Fish

no

The answer is 1 based on the fact you used the word "a" meaning one. I assume however you refer to the total population of the Broadbill Swordfish which is popular for sport fishing and once feared endangered. The problem is that for most non-mammalian ocean species, direct population measurement is replaced by frequency of encounter (non commercial species) or fishing yields when deciding to declare a species endangered. For most ocean dwelling species it is technically impossible to count and track all individuals in all their territories -- or even approximate that in most cases. Except of course those species tied to the actual surface of the ocean such as airbreathing mammals and a few species that can only survive in the direct sunlight of the top few feet of the ocean surface. For all other species the problem is that the ocean is 3D, not a simple surface like land, which greatly increases the territory in which a species can be found. Further, the ocean is generally a hostile environment to humans in which we can not freely move about and observe. In fact the vast majority of the ocean is open to only handful of humans in submersibles for a few moments of each year. So actually a species merely needs to change its habits to cause a change in its assessed endangerment -- even though in actuallity there is no proof that the number existing has changed. If a species is no longer caught by fishers going to the traditional locations and using the traditional bait and means of catching them...well that fish species is now endangered. If a change in habits makes that species practically jump into a fisherman's net, lines or traps...well suddenly we assume the species has rebounded and is not endangered. However you may find a few expert specialists in a given species willing to make a WAG (Wild Ass Guess) as to "big number" (as in thousands, millions, billions) population based on a whole lot of assumptions. Such assumption might include size of territories and number of fish per volume or the assumptions might be based on spawning rates, availability of prey species, and time to grow versus success rates of commericial fisherman. But likely such experts would different in the details and still ultimately look back to rates at which fishermen harvest or destroy these species. Here is an example of how such WAGs are made & why you cannot put actual numbers on the swordfish population http://www.bigmarinefish.com/swordfish.html

Fish preservation is important because if we don't preserve them, they will become extinct. We won't have any fish for food and the Earth will once again have lost a wonderful animal species.

"Jaws are believed to have evolved from the first pair of gill arches of agnathans. The second pair of gill arches became support structures for the jaws." - Biology Laboratory Manual, Ninth Edition Darrel S. Vodopich and Randy MooreSo, sharks have fewer gill slits because the first two pairs became the jaw and the structural support for the jaw.

they swim,and they were called dogfish because they hunted in packs.

it is a clownbrate no its not who ever put this is dumb as hell its vertebrate

This is very difficult. It's done through "venting." The vent is the opening between the anus and the anal fin where the fish will excrete either eggs or sperm. Usually the vent is larger in females. It raelly just depends on the type. In some cases, if there is an "egg spot" on their anal fin, it means that the fish is male.

i dont know foo dont ask me man

We'll have to wait to 2048 to find out, unless you can see the future?

carnivores they eat stuff like krill and zooplankton

I usually consider 4 oz as a serving

They just see to their young until hatched. After that, the kid are on their own.

Yes, but they breathe air too, thru the labyrinth organ. In fact if you don't let them get to the top of the tank they can suffocate.

Puffer fish and blowfish are two common names for the same group of fish species belonging to the family Tetraodontidae. These fish are known for their ability to puff up by ingesting water or air to deter predators. The term "puffer fish" is more commonly used, while "blowfish" is sometimes used to refer specifically to the Japanese puffer fish species Fugu.

once upon a time ,

there was a boy and there was pee-pee i the shower.He had to find out who did the pee-pee?So he looked for clues.there where no clues in the house.then the boy went in a rocket ship and went to the moon. he saw an alien. he asked did you do a pee-pee in my shower?yes yes I'm sorry i did that.thats OK said the boy.the boy went back home and got a ignoramus bag and cleans up the pee-pee.then the boy went upstairs and watched blues clues on his TV.Then the boy started to play on his computer.he played a game called phun he got tierd then went upstairs to bed.he fell asleep fast.

The Sardine is a Herring like fish , that happens to have 7 letters , in it's name .

Jellyfish simply dont eat plants, mostly algae, or other things like that.

Swordfish during early juvenile stage of life (up to 8 inches long), have "scales" that are markedly specialized and rather unique. They are in the form of bony tubercules or expanded compressed platelike bodies. These scales are rough, having spinous projections at the surface and they do not overlap one another as the scales in most fish do. With growth the scales disappear and the adult fish including those sold commercially have no scales

Many fish in a group trying to stick together to protect each other. Just like a pack of wolves or a pray of lions. To protect themselves and others.

Yes. Some central European nations salt them.

They both make the plant and fish breath

The Tiger barb is a semi-aggressive species and they will form a social order. This social order can be extended to include other fish as well. The amount of fish that you keep in your aquarium depends on the size of your aquarium and the size of your fish when they are full grown. Injured fish should be quarantined since the Tiger barbs can attack wounded fish. Fish with large or exceptionally long and flowing fins are not recommended in the same aquarium with Tiger barbs.

The Tiger barb will usually become mature enough to mate when it reaches a length of about 1 inch or 2.5 centimeters long, and this will typically happen when the fish is about seven weeks old. I have successfully mated Tiger barbs.

To determine if Tiger barbs are male or female, the female Tiger barb is larger than the male which has a rounder belly and they have a distinctive red nose, and above the black part of his dorsal (back) fin you can see a red line that is characteristic of the Tiger barb. The dorsal fin of the female is mainly black. In most of the fishworld, the male is usually more colorful than the female.

If you want to breed freshwater Tiger barbs in your aquarium, the best method is to keep a group of Tiger barbs together and let them form their own pairs. They are egglayers. Some fish like black mollies are livebearers. When egglaying fish are ready to spawn, they usually build a bubble or foamy safe place to lay their eggs. Because fish eat their own or other fish eggs, these foamy safeplaces should be in a breeding tank or a seperate tank. Removing the adult fish after spawning is really recommended

John Dory eat a variety of small schooling fish. The are poor swimming and rely on the element of surprise to catch their prey.

Fish mostly live in bodies of water such as oceans, rivers, lakes, and streams. They can be found in various habitats within these bodies of water, including deep ocean waters, coral reefs, and shallow freshwater streams. Each species of fish has specific requirements for water temperature, pH levels, and food sources that determine where they are found.