Microorganisms are those microscopic living things invisible for us, but essential for all living beings' existence. It is true sometimes those microorganisms could be harmful for human beings. That is the reason we have an efficient immune system that prevents us from becoming ill too often.
Nonetheless, many microorganisms are innocuous or even beneficial, as bread or wine yeasts, or bacteria in our intestine.
Even you do not believe it, on your hands, in the air surrounding you, inside your mouth, there are thousands of microorganisms. Due to this practice, we are going to check all this, to show you I am not telling lies.
In this practice we are going to prove we live surrounded by microorganisms, and we hardly ever get ill because of this.
Living things are similar to and different from each other. When we look at the inside of a fish, we will learn that certain organs and systems in fish are similar to those in humans; and other organs and systems are not. Stomach contents can tell us much about a fish’s habit. The external anatomical features (outside body parts) of fish can also tell us a lot about a species-where it lives in the water, how it finds food, and how it protects itself from predators.
That's why today's dissection is going to be a really educational activity.
The following link, is the lab class sheet we are using. In it, it's described the fish anatomy, materials, protocol, and some exercises. First of all, WE MUST READ THIS SHEET, in order to do a proper practice.
I also attach a video link of the inner estructure of a bony fish. Check it, to be able to label your specimen.
To do this, we are using labelled needles/labels with the following names: liver, kidney, gonad, heart, intestine, stomach, swim bladder, caecum, spleen and fins.
