For a fish like the rockfish, does catch-and-release work? Check out the brochure from California Sea Grant. Part of the problem is separating the rockfish and knowing what you have. Even in the grocery store, multiple species have been lumped under the name rockfish, red snapper or rock cod. The rockfishes are neither true red snappers or types of cod, although several species may now be called red snappers. The fishes we refer to as rockfishes are the fishes in the genus and . Rock fish live near and at the bottom in the coastal region from the nearshore areas out over the continental shelf and down to about 800 m below sea level on continental slopes. Some like to live on rocky substrates. They are good sized fish for eating, for example the possibly threatened Canary rockfish grows to weigh about 10 pounds.
Fish digest their food in the stomach and intestine
Scientists have investigated what part of the body is responsible for maintaining the respiratory rhythm. They found that located in the of fish are responsible for the genesis of the respiratory rhythm. The position of these neurons is slightly different from the centers of respiratory genesis in mammals but they are located in the same brain compartment, which has caused debates about the of respiratory centers between aquatic and terrestrial species. In both aquatic and terrestrial respiration, the exact mechanisms by which neurons can generate this involuntary rhythm are still not completely understood (see ).
The plural of fish is usually fish, but fishes has a few uses
Most fish are food opportunists, or generalists. They eat whatever is most easily available. For example, the feeds on dead whales and nearly everything else that wriggles: other fish, , , , . prefer .
Fish are very diverse animals and can be categorised in many ways
Notice how we sometimes use the word "fish" and sometimes the word "fishes?" What's the difference? It's a little more complicated than singular and plural. Scientists use the word "fish" to refer to animals of the same species, regardless of whether there is one individual or 20 individuals. The word "fishes" is used to refer to a grouping of more than one species. For instance, if you had 20 yellowfin tuna, all of the species , you would refer to them collectively with the word "fish." If you had a yellowfin tuna, a salmon, and a trout, you would refer to this group with the word "fishes" because they are all different species.The vertebrae you are probably most familiar with (like our own!) consist of a spool-like centrum, which connects in front and back with other centra. On top of the centra are vertebral spines and arches to which muscle segments attach, and lateral to the centra are the ribs; these anchor muscles that flex as the animals move. Fishes swim with simple lateral motions, so their arches are relatively straight and needle-like, and so are their ribs. When you eat fish and pick out the bones, these are mostly what you're finding. Because fishes live in the water, gravity is not a big problem for them. But on land, a quadruped with a backbone between forelimbs and hindlimbs faces the same problems as a bridge designer: sag. As the fleshy-finned organisms began to venture onto land, they evolved a series of interlocking articulations on each vertebra, which helped them overcome sag and hold the backbone straight with minimal muscular effort.