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How do fish lay their eggs? Fish lay their eggs either externally or internally, depending on the species. External egg-laying fish release their eggs into the water, where they are fertilized by the male’s sperm. Internal egg-laying fish, on the other hand, retain their eggs inside their bodies until they hatch. Do male fish lay eggs?
Cartilagenous fish (sharks, skates, rays, chimaeras) eggs are fertilized internally and exhibit a wide variety of both internal and external embryonic development. Most fish species spawn eggs that are fertilized externally, typically with the male inseminating the eggs after the female lays them.
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.
First, a male fish executes rituals to attract the female fish. After intercourse, the female carries the fertilized eggs inside of her body. The young then mature within the mother’s body and the eggs are then expelled. Examples of ovoviviparous fish include: tiger sharks, stingrays and giant rays.
Fertilized fish eggs develop into embryos, which use the yolk in the egg as food. After a period of development, the embryos become free-swimming. In fishes with internal fertilization, eggs may be released as newly developed embryos or larvae attached to a yolk sac that become part of the plankton.
In most externally fertilizing freshwater fish species, both males and females spawn synchronously by generating sufficient muscular contractions to ultimately produce an underwater plume of gametes containing approximately 10 billion spermatozoa and 3 million eggs (Wootton & Smith 2014).
External fertilization is a common reproductive strategy in aquatic species. Spawning behavior involves the synchronized release of eggs and sperm. The release of eggs and sperm is essential for successful fertilization in external fertilization.