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f99u2le3 - FISH ECOLOGY Lesson 3 Fish Food Lesson...

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©P ROJECT O CEANOGRAPHY F ALL 1999 F ISH E COLOGY 42 F ISH E COLOGY Lesson 3. -- Fish Food Lesson Objectives: ± Identify relationships organisms have with each other. ± Describe food webs and food chains in the ocean. Vocabulary words: absorption, osmosis, diffusion, mucous, herbivore, biotic, decomposers, and others pertaining to fish feeding How do Animals Feed in the Ocean? Animals that live in the ocean use three methods of feeding: absorbing, filtering and grabbing. Plankton commonly obtains food by absorption . For example, single-celled diatoms draw nutrients from seawater by simple diffusion and osmosis . Other organisms, such as scallops and worms, filter the plankton and organic matter out of seawater by pumping it over gills, mucous nets or other sieve-like structures. Grabbing is a familiar mechanism that occurs when one animal attacks and eats another. This is an active response rather than a relatively passive one, like filtering. The predator may have sensory organs to stalk its prey and teeth, suckers or stingers to capture and eat it.
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