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Notes: Cartilaginous Fish

Notes: Cartilaginous Fish. Rays and Skates. Bat Ray. Rays and Skates. General characteristics Dorso-ventrally flattened bodies Bottom dwellers are called demersal . Always have 5 pairs of gill slits Pectoral fins are flattened like wings Eyes on the top of the head (adult stage)

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Notes: Cartilaginous Fish

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  1. Notes: Cartilaginous Fish Rays and Skates Bat Ray

  2. Rays and Skates • General characteristics • Dorso-ventrally flattened bodies • Bottom dwellers are called demersal. • Always have 5 pairs of gill slits • Pectoral fins are flattened like wings • Eyes on the top of the head (adult stage) • Spiracles for breathing since gill slits on underside.

  3. Rays Giant River Ray – Thailand • Characteristics • Pelvic fin has one lobe • whip-like tails – stinging spines • Manta Ray – largest species -23 feet across, 40-50 lb babies. Give birth to live young. • When walking in water with stingrays you should shuffle your feet as you walk to flush them out – don’t run! • If stung – submerge foot in very hot water to break down toxins. • Electric Rays can deliver 200 volt shocks…enough to knock regulator out of mouth.

  4. Skate • Characteristics • no whip like tail • no stinging spines (use them in “petting tidepools in Aquariums) • The mother skate deposits egg cases, which have tendrils that anchor them to seaweed or rocks. The mother does not protect the egg cases during the 6-9 months that the skates develop in their cases. • Pelvic fins has two lobes • Have spines on their back.

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