=img.3...469090.487187.0. 487781.49.31.0.3.3.0.304.4460.0j15j7j1.23.0....0...1c.1.64.img..24.14.2039.0..0j35i39k1j0i67k1j0i5i30k1j0i8i30k1j0i24k1.0. W11GNtgSLiQ#imgdii=-XeDP0M2txuPZM:&imgrc=nTfTb8X2exvxtM: 6
- 7. Regulating the quality and health of other species of fish and invertebrates that helps to keep the ecosystem balance. https://www.google.com/search?rlz=1C1CHZL_enBD809BD809&biw=1350 &bih=640&tbm=isch&sa=1&ei=8f65W6q_H8f- vgSo5JqgAg&q=shark+and+rays&oq=shark+and+rays&gs_l=img.3..35i39k 1l2j0.1650940.1660429.0.1660972.43.22.0.0.0.0.304.2981.0j16j1j1.18.0.... 0...1c.1.64.img..28.14.2155.0..0i67k1.0.BGBv353TFqY#imgrc=8TbrCYweu 6MsgM: Economically:Fishing,tourism,Herbal medicine ,food. Importance: 7
- 8. By –catch. Habitat destruction. Climate Change. Marine debris. Unregulated tourism. Threats: https://www.google.com/search?rlz=1C1CHZL_enBD809BD809&biw=1350 &bih=591&tbm=isch&sa=1&ei=rwu6W- f3G8TXvgT4_L7IAQ&q=threats+of+shark+by+nets&oq=threats+of+shark+ by+nets&gs_l=img.3...159437.175333.0.175928.15.11.0.0.0.0.297.2183.0j 1j8.9.0....0...1c.1.64.img..6.1.272...35i39k1.0.EFytTYdLqoM#imgrc=npMP_ IS9IoY2VM: https://www.google.com/search?rlz=1C1CHZL_enBD809BD809&biw=1 350&bih=591&tbm=isch&sa=1&ei=Cw26W- auMZOOvQTj8ZKQBg&q=threats+of+ray&oq=threats+of+ray&gs_l=im g.3..35i39k1l2.37622.41391.0.42820.23.10.0.0.0.0.337.1296.0j1j3j1.5.0 ....0...1c.1.64.img..19.3.869...0i24k1.0.SoxSa- NIo1U#imgrc=8xogbvsHBpEv4M: 8
- 9. Improved management is needed to avoid extinction and promote population recovery. Overall chondrichthyan extinction risk is substantially higher than for most other vertebrates. One –quarter are threatened according to IUCN Red list criteria due to Overfishing Conservation Status: 9