Why do some fishes lay so many eggs but other fishes lay only a few?

Why do some fish lay so many eggs at a time?

Rather, the rate of predation on fish eggs is high because they produce such a lot of eggs. Many fish produce thousands of minute eggs, each with an infinitesimally small chance of survival because this reproductive strategy in these species results in the highest number surviving to adulthood.

Why do some animals lay more eggs than others?

Clutch size in birds and reptiles has long been studied by biologists, who have found generally that species that are short-lived or have a low survival rate among their offspring tend to lay more eggs at one time to increase the chances of having surviving offspring.

How many eggs can fish have at one time?

An 8-inch fish may lay only 300 eggs, while the nest of a 12-inch nest may contain 1,000 eggs! Guarders: Some species of fish such as darters and catfish guard their eggs. Males will chase off predators.

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Why do most fish lay thousands of eggs at one time?

fish lays thousands of eggs because some of them are eaten by big animals and some of them don’t get enough Oxygen and some more things that they can’t grow , So fish has to lay many Eggs so that so of them becomes a new one.

Why do fishes lay hundreds of eggs together?

Animals like frogs and fish lay hundreds of eggs and release millions of sperms. … This is because the eggs and sperms get exposed to water movement, wind and rainfall. Also, there are other animals in the pond which may feed on eggs.

Why do some fish lay eggs and some give live birth?

The advantages of livebearing to the aquarist are that the newborn juvenile fish are larger than newly-hatched fry, have a lower chance of mortality and are easier to care for.

Which animal lay more eggs?

The mola, or ocean sunfish, looks like an animal cracker someone bit in half. At 5,000 pounds, though, this temperate and tropical water animal is the world’s heaviest bony fish. It’s also the heavyweight egg producer, releasing 300 million eggs over a spawning season.

Why do some sharks lay eggs and others don t?

In some shark species, the young developing inside their mother get their primary nutrients not from a yolk sac, but by eating unfertilized eggs (called oophagy) or their siblings (embryophagy). Some sharks produce a large number of infertile eggs for the purpose of nourishing the developing pups.

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Do male fish lay eggs?

The female lays the eggs, after which the male fertilizes them. The male fish keeps the eggs inside its mouth until they hatch. This protects the eggs from being eaten up by sea animals. What is a fish?

Can fish lay eggs without a mate?

Registered. As Charles stated, females can lay eggs without a male, however it requires the male to fertilize the eggs.

How long is a fish pregnant?

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.

Do small fish lay eggs?

Most types of aquarium fish lay eggs. If your fish is nesting, it may build a safe area for the eggs within the gravel. … According to Animal-World, the most common fish species that give birth to live fish are mollies, guppies, platies, and swordtails.

Do all fish lay eggs?

While most of the world’s thousands of fish species lay eggs, more than 500 species of fish reproduce by giving live birth.