FISH

FISH

1. DEFINITION

   • FISH ARE EXCLUSIVELY AQUATIC VERTEBRATES AND ALL THEIR CHARACTERISTICS MAKE THEM SPECIFICALLY SUITED FOR LIVING IN WATER

2. CHARACTERISTICS

   • THE MAJORITY OF THEM HAVE PROTECTIVE SCALES COVERING THEIR BODIES
   • THEIR BODY SHAPE HELPS THEM GLIDE THROUGH WATER EASILY AND THEY HAVE DIFFFERNT TYPES OF FINS
   • THEY ARE ECTOTHERMIC BECAUSE THEIR BODY TEMPERATURE DEPENDS ON THE TEMPERATURE OF THE ENVIROMENT
   • THEY BREATH THROUGH GILLS, THAT ARE ORGANS WICH EXTRACT OXYGEN FROM THE WATER

3. NUTRITION

   • MOST FISH ARE CARNIVORES
     • SOME ARE PREDATORS
     • OTHER ARE SCAVENGERS BECAUSE THEY EAT DEAD ANIMALS
   • OMNIVORES FISH EATS PLANTS AND OTHER AQUATIC ANIMALS
   • HERBIVORES FISH EAT AQUATIC PLANTS AND ALGAE

4. REPRODUCTION

   • FISH REPRODUCE SEXUALLY
   • MOST ARE OVIPAROUS AND LAY EGGS WITHOUT AN IMPERMEABLE SHELL

5. MAIN TYPES OF FISH

   • BONY FISH
     • THEY HAVE
       • BONE SKELETON
       • OPERCULUM: GILLS PROTECTED BY A HARD COVERING
       • A MOUTH AT THE END OR EDGE OF THEIR HEAD
       • HOMOCERCAL TAIL FIN: THE TAIL IS DIVIDED IN TWO EQUAL PARTS
     • TROUT, SALMON AND HAKES ARE BONY FISH
       • HAKE
       • SALMON
       • TROUT
   • CARTILAGINOUS FISH
     • THEY HAVE
       • A SKELETON OF CARTILAGE
       • GILLS WITHOUT AN OPERCULUM
       • A VENTRAL MOUTH AND A HETEROCERCAL TAIL
       • THICK, TOOTH-LIKE SCALES
     • SHARKS, SKATES AND RAYS ARE CARTILAGINOUS FISH
       • SHARK
       • SKATE
       • RAYS

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