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Biome (Life in Water) (Characteristics of fish (sense organs/sense…

- - - - survival mechanism
  - - - for swimming long periods of time
    - - for fish that do not travel far
      - quick acceleration and stopping
- - - - pair of eyes
      - no jaw
- - - - Lampreys
        
        fresh water breeders
        
        Though they spend most of their time in the ocean
        
        parasitize other fish
        
        attaches to a host
        
        eats bits of flesh
      - Hagfish
        
        Bottom feeders
        
        scavengers of dead or dying fish
        
        Secrete a protein "slimy musk" if threatened
      - Round Mouth
        
        Cylindrical body
        
        No fins- move by wiggling
        
        Made from keratin "hard parts"
      - This clade has a Cloaca
        
        Multipurpose opening that eliminates waste and used for reproduction
  - - - serve as part of jaw
        
        Jaw derived from gill supports
    - - Scales
        
        Hard, flat structures that cover skin
      - Fins
        
        Flattened appendages
        
        Propel and steer a body while swimming
    - - Skeleton made of cartilage "jawed fish"
        
        Aka: Chondrichthyes
        
        Sharks, rays, skates
        
        Some are speedy predators
        
        some are scavengers
        
        some strain plankton from water
        
        paired immobile fins
        
        Multiple rows of teeth that are shed and replaced
        
        Gills that are visible on body surface
    - - Skeleton consist of bone
        
        Two modern lineages
        
        Lobe-finned
        
        pelvic and pectoral fins supported by bones
        
        gills with lungs (1 or 2)
        
        Lungfishes
        
        air filled sacs, respiratory organs
        
        This lineage and their adaptations facilitated the evolutionary move to land animals
        
        Ray-finned
        
        Weblike fins derived from skin
        
        most diverse veterbrate group
        
        Swim bladder to adjust bouyancy
        
        Most have movable pelvic and pectoral fins
        
        Movable cover over gills
      - not a true clade
      - Gas filled organ/s
      - Three body openings for urinary waste, digestive waste and gametes
- - - - similar body features of fish (some)