Learning Fishes WFC 50 2008

Learning Fishes WFC 50 2008 - LEARNING FISHES 1 Acquaint...

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Unformatted text preview: LEARNING FISHES: WFC 50 2008 1. Acquaint yourself with basic fish structure and fins as in the diagram below. Lateral line Maxilla Branchiostegal D e n t a r y b o n e r a y s ' Pectoral ( l o w e r m a n d i b l e ) e fin Pelvic fin 2, working in teams of 2-3, figure out the ecology of the nine species from Piitah Creek, using the materials provided. 3. In discussion with the TA, place the fishes on an ecological gradient from cold fast water to warm slow water FAST------------------------------------------------------------------------------------------SLOW C O L D W A R M Largemouth bass, bluegill, mosquitofish, and black bullhead are all introduced (alien) species. What does this tell you about stream habitats most likely to be dominated by native and non-native species? FISHES : INFERRING ECOLOGY FROM MORPHOLOGY You can learn much about the ecology of a fish just by looking at it and using a bit of deductive logic. This exercise takes a group of fish from Putah Creek and asks you to look at them closely and then infer their basic ecology. Is the fish in front of you a slow or fast swimmer? Is it a predator on large prey or small prey relative to its body size? Tail shape. A rounded tail implies a slow swimmer while a deeply forked tail implies a very fast swimmer. There is a gradient of tail shapes. Mouth size. The bigger the mouth, the larger the prey size. Large fish with large mouths tend to eat other fish, ducks, dogs, etc. Small fish with large mouths each large invertebrates,while those with small mouths tend to eat small invertebrates and algae. Mouth position . A terminal mouth (end of head) indicates ,usually, a predator or a fish that can pick individual prey from the bottom or plants. A subterminal (inferior) mouth (below end of head) indicates a bottom feeding fish. A superior mouth (top of head)(below end of head) indicates a bottom feeding fish....
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Learning Fishes WFC 50 2008 - LEARNING FISHES 1 Acquaint...

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