Fish Dichotomous Key
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- Randolph Dennis
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1 Fish Dichotomous Key The identification of biological organisms can be greatly simplified using tools such as dichotomous keys. A dichotomous key is an organized set of couplets of exclusive characteristics of biological organisms. You simply compare the characteristics of an unknown organism against an appropriate dichotomous key. These keys will begin with general characteristics and lead to couplets indicating progressively specific characteristics. If the organism falls into one category, you go to the next indicated couplet. By following the key and making the correct choices, you should be able to identify your specimen to the indicated taxonomic level. When you follow a dichotomous key, your task becomes simpler if you use a few simple rules of thumb: A. Read both choices in a couplet carefully. Although the first description may seem to fit your sample, the second may apply even better. B. Keep rough notes telling what sequence of identification steps you took. This will allow you to double-check your work later and indicate sources of mistakes, if they have been made. C. If you are unsure of which choice to make in a couplet, follow both forks (one at a time). After working through a couple of more couplets, it may become apparent that one fork does not fit your sample at all. D. When you have keyed out an organism, do not take your effort as the final result. Double check your identification scheme, using your notes. E. When reading a couplet, make sure you understand all of the terms used. The best keys will have a glossary of technical terms used in the key. If a glossary is unavailable, find a good reference work for the field (textbook, biological dictionary, etc.) to help you understand the term. A key has been provided with this activity. Put your answers here. Give the SCIENTIFIC NAME:
2 Marine Fish Key 1. a. The fish has a body like a snake. Go to #2 b. The fish does not have a body like a snake. Go to #3 2. a. The fish has a beaklike mouth. Anquilla rostrata (American eel) b. The fish has a suction cup type mouth. Petromyzon marinus (Lamprey) 3. a. The fish has eyes on the same side and a flattened body. Go to #4 b. The fish does not have eyes on the same side and no flattened body. Go to #5 4. a. The fish has a forked tail. Hippoglossus Stenolepsis (Halibut) b. The fish does not have a forked tail. Paralichthys Albigutta (Gulf Flounder) 5. a. The fish has placoid scales. Go to #6 b. The fish does not have placoid scales. Go to #7 6. a. The fish has a pointed head. Squalus acanthias (Dogfish shark) b. The fish does not have a pointed head. Sphyrna mokarran (Hammerhead shark) 7. a. The fish s body is full moon shaped with a little caudal fin. Mola mola (Ocean sunfish) b. The fish s body is not distinctly moon shaped and has a highly visible larger caudal fin. Go to #8 8. a. The fish s body is club shaped like a baseball bat. Anarhichas lupus (Wolffish) b. The fish s body is not club shaped like a baseball bat. Go to #9 9. a. There is evidence of a chin barbell. Go to #10 b. There is no evidence of a chin barbell. Go to # a. The caudal fin is not notched or only just barely notched. Go to #11 b. The tail fin is decidedly notched. Go to # a. The fish has 3 distinct dorsal fins (top side). Gadus morhua (Atlantic Cod) b. The fish has 2 distinct dorsal fins. Merluccius merluccius (Hake) 12. a. The lower jaw extends beyond the upper jaw. Theragra chalcogramma (American Pollock) b. The lower jaw does not extend beyond the upper jaw. Melanogrammus aeglefinus (Haddock) 13. a. The fish has finlets Go to #14 b. The fish does not have finlets. Go to # a. The dorsal fins are widely separated. Scomber scombrus (Mackeral) b. The dorsal fins are not separated widely. Thunnus maccoyii (Bluefin Tuna) 15. a. The fish has a small adipose fin. Osmerus mordax (American Smelt) b. The fish does not have a small adipose fin. Alosa pseudoharengus (Alewife)
3 Found below are some helpful descriptions used in the dichotomous key. Barbells a small whisker like structure found on the lower jaw Caudal fin tail fin Dorsal fin fin on the back of the fish Placoid scales special scales found in sharks and rays Notice how placoid scales are individual scales that do not overlap. They are much like the enamel of your teeth. Sharks skin can be used as sandpaper. Adipose fin small fleshy fin between the caudal and dorsal fin Finlets -small finlike growths between tail and dorsal and anal fin Your job is to classify the fish on the picture that is provided using the guidelines found above. The picture below will help you identify the location of the fins.
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6 Now, using the animals below, make up your own dichotomous key. The first one is done for you. 1) a. Animal has a flattened body. Go to #2 b. Animal does not have a flattened body. Go to #3 2) a. 3) a. 4) a. 5) a. 6) a.
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