BIOL 1108 Edition 1st Lecture 11 Outline of Last Lecture I Respiration II Buoyancy Regulation III Gas Release Addition IV Sound reception V Locomotion Outline of Current Lecture I Locomotion II Feeding III Reproduction and Development Current Lecture I II Locomotion Myomeres series of muscles along the sides of the body that connect the backbone to the skin o Distribution depends on body shaped Serpentine shape entire body has myomeres Fusiform shape use lower half quarter part of the body Feeding Jaws and Teeth o Pharyngeal Jaws apparatus crushing and holding food o Most fish do not masticate mechanical digestion occurs in stomach Jaw Protrusion o Ability to move the jaws forward while feeding independent from the rest of the body Suction feeding prey gets sucked into predator s mouth using differences in water pressure in and out the jaws Ex Boney fish Accelerates the speed of the bite little movement of the actual body Elasmabranch jaw protrusion Palatoquadrate upper jaw not connected to the skull These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III o Optimizes angle of bite and faster speed Gill Rakers projections on the gill arches Reflect feeding habits smaller prey longer thinner and more closely spaced rakers Keeps food from coming out of gills Reproduction and Development 1 Larval Stage the first day after hatching that does not resemble the juvenile or adult stage a Fertilized larvae juvenile adult b Fertilization is external eggs are fertilized outside the body c Spawning release of the eggs d Some fish have internal fertilization ex Sharks i Elasmabrachs and Poecilidae ii Elasmabrachs have claspers modified pelvic fins used to transfer sperm iii Poecilidae have gonopodium 2 Indeterminate Growth a Grow continually throughout life b Rate of growth slows down over time Influences Reproduction increases in success with size o Female fish produce more eggs as they get larger o Mate with larger individuals through sexual choice o Larger fish can better defend territories Predator avoidance increases survival o Large fish have fewer predators Feeding increased feeding opportunities o Can eat both larger or small prey
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