The perch dissection was the dissection of a fish. The fish was very segmented, similar to the flatworm. The perch does have a skeleton. Porifera have a skeleton, made out of lime and silicon. Cnidaria (jellyfish) have no bones, exoskeleton, or shell. Annelida have a hydrostatic skeleton. Unlike any of the dissections prior to the perch dissection, the perch does have scales. Mollusca and perches both have gills.
Fishes are aquatic vertebrates; most fishes have paired fins, scales, and gills. The evolution of the jaws and the evolution of paired fins were important developments during the rise of fishes. Adaptions to aquatic life include various modes of feeding, specialized structures for gas exchange, and paired fins for locomotion.
Groups of Fishes: When you consider their basic internal structure, all living fishes can be classified into three groups: jawless fishes, cartilaginous fishes, and bony fishes. The three main groups are jawless fishes, sharks and their relatives, and bony fishes.
Ecology of Fishes: Most fishes spend all their lives either in fresh water or in the ocean. Most freshwater fishes cannot tolerate the high salt concentration in saltwater ecosystems, because their kidneys cannot maintain internal water balance in this environment. Some fishes live their lives in fresh water and then migrate to the ocean to breed.
Fishes are aquatic vertebrates; most fishes have paired fins, scales, and gills. The evolution of the jaws and the evolution of paired fins were important developments during the rise of fishes. Adaptions to aquatic life include various modes of feeding, specialized structures for gas exchange, and paired fins for locomotion.
Groups of Fishes: When you consider their basic internal structure, all living fishes can be classified into three groups: jawless fishes, cartilaginous fishes, and bony fishes. The three main groups are jawless fishes, sharks and their relatives, and bony fishes.
Ecology of Fishes: Most fishes spend all their lives either in fresh water or in the ocean. Most freshwater fishes cannot tolerate the high salt concentration in saltwater ecosystems, because their kidneys cannot maintain internal water balance in this environment. Some fishes live their lives in fresh water and then migrate to the ocean to breed.
Observations:
1. The general body shape of the perch is a oval, with a triangular tail attached to the end. The different fins shows the body's adaptions for life in the water.
2. One function of the gill rakers is to separate the gill arches from each other, and create spaces between each of the gill arches.
4. Thee scales of the perch face the tail. The scales allow the fish to move quicker.
5. A perch has two pairs of nostrils. (2 that you can see, and 2 that you can't see.)
6. Gills are an efficient respiratory organ because they create more surface area, and maximizes oxygen diffusion into the blood, and carbon dioxide diffusion out of the blood and into the water.
7. The lateral lines in a horizontal line that runs along the side of the perch. It's a system of sense organs found in aquatic vertebrates.
Critical Thinking and Application:
1. The endoskeleton is an advantage to these animals because an endoskeleton includes strong weight-bearing properties.
2. The guppy produces fewer eggs. The perch eggs have a slower survival rate because they're exposed to predators. The guppy has a higher survival rate because its eggs are protected.
3.The swim bladder helps the perch to control its buoyancy.
4. The luminescent fish have an advantage because they are able to produce a light producing organ. It's especially an advantage when they live deep in the ocean.
1. The general body shape of the perch is a oval, with a triangular tail attached to the end. The different fins shows the body's adaptions for life in the water.
2. One function of the gill rakers is to separate the gill arches from each other, and create spaces between each of the gill arches.
4. Thee scales of the perch face the tail. The scales allow the fish to move quicker.
5. A perch has two pairs of nostrils. (2 that you can see, and 2 that you can't see.)
6. Gills are an efficient respiratory organ because they create more surface area, and maximizes oxygen diffusion into the blood, and carbon dioxide diffusion out of the blood and into the water.
7. The lateral lines in a horizontal line that runs along the side of the perch. It's a system of sense organs found in aquatic vertebrates.
Critical Thinking and Application:
1. The endoskeleton is an advantage to these animals because an endoskeleton includes strong weight-bearing properties.
2. The guppy produces fewer eggs. The perch eggs have a slower survival rate because they're exposed to predators. The guppy has a higher survival rate because its eggs are protected.
3.The swim bladder helps the perch to control its buoyancy.
4. The luminescent fish have an advantage because they are able to produce a light producing organ. It's especially an advantage when they live deep in the ocean.