CIRCULATION

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CIRCULATION

• COLD BLOODED Poikilothermic
• 2 CHAMBERED HEART
• RED SWIMMING MUSCLE IN TUNA AND PELAGIC SPECIES
• Warmer than body temp.
• Myoglobin
• Oxygen storage

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FOOD GETTING

• FILTER FEEDERS
• USE GILL RAKERS,
• examples Herring, Anchovies

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VARIOUS SPECIALIZED TEETH

• SHEEPHEAD crushing teeth
• QUEEN TRIGGER urchin eater
• Parrotfish Parrot-like beak, coral eater
• BARRCUDA needle-like teeth
• PERCH small teeth

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Other feeding styles

• Slurp-gun technique
• ex. Sea horse

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SCALES

• FUNCTION
• STREAMLINING, slippery mucous covering
• PROTECTION physical harm and parasites
• osmotic balance
• balance of water and salts

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VARIATIONS IN SCALES

• SCALES ABSENT IN MORRAY EEL
• SCALES FUSED IN THE SEA HORSE TO FORM A HARD
  OUTER COVERING.

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KIDNEY FUNCTION

• REMOVAL OF NITROGENOUS WASTE
• (ammonia, urea etc.)
• MAINTENANCE OF OSMOTIC BALANCE

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• FRESH WATER FISH
• EXCRETES LOTS OF WATER
• WELL DEVELOPED KIDNEY

• SALT WATER FISH
• DRINKS LOTS OF WATER
• EXCRETES LITTLE WATER
• EXCRETES EXCESS SALT (KIDNEYS AND GILLS)

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REPRODUCTION

• OVIPAROUS eggs fertilized outside the body,
  development external.
• Examples and variations
• Nest builders stickleback
• Mouth Breeders Jawfish

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• OVIPAROUS (Contd.)
• Eggs adrift in the plankton
• pelagic species (swordfish)
• Eggs laid on shore (beach)
• Grunion

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• OVOVIVIPAROUS Fertilization internal.
  Development internal.
• Young are born alive.
• Example Perch