48% 21% 6% 14% 11% Living Vertebrates What is a FISH?
-
Upload
ilene-francis -
Category
Documents
-
view
214 -
download
1
Transcript of 48% 21% 6% 14% 11% Living Vertebrates What is a FISH?
48%21%
6%
14% 11%
LivingVertebrates
What is a FISH?
BluefishPomatomidae: Pomatomus saltatrix
To 1.1 m. (45 inches) 12 kg. (27 lbs.).
DolphinCoryphaenidae: Coryphaena hippurus
To 1.6 m. ( 5.25 ft.) 40 kg. ( 88 lbs.)
LookdownCarangidae: Selene vomer
30 cm (1 ft.)
FISH
• Poikilotherms (cold blooded)• Covered in Scales• Have fins• 99% have external fertilization and external
development• Live in water
FINS-propulsion, turn, brake, steer
Teleost Senses
• Have inner ears for hearing.• Good vision.• Good sense of smell.• Lateral line lets them “feel”.
Lateral Line
Is there a difference in swim bladder size between a FW fish and a SW fish????
Is there a difference in kidney size between a FW fish and a SW fish????
Fish scales
Lungfish
• Primitive fish• Found in FW only• Live in Australia, South America and Africa• Breathe air• Can drown if held underwater.• Can survive droughts by hibernating in mud
balls for up to 3 years.
SEX
Gray SnapperLutjanidae: Lutjanus griseus
To 60 cm. ( 2 ft.) 4.5 kg. (10 lbs.)
Electrophorus electricusNarcine brasiliensis
Examples of Commercially Important Fishes
Practical Considerations: Commercial Fisheries• Global fisheries statistics maintained by the Food and Agricultural Organization
(FAO) of the United Nations• Importance of aquaculture• Overharvesting of commercially important fishes
– Anchovies• Fishery concentrated in upwelling zone off the coast of Peru• Effect of El Niño on fishery
– Tuna• Incidental catch: dolphins
– Salmon• Spawn in fresh water • Human impacts on spawning grounds
– Atlantic cod• Collapse of cod fisheries
Anchovy catch in Peru and Ecuador
From left: Eric Hunt, JLB Smith, the DC3's pilot, a local French governor, and several Comorans surround the "second"
coelacanth that established the Comoros as the first home of the famous "living fossil" in 1952.
At a stopover on the way back to South Africa, a nervous JLB Smith sleeps next to the "second" coelacanth in its travel box!
CoelacanthLatimeriachalumnae