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Introduction to biology of sharks and ray
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- 2. Liver Internal organs ofMustelus lenticulatus Spiral intestine
- 4. Liver (deep watershark: rich with oil)
- 6. Reproductive modes ofshark 1. Oviparous: Producing eggs that hatch after being ejected from the body of female parent 2. Viviparous Producing live young from within the body of the parent female Ovoviviporous :Producing eggs that hatch inside the uterus then give birth to the young (whale shark) 1. Shark Bony fish Internal fertilization
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- 9. Scar on femalebody (love bite before mating)
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- 12. Internal fertilization clasper cloaca Clasper (modified portionsof the pelvic fins in male sharks, rays and chimaeras used for transferring sperm to the female Cloaca (a common opening for digestive, urinary, and reproductive tracts in many fishes)
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- 17. Viviparity (Live-bearing sharks) Pregnantfemale of Centrophorus
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- 27. Whale shark; 350pups
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- 44. Egg cases ofoviparous shark Photo credit : Dr. Keiichi Sato Okinawa Churaumi Aquarium, Japan Swellshark Zebra shark bambooshark
- 48. The egg casegenerally has tendrils and sticky filaments that aide in attaching the egg to some sort of substrate where the eggs incubate.
- 56. Smoothnose wedgefish. Mode ofReproduction (Rays) Viviparous: Producing live young from within the body of the parent female
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- 62. • Liver: Sharkshave large livers that are particularly rich in oil. It is thought that this oil provides the animals with buoyancy, and helps to prevent them from sinking when they are stationary. Sharks which do not have air bladders are heavier than water. • Air bladder. Many bony fishes have air bladder in their body cavity. By adjusting the amount of gas it contains they are able to make their bodies weightless in the water. Other Information:
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- 64. Heart (very smallcompare with TL)
- 67. • Intestines: Sharkshave short, compact intestines which take the basic form of a spiral staircase arrange within a cylinder. This spiral valve-as it is known-varies in form from species to species • Bony fishes intestines vary in length according to the type of food that is eaten. Meat eaters generally have short intestines, and plant eaters long ones, sometimes elaborately folded
- 68. Spiral valve: Alopiassupersiliosus