Wednesday, May 29, 2013

More about cartilaginous fish

1. Explain how cartilaginous and bony fish regulate the salt found in the water.
-Bony fish drink a lot of seawater to say hydrated. With cartilaginous fish, they are expected over the gills

2. What are some key difference in life history between cartilaginous fish and bony fish?
-Cartilaginous fish= slow reproducing
-bony fish= fast reproducers.

3. Describe how sharks reproduce. 
-Some sharks grasp the females pectoral fins, or bite and hold onto the body. 

What are cartilaginous fish

1. What makes cartilaginous fish different from other fish? Give examples.
-their Skeletons are made of cartilage.

2. List examples of cartilaginous fish.


3. What is special about the sharks eye?
-they have good vision in dim light. their pupil can dilate and contrast to control the incoming light.

4. What are the differences between bony fish and cartilaginous fish:
a. Heart and Blood - Sharks have fewer red blood cells,sharks have no bone marrow
b. External features - Shark skin is covered by dermal denticles. Bony fish are covered in flat scales.
c. Digesting and Evacuation - Bony fish have two seprate openings, sharks have only one opening called the cloaca.

Monday, May 27, 2013

Marine anthropods

1. What are examples of marine anthropods?
-northern lobsters, spiny lobsters, female rock crab, spotted cleaner shrimp.

2. What is the difference between an anthropod skeleton and a human skeleton?
-anthropods shed from their old one to a new one.

3. Compare/contrast how anthropods and humans move blood in their circulatory system.
-anthropdos are not like humans they don't have what we humansa have to pump blood like veins or arteries to carry the blood they pump loos through a sinvses.

4. How the eyes of anthropods differ from our eyes?
-they have compound eyes and easily detect movement.

5. How do humans use marine arthropods?
-we eat them.

Marine science words of wisdom

1. Choose a quote.
-grey whale mothers nurse their babies for 6-8 months giving them rich milk which allows them to quickly gain the blubber they will need in cold water. However, the mother barely eats during that time and loses 1/3 of her body weight. She is near exhaustion. By the time she and her calf begin their 10,000 mile migration to the bearing sea.
-life lesson from a grey whale your parents love you very much, want the best for you always, and will do just about anything to make sure you are successfully.

Nine major animal phyla

1.list all nine major animal phyla, and an example image of animal in the phlya.
*porifera                       *annelida
*colenterata                *arthropoda
*platyhelminthes      *mollusca
*nematod               *echinodermata

2.what type of habitat can these species be found?
~Porifera-found in aquatic habitat.
~Colenetrata-found in marine habitat.
~platyhelminthes&nematoda-found in fresh and salt water terrestrial land.
~annelida, molluscs, and chordata- found in marine, fresh water, and terrestrial land.
~arthropoda-found in all enviroments.
~echinodermata-found in ocean floor.

3. How does the species digest food?
~platyhelmunthes&coelenterata have incomplete digestive system. (one opening)
~echinodermata, annelida, and nematoda have a complete digestive syatem. (two openings)

4. Have you seen an example of a species in phyla? Explain where and what Tue situation is.
~ no

End of the line movie part 2

BIG QUESTION: Why should we humans be concerned about our fishing?
1. What are the "big five" fish we eat?
-cod-haddock-tuna salmon & prwans.

2.what is the reason for not eating sharks or other low water fish?
- the reason is they have higher envirimental standards.

3. What are some fish to eat occasionaly and fish to avoid?
-TO EAT: crab, mussel, sword fish, anchovy. 
-NOT TO EAT: sea bass, shark, rays, marlin


Monday, May 13, 2013

End Of The Line Movie

BIG QUESTION: What happened to an ecosystem when a species goes extinct?

1. What is the most voracious predator in the ocean has ever seen?

2. Are the oceans renewable? Why?
- yes if humans wern't fishing so much .

3. When did the cod become fished out, how many people lost their job?
- 1992, About 40 thousand people lost their job.

4. What puzzeled scientist in 2001, When was the answer found? And what was the answer?
- The world catch kept going up and up while local catch went down. The answer was found in china, China was catching a lot.