Fish dissection
Observations
1. The body shape of the perch is relatively flat and skinny, also known as a streamline body. This helps water to rush over the sides and enable it to quickly move through the water.
2. A function of the gill rakers could be to filter tiny particles of food. They help to aid the fish's feeding.
4. The scales on the perch face towards the end of the fish, away from the head. This could help them to move more easily and efficiently through the water.
5. The perch has two nostrils.They are different from my nostrils because they do not open into the back of the mouth, which mean they aren't for breathing. Instead, they lead to organs of smell, which allows them to sense food from a considerable distance.
6. Characteristics that I observe in the gills are that there are very many tiny, thin filaments that continue to branch out. This makes for a larger surface area, which allows oxygen to rapidly diffuse into the blood.
7. The lateral line is a jelly-filled tube or canal lined with nerve endings just below the skin that opens to the outside water by tiny pores. The function of the lateral line is to detect movement in the water. If an animal in moves in the water, the jelly tube vibrates, which stimulates the nerve endings, and they send signals to the brain. This makes even a blind fish very difficult to catch.
Critical Thinking and Application
1. Endoskeletons are advantages for perches because they allow much more movement, easier mobility, protection for the organs, and breathable skin. They also dont restrict growth of the animal and they dont require very much energy to shed. If the fish were to have an exoskeleton, it would be harder to control it's temperature, and it is also a bigger deal to get hurt because the organs could be crushed.
2. The guppy produces less eggs because it has to hold them inside and then give life birth, while the perch leaves large amounts of eggs on exposed rocks. However, the guppy has a higher survival rate because the young are born live, which helps then to survive. The perch leaves their young on rocks, which makes them vulnerable to predators.
3. The function of the swim bladder is to regulate the fish's position in the water. When the perch fills the sim bladder, it is able to rise in the water. When the gas level goes down, the fish floats.
1. The body shape of the perch is relatively flat and skinny, also known as a streamline body. This helps water to rush over the sides and enable it to quickly move through the water.
2. A function of the gill rakers could be to filter tiny particles of food. They help to aid the fish's feeding.
4. The scales on the perch face towards the end of the fish, away from the head. This could help them to move more easily and efficiently through the water.
5. The perch has two nostrils.They are different from my nostrils because they do not open into the back of the mouth, which mean they aren't for breathing. Instead, they lead to organs of smell, which allows them to sense food from a considerable distance.
6. Characteristics that I observe in the gills are that there are very many tiny, thin filaments that continue to branch out. This makes for a larger surface area, which allows oxygen to rapidly diffuse into the blood.
7. The lateral line is a jelly-filled tube or canal lined with nerve endings just below the skin that opens to the outside water by tiny pores. The function of the lateral line is to detect movement in the water. If an animal in moves in the water, the jelly tube vibrates, which stimulates the nerve endings, and they send signals to the brain. This makes even a blind fish very difficult to catch.
Critical Thinking and Application
1. Endoskeletons are advantages for perches because they allow much more movement, easier mobility, protection for the organs, and breathable skin. They also dont restrict growth of the animal and they dont require very much energy to shed. If the fish were to have an exoskeleton, it would be harder to control it's temperature, and it is also a bigger deal to get hurt because the organs could be crushed.
2. The guppy produces less eggs because it has to hold them inside and then give life birth, while the perch leaves large amounts of eggs on exposed rocks. However, the guppy has a higher survival rate because the young are born live, which helps then to survive. The perch leaves their young on rocks, which makes them vulnerable to predators.
3. The function of the swim bladder is to regulate the fish's position in the water. When the perch fills the sim bladder, it is able to rise in the water. When the gas level goes down, the fish floats.