I have to say up front that this was our worse dissecting experiment this year. I have never dissected a perch before and the photos in the book did not match the innards of our perches. I also forgot to look online for additional dissecting pictures. I have learned my lesson and will better prepare myself for next year.
The other major problem we had, was some of the fish were very dry. We were thankful to have some good specimens to look at.
This young lady had the biggest perch in the class.
I had to leave the room to get another tray. As I was leaving I told the class to pet their fish and give it a name. I came back and all the students were petting their fish. LOL They have now named all of their dissecting specimens.
We first examined the outside of the perch.
The Lateral Line senses vibrations in the water. For a perch the Lateral Line is used to warn them of possible predators.
The fins are spiked and used for defense.
These are the gills. Used for respiration. Each student cut one of the gills out and placed them in a bowl of water. Most of the gills were so dry, they didn’t do anything. One did fluff up a little.
You should have heard the squeals (of horror), when I told the students to pull a scale off and look at it under the magnifier. lol Scales have rings in them and they show the growth of the fish.
As I said at the beginning, this was not our best dissecting experiment. The students were getting a little bored, so they started having their fish talk to them.
After the outside was throughly examined, we started cutting to the inside. This is where I stopped taking pictures. We had several problems and I had to keep jumping from one student to another, so I had no time to take pictures.
This experiment was the smelly and messy! It took us a while to clean all the trays and tools. A few students had to go out for some air or wash their hands.
Here is a great site for the perch. It has pictures that you can use along with your fish. Yellow Perch Dissection
There are excellent perch dissecting links at Apologia’s website. On page V of the textbook, you’ll find the link to extra information for each chapter.
Next, but in the same module, is the frog. We had more success with the frog and more fun. Stay tuned.