Lecture 2

Question 1

Paired fins

Answer 1

pectoral and pelvic

Question 2

unpaired fins

Answer 2

anal, caudal, adipose, dorsal

Question 3

Dorsal and anal fins

Answer 3

stabilizer

Question 4

pelvic fins

Answer 4

aerofoil, brake, propulsor, rudder, walking, hovering

Question 5

Pectoral fins

Answer 5

• open water: long and pointed to reduce drag and wide and rounded in slower moving fish
• bottom feeders: broad/rounded and spread out laterally
  -gliding fish greatly enlarged
• sharks: rigid and are used to generate lift

Question 6

Caudal fin: heterocercal

Answer 6

unequal lobe: viewed in sharks

Question 7

Caudal fin: homocercal

Answer 7

equal lobe: advanced teleosts

Question 8

Adipose fins

Answer 8

hydrodynamic attributes

Question 9

placoid scales

Answer 9

in cartilaginous and bony fish, ex: sharks

Question 10

ganoid scales

Answer 10

bony ancestral fish, ex: gar pike

Question 11

elasmoid scales

Answer 11

derived teleosts

Question 12

two types of elasmoid

Answer 12

cycloid: round, ex: salmon
ctenoid: comb-like projections called ctenii, ex: bass