The majority of fish reproduce by spawning, a process in which the female and male fish release eggs and sperm simultaneously in a protected environment with or without a complex courting ritual. Some spawners build nests to guard the fertilized eggs.Know More
Apart from building a nest, some spawners carry their embryos and their young around with them, while some, like the substrate spawners, scatter the eggs in the environment and do not guard the eggs or their young after spawning.
Live-bearing fish, which make up about 1 percent of all known fish species, mate to reproduce. The male inseminates the female through a modified fin called a gonopodium. The female livebearer stores the male's sperm and produces several broods of young fry, or newborn fish, from this single insemination.Learn more about Biology
The female gamete is called the egg or ovum. The female gamete is fertilized by the male sex cell, called the sperm, to begin the process of reproduction.Full Answer >
Fish require oxygen for survival just like other animals, but they filter it from water using specialized organs called gills. A fish draws in oxygen-rich water and passes it through its gills. The organs absorb the oxygen from the water, carrying it into the fish's bloodstream for use by its organs.Full Answer >
It is possible to tell the difference between male and female urine. Though urine is mostly water, it also contains elements like sodium, calcium and magnesium and compounds like fatty acids, carbohydrates and hormones.Full Answer >
Facilitated diffusion is considered passive transport because substances pass through a cell membrane with the assistance of a protein carrier, and no cellular energy is used in this process. Solutes use facilitated diffusion to move from areas of higher concentration to areas of lower concentration.Full Answer >