How long do fish pregnancies last?

As examples, the female swordtail and guppy will both give birth to anywhere from 20 to 100 live young after a gestation period of four to six weeks, and mollies will produce a brood of 20 to 60 live young after a gestation of six to 10 weeks.

How often do fish have babies?

Depending on water conditions, temperature, and diet some livebearers can have broods as often as every four to eight weeks. You can tell if a female is ready to give birth by her enlarged abdomen or a dark spot located near her anal fin.

Do fish get pregnant?

In most cases, the female drops eggs in the water which are immediately fertilized by sperm from the male. Another way is for fertilization to occur within the females body before she drops them into the water. With the third and final method, the female retains the eggs within her body and the young are born alive.

How many baby fish survive?

But even under the best conditions, at least 70% of newly hatched fish still die. For example, the Tel Aviv researchers found that at Har Dag, a veteran fish farm in Eilat, typically 250,000 larvae survive from one million hatched eggs.

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How do you know if a fish is pregnant or fat?

Carrying Eggs – One reason your fish may appear slightly bigger is because it is carrying eggs. If your fish is a female, is not overly fat, and is normal in most other regards, this is a very high possibility. Another indication is if your fish has an enlarged vent; this is where the eggs will come out.

Do fish give birth out their mouth?

Sometimes the female fish will carry the fertilized eggs in her mouth, or the male and female will trade off, which is called biparental mouthbrooding.

Do fishes sleep?

While fish do not sleep in the same way that land mammals sleep, most fish do rest. Research shows that fish may reduce their activity and metabolism while remaining alert to danger. Some fish float in place, some wedge themselves into a secure spot in the mud or coral, and some even locate a suitable nest.

Where do the eggs come out of a fish?

The methods of reproduction in fishes are varied, but most fishes lay a large number of small eggs, fertilized and scattered outside of the body. The eggs of pelagic fishes usually remain suspended in the open water. Many shore and freshwater fishes lay eggs on the bottom or among plants. Some have adhesive eggs.

Why do male guppies chasing pregnant female guppies?

During mating season, male guppies either attract females with their brightly-colored bodies or harass smaller females into mating by nipping and chasing them. … Guppies, which constantly move between social groups in the water, form female pairs that help them improve foraging and protect them from predators.

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How do fishes sleep?

It’s pretty easy to tell when fish are sleeping: they lie motionless, often at the bottom or near the surface of the water. They are slow to respond to things going on around them, or may not respond at all (see some sleeping catfish here). If you watch their gills, you’ll notice they’re breathing very slowly.

How long fish can live?

Рыба/Продолжительность жизни

What percent of fish eggs survive?

High egg survival has been reported in three freshwater species which spawn in vegetation: 60-95 percent for northern pike (Franklin and Smith, 1963), 80-94 percent at high oxygen concentrations for carp (Nikolskii, 1969), and 34-90 percent for carp-bream (Nikolskii, 1969).

How many babies do platy fish have?

Wild varieties are drab in coloration, lacking the distinctive dark lateral line common to many Xiphophorus species. Platies can have from 20–50 fry (baby fish) at once, as often as once a month. They may also eat their own young.

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