SHARK DISSECTION Pre-lab Preparations NOTE: Formal Lab Write ...
SHARK DISSECTION Pre-lab Preparations NOTE: Formal Lab Write ...
SHARK DISSECTION Pre-lab Preparations NOTE: Formal Lab Write ...
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<strong>SHARK</strong> <strong>DISSECTION</strong><br />
<strong>Pre</strong>-<strong>lab</strong> <strong>Pre</strong>parations<br />
<strong>NOTE</strong>: ☼ <strong>Formal</strong> <strong>Lab</strong> <strong>Write</strong>-up (with on-line template)<br />
A. Bring to <strong>lab</strong>:<br />
1. 4 large black garbage bags<br />
2. 4 kitchen size white garbage bags<br />
3. 4 pairs latex gloves<br />
4. Small bottle Dawn dishwashing liquid (blue or orange) for extra credit.<br />
B. DO NOT wear open-toed shoes of any kind to <strong>lab</strong>.<br />
C. Tie back long hair and bring an old shirt to wear.<br />
D. <strong>Lab</strong>el Exterior Shark Diagram (cut out & put in results, diagrams, include title)<br />
E. Record functions of external structures (put in results, under data, table form, w/ title)<br />
F. <strong>Lab</strong>el Interior Shark Diagram (cut out & put in results, diagrams, include title)<br />
Shark dissection website with videos:<br />
http://www.amnh.org/learn/pd/sharks_rays/rfl_dissection/<br />
Watch the following video clips:<br />
1. Intro. to specimen<br />
2. Overview of specimen<br />
3. Dissection : opening the two cavities<br />
4. Liver dissection: watch, but DO NOT REMOVE THE LIVER!<br />
5. Description of Alimentary canal<br />
4<br />
2<br />
5 6<br />
1<br />
9<br />
11<br />
12<br />
7<br />
8<br />
10<br />
3<br />
External Anatomy of Dogfish Shark
Internal Anatomy – Dogfish Shark
Anatomy of the Shark – Functions of External Structures<br />
the dogfish shark, Squalus acanthias.<br />
The dogfish is a small predator that occurs along both coasts of the Atlantic Ocean. This<br />
shark has internal fertilization, with the eggs being retained in the mother during their<br />
development (ovoviviparous). The young are then born live. The dogfish has the longest<br />
gestation period of any of the sharks, extending for 16 – 20 months. Usually two to six<br />
pups are born per litter and will measure approximately six inches long.<br />
The terms to be covered during the examination of external anatomy include:<br />
1. Spiracle: modified gill slit for water intake to mouth and gills<br />
2. Lateral line: sensory cells that pick up vibration in water from over a<br />
600 yard distance!!!<br />
3. Gill slits: water passes over gills and respiration occurs<br />
4. Anterior dorsal fin: bears spine for protection from enemies<br />
5. Posterior dorsal fin: bears spine for protection from enemies<br />
6. Caudal fin: drives shark forward<br />
7. Pectoral fin: swimming and steering<br />
8. Pelvic fin: swimming and steering<br />
9. Clasper: if specimen is a male, these fingerlike extensions of the pelvic<br />
fin will be used to transfer sperm to the female during mating.<br />
10. Mouth: note ventral location<br />
11. Nostrils: paired nostrils for olfactory sense can detect blood from a<br />
distance of ¼ mile. (one part blood in 100 million parts of water)<br />
12. Ampullae: tiny pores in the face for picking up electric fields in the water<br />
to help guide the shark and locate prey at minimal distances.<br />
Placoid Scales:<br />
Dermal denticles of the shark’s skin with a similar structure to<br />
teeth – gives a sandpaper feel. You will have the opportunity to<br />
feel this later.