Do fish sexually reproduce?
Nearly all fish reproduce sexually, and most species have separate sexes. Those without separate sexes avoid self-fertilization by producing sperm and eggs at different times. Each fish typically produces a large number of gametes. In most fish species, fertilization takes place externally.
What is difference between jawless and jawed fishes?
Fishes. Jawless fishes—the present day hagfishes and lampreys—have a distinct cranium and complex sense organs including eyes, distinguishing them from the invertebrate chordates. The jawed fishes evolved later and are extraordinarily diverse today. Fishes are active feeders, rather than sessile, suspension feeders.
How does a male fish fertilize eggs?
The fertilization can be done in a number of different ways; either by the male rubbing his sexual organs on the eggs, releasing sperm, or releasing sperm into the water to join the eggs in the zooplankton layer (if the eggs have been laid in that way).
Do bony fish reproduce sexually or asexually?
The majority of bony fish reproduce via external fertilization of their eggs. During spawning season for the fish, the females and the males release hundreds and sometimes thousands of eggs and sperm into the water.
How do female 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.
Do fish lay eggs from their mouth?
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.
How many eggs a fish can lay?
Siamese fighting fish: 100 – 500
What fish keeps their babies in their mouth?
Hardhead Sea Catfish The male holds the fertilized eggs in his mouth until they hatch, which can be as many as 80 days. Over the following two weeks, the fry will continue to use their father’s mouth as a means of protection when they feel threatened.
Do catfish carry babies in their mouth?
This is relatively rare, but is found among the cichlid genus Xenotilapia, and a single catfish, the spatula-barbled catfish (Phyllonemus typus). Typically, after courtship, the male fertilises the eggs and then collects them in his mouth, holding onto them until they hatch.
Do fish carry their babies?
Some aquarium fish carry the eggs inside of them. When the eggs are fertilized, they eventually hatch inside the mother, and the babies emerge in a live birth. You may not notice that any of this is happening until you see hundreds of tiny fish swimming around in your aquarium.