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Fish Internal and External Anatomy. ( Centrarchidae ). Fish are aquatic vertebrates that are typically Ectotherms (cold-blooded) Covered with scales Has a gill cover called an OPERCULUM Minimal Protective Mucus, nonselective defense against bacteria

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centrarchidae
(Centrarchidae)
  • Fish are aquatic vertebrates that are typically Ectotherms (cold-blooded)
  • Covered with scales
  • Has a gill cover called an OPERCULUM
  • Minimal Protective Mucus, nonselective defense against bacteria
  • Multiple sets of paired fins and unpaired fins
fish anatomy
Fish Anatomy

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functions of the gill
Functions of the Gill

SMALL PARTICLES: Tiny particles of food are strained by long projections of gills called gill rakers, as the particles are carried in the water passing over the gills.

functions of the gill1
Functions of the Gill
  • Gill Functions
    • When water is passed over the gills, oxygen is absorbed and carbon dioxide and ammonium is exhaled.
    • 75% of the ammonia excreted by the fish is through the gills.
    • The gills also help the fish osmoregulate, (equalize body pressures).
    • They are covered by a bony flap known as the operculum.
    • Each gill consists of a bone arch with filaments extending at right angles to the arch.
    • Lamellae are the tiny branches on the filaments.
    • Healthy gills are bright red and do not stick together.