Our third installment of animal dissection was the fish.
Since we had so much trouble with the preserved fish last year, I decided this year we would dissect a fresh fish. One of my students fishes with his dad often and was able to catch us two Sand Perch for this very exciting event.
The fish was frozen and then thawed just before we needed them for the class. PERFECT! I am fabulous at thinking ahead like this.
The Co-op’s Administration kicked us out of the building and forced us to dissect outside, in the wind, in the cold. Ok, they really didn’t kick us out, but they did ask. It was a beautiful day, so we went outside.
The student’s opened the bag and pulled out the fish. One student got up right then and there, ran inside and came out looking like this. His buddy thought it was a great idea and so copied him. They used rubber-bands to secure their shirts over their noses.
They couldn’t stand the smell. LOL It was pretty bad and I was thankful we were outside. Our class is the hour before lunch and the smell would not have been very appetizing for dining.
The first thing we always do is examine the outside of the specimen. Here you see the students examining the fins. Some fins have spikes and some are rays. This is to be noted in their lab write-up.
The fish is looking pretty good and I congratulated myself for getting fresh specimens. This was going to be a great experiment. Oh Yeah! I’m awesome!
Next up, we look at the inside of the mouth.
So far so good!
Next step is to look at the gills and note what they look like and how many the fish have. Sorry, I don’t have a photo of that.
Then the best part begins. The students take a scalpel and cut off the side of the fish to expose the inside. We are to identify and label all parts of the innerds.
The students make four cuts to make a rectangle shaped opening and then…
All the guts just slide right out. It was disgusting. So much for my brilliant idea to get a fresh fish! Freezing it before hand was a bad idea. At least I am still awesome.
We identified as much as we could, but it wasn’t easy.
The above photo is of the stomach’s contents. We think it ate shrimp and a little squid thingie. Squid thingie is technical for “we don’t know what it is, but it looks interesting to be called squid thingie”.
This young lady, below, kept saying ewww and gross and disgusting when we had our previous classes. This time; however, she dived right in. The boys were amazed. LOL
I am seriously thinking of eliminating this experiment from my class next year. It just isn’t worth it.