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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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.