No.
No, a lamprey is not an amphibian. A lamprey is a fish, more specifically a jawless fish. It is one of the earliest forms of fish that is still alive today.
lamprey.
No, they swim. A lamprey out of water is as helpless as a fish out of water.
Yes, lampreys are cartilaginous fish.
Fish and chips can be kosher if it`s made with kosher fish in a kosher kitchen. In fact, it was Portuguese Jews who introduced fried fish to England.
Kosher fish have fins and scales. I've attached a related link that provides a comprehensive list of kosher fish.
Fish and chips can be kosher so long as the fish used is a kosher species and the food is prepared in a kosher kitchen with all kosher ingredients.
Yes, lampreys are cartilaginous fish.
The signs of a kosher fish are scales and fins. If the fish does not have either of these, then it is not a kosher fish. If it does, it is a kosher fish and one may eat it provided, of course, that it was prepared with kosher ingredients. According to "kashrut.com" (see link in related link section), the Grouper is indeed a kosher fish.
jawless fish
Pacific lamprey are not typically known to kill fish. They are parasitic feeders that attach themselves to other fish to feed on their bodily fluids. While this parasitic behavior may weaken the host fish, it is not common for the lamprey to directly kill the host fish.
An example of a jawless fish is the adult lamprey. The lamprey (scientific name : Agnatha) has a toothed, funnel-like sucking mouth.