What is Egg laying in Fish breeding Strategies?
Usually, egg layers have many methods to lay eggs.
Egg layers, usually scatter eggs around weeds, or onto gravels. The male fish chases the female fish during spawning and the eggs are fertilized as they fall. Some of the examples of egg scatterers are tetras, barbs, Rasboras and Danios.
Substrate spawners are the ones which would be very choosier about where they put the eggs. They lay eggs, which attach to some sort of substrate. Rocks, plants, wood and even the glass of the aquarium will also be chosen as a spawning site. Both male and female fish participate in fertilizing, where the male fish fertilizes the eggs and the female lays them. Few examples of substrate spawners are many catfish, few cichlids and killifish.
Bubbliest builders lay their eggs in a nest of bubbles blown by the male fish. The bubbles are held together with saliva and look like foam. They attract the infusoria that the babies can eat, and keep the eggs at the surface of water, where they are well-oxygenated. Few examples are laid at a time and placed carefully in the nest where the latching takes place. Few examples of Bubbliest builders are bettas and gouramis.
Mouthbrooders are the ones which actually lay eggs in their mouths until the eggs are hatched. Few eggs at a time are laid and once the male fish fertilize them, the parent, which is doing the mouthbrooding gathers them in his/her mouth. The parent eats very sparingly until the baby fishes are released. Examples of mouthbrooders are male arrowanas and female cichlids.
Marine fish also lay eggs. Some are substrate spawners, but many lay eggs that float in the plankton. The eggs latch into a larval stage and the larvae float freely and eat tiny plankton until they grow into fish.