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Fresh water fish absorb water through their skin and gills, saltwater fish actually do drink water.

In saltwater fish, they have to drink because their body's concentration of salt is lower than the surrounding water. Therefore, they have to drink huge amounts of water every day to stay hydrated.

In freshwater fish, their salt concentration is higher than that of the surrounding water, and, as osmosis dictates, they absorb water through their highly permeable skin. To keep from bursting, freshwater fish actually have to excrete water, up to 10 times their body weight daily, unlike saltwater fish.

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I really dont know but if you ask your doctor she/or him will know all i have to say is to make sure just in case concern your doctor before taking action with the pukka fish

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No, they come out of a small tube under their body close to the tail fin called the ovipositor. There are, however, some fish commonly called "mouth brooders" that will either scoop up the eggs into their mouths and keep them there until they hatch or will keep the fry (baby fish) in their mouths until they're large enough to stand a better chance of surviving.

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if you freeze a fish and thaw it soon enough it might live. some animals can survive if u freeze them. e.g. a lobster will come back to life if u thaw it

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Depends on one's definition of cold. If by cold you mean sea-temperature, then yes there aren't many tropical fish who'd be fond of this. If you mean room temperature, there are many fish which will survive and indeed thrive in these conditions. Mountain-cloud minnows are particularly fond of the 18-24c temperature range and should freely breed in this.

If your aquarium water is too cold (20 would be too cold for a lot of common fish like guppies, platys and neon tetras for example) then the fish will be a lot less active in the tank, lose colour and swim with clamped fins.

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Many types of fish travel to saltwater to breed. The scientific term is Catadromous. An example of a catadromous fish is the Barramundi, but there are many catadromous species.

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Most baby salmon are called parrs, but they are also called smolt or grilse.
it doesn't have a name. it is just called a salmon.
a fingerling

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The best way is to do at least a partial water change - remove some old water & add fresh new.
In addition, you should check for too much debris or dead plants in the pond and remove them, and re-plant some fresh new plants.
If you have filtration for the pond, consider upgrading it, and lastly, if there are too many fish in the pond (which can happen), try to re-home some of them.

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If you are using live or deadbaits and you want to catch an average sized pike go for a rod with test curve of around 2.5 - 3lb (it will probably say this information on the rod). I usually use a carp rod for this job as it is the same a pike rod only it says "carp rod" on it instead. Also, they are easier to hold of for me. If your are lure fishing with small-medium lures then yet yourself a specified spinning rod with a spinning reel, and for jerk baits use a jerkiest or heavy lure rod and use with a 4000 sized fixed-spool reel or a multiplier.

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Large trout will eat small fish of any species.

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because it is under the sea with all different colors

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Shellfish are invertebrates.. Fish are vertebrates.

Essentially, clams, oysters and similar animals are shellfish.

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they just breathe it like a normal fish would normal water.

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3000-4000

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No, shad are in the herring family.

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Yes, also, frogs and crayfish.

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Starfish live in the sea. They need salty water.

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Salmon swim upstream because they are born in rivers, but salmon live in the North Atlantic ocean and the Pacific ocean, but salmon, once they have to lay their eggs they return to their birthplace. Since they were born in rivers ,and since rivers flow downstream into oceans, salmon must swim upstream to reach their birthplace in the rivers.

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Goldfish excrete like any other animal, or person, from it's anus. It's typical for a goldfish to excrete at feeding time due to having very small stomachs and having to make room for more food.

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Carp will bite many types of baits, including cheese. But in lakes where catfish species occur, the catfish will probably get there first, as cheese balls are great catfish bait. Try corn, or doughballs sweetened with strawberry or vanilla flavorings for carp.

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Feeder fish, small lancefish, goldfish or minnows if you can find them live. Also try blood worms, I find that large carniverous fish enjoy them and they are quite affordable and easy to store.

I had wild bluegill in my ponds and they did quite well eating whatever fell into the pond and/or tried to land on the surface. They also would eat koi food and goldfish flakes but they prefered softer food (didn't like hard pellets). They seemed to prefer to eat food on the surface.

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They will keep growing if they live in a large enough space, They may not grow as fast when they get older but they will grow almost until they die.

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Smolt, fry, fingerling, or parr are some names for immature salmon.

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Wetlands can refer to both freshwater and saltwater areas. Wetlands are simply an area of land where the soil is saturated with water, either fresh or salt. For example, freshwater marshes exist inland, whereas salt marshes generally occur along the coast.

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When fish go torpid, they stop feeding and slow body processes (almost like a kind of hibernation). They don't move much (or at all) and basically rest until the water warms up. This only happens when water temperatures reach near the freezing point. Most temperatures just above freezing, they will continue to feed on a limited and much less frequent basis, but still limit their movements.