Tuesday, November 24, 2009
Students participated in a tough challenge about sharks some students made up during zero block and only Maria S got a perfect score though there were lots of folks who only missed one.
Students tested their knowledge with a shark puzzle and Zac was the fastest. Afterwards students finished up some odds and ends and took the shark test.
We finished the day with a film called Anatomy of a Sharkbite which follows a scientist Erich Ritter and his experience with a Bull Shark bite as well as analyzing shark attacks and bites on others in an effort to understand sharks. We will conclude the video tomorrow.
Friday, November 20, 2009
Wednesday, November 18, 2009
The fins are harvested for shark fin soup. Shark fin soup is considered a delicacy in some countries and can sell for upwards of a hundred dollars a bowl.
The next thing we talked about was shark attacks. Most shark attacks are actually provoked by humans. Other shark attacks like bump-and-bites and hit-and-runs are the shark investigating a human to see if it is something good to eat. Once the shark tries it, it finds it doesn't like humans, it will swim away. Unfortunately for us humans, we are not so tough and kind of squishy and shark attacks damage us.
Tuesday, November 17, 2009
Skates and rays are really similar and often hard to tell apart. Some rays look like flat sharks and some flat sharks look like rays, so we are going to be general in identifying skates and rays. In general, skates have fins on the tips of their tails.
Only rays can have stingers, and not all of them do. They can have 1 to 3 stingers from 5 to 15 inches long. See the picture below.
I often get asked about Steve Irwin, the famous Crocodile Hunter when we talk about stingrays. Yes, Steve Irwin was killed by a stingray, but his type of accident was very rare. Steve got stabbed in the heart which injected venom right into an important organ. Also, he removed the barb which caused just as much damage going in as it did coming out because of the sharp serrated edge. For more information about Steve Irwin's death check here and here.
Monday, November 16, 2009
Follow this link for a cool interactive about how shark jaws stick out when they attack their prey! The interactive is down at the bottom.
If you are doing a final project on a shark... check out this new link! www.shark.ch
And once again... one try only... how much do you know about sharks? MsJ scored a 1467. Try Shark Weeks Ultimate Shark Challenge to see how much you know.
Friday, November 13, 2009
Not a lot is known about shark reproduction because in many cases it has never been observed.
Some sharks are oviparous and lay eggs (pictured). These egg cases are known as mermaid's purses. You can see the baby shark and its nutrient-rich yolk through the leathery egg case.
Some sharks are viviparous and have live birth a lot like mammals.
And some sharks are ovoviviparous and keep their eggs inside the uterus before releasing them... so its making eggs and then kind of having live birth.
Wednesday, November 11, 2009
Next up is SHARKS! Students got a little preview after finishing their tests today. We watched a little video about great whites in the waters off the coast of South Africa that leap out of the water to chase the fur seals they want to eat that also leap out of the water.
Try Shark Weeks Ultimate Shark Challenge to see how much you know. (Play only once) MsJ scored 1370.
Monday, November 9, 2009
Students finished the day by designing their own fish and answering key questions about body shape, tail shape, and mouth shape. First period's are due Thursday and fourth period's are due Wednesday.
Students are being very creative. Here are some fo the ones that are finished. Some even included the biome as the background and those look especially nice.
Friday, November 6, 2009
One the major problems with most commerical fisheries is the amount of bycatch. Bycatch is anything caught in the net that you do not want. This could include edible fish that your company is just not equipped to process.
Most organisms brought up in nets as bycatch do not survive because they are crushed or drowned. Sea turtles and dolphins sometimes get swept into nets and drown because they cannot make it to the surface to breathe.
Most scientists and fisherman agree that the oceans have been and are being overharvested. People may not like regulations, but without regulations, many fish species that we used to commonly consume would be extinct.
The Unit 7 Test will be on Thursday.
Thursday, November 5, 2009
Next students participated in a challenge identifying fish mouths, fish tails, and more. Students were very competitive and were trying to get the top score. In first period, Megan scored the highest and in fourth period Terelle beat out Dale by one point. Students were amazed at this picture of the Mekong catfish (which has forked tail).
Wednesday, November 4, 2009
We started discussing marine harvesting and fishing today by talking about who harvests the most seafood (China), who eats the most seafood (China), and which people eat the most seafood pounds per person (the Maldives). Americans are about sixth on the list as far as consumption, but we are the number one consumer and importer of shrimp. Importing shrimp is damaging to the environment for two reasons.
1. Shrimp that are farmed in other countries are not as regulated as here in the states, so shrimp farm pollution is not as regulated and it damages coral reefs. Also many mangroves are cleared to build these farms.
2. US boats are required to have turtle excluder devices (TED) on trawl nets so that turtles do not get caught in shrimp nets and drown. Other countries do not regulate this and as a result catch and drown sea turtles.
To make a environmentally responsible seafood choices, choose shrimp that are farmed or caught in the US. For more sustainable seafood choices, check out Seafood Watch.
Tuesday, November 3, 2009
Monday, November 2, 2009
By producing a lot of eggs, the snapper hope to overwhelm any predators trying to make a meal so that there is no way all the fry are eaten and some will have a chance of surviving.
Today we also discussed invertebrate projects and upcoming final projects on vertebrates.
Invertebrate projects were graded over the weekend and quite a lot of them were incomplete. We discussed the high quality of their writing and the poor quality of required information. We also discussed how if this quality of work was submitted for final projects, some of the students would have very disappointing grades. Students will have a chance to resubmit invertebrate projects by the end of this week.
Final projects are on vertebrates and will be in powerpoint form. These projects will count as 10-20% of a student's grade depending on if they are exempt from the final. Students will have six to seven computer lab days to work on these projects as well as guidelines to follow. Any additional time will need to be made up by the student during zero block or after school.
Computer Lab Etiquette
You are in the computer lab to do work for this class. If you are not doing work, then we will have problems.
Do not pack up early. Work until the bell or until MsJ says.
SAVE OFTEN. And if you save to a key, also save it to your number. If you lose it, you will have to do it again.
If MsJ asks for your attention, stop what you are doing and listen to what she has to say.
You may watch videos about your organism through reliable websites.
You may listen to music through the computer if you have your own headphones. Rule1 MsJ cannot hear it. You get one warning. Rule2 Turn it on and listen – no million clicks and constant changing. Take both ear phones out when MsJ is talking.