Gas retailers, though, grouse that Costco uses gas as a loss leader to get people into the store. Even though Costco has just 0.16% of the 170,000 places you can fill up your car in the United States, its model is roiling the industry.
The release of fish eggs and their subsequent fertilization is called spawning. Most marine fish reproduce by releasing thousands of small eggs into the water for external fertilization. Egg-laying fish have a variety of methods for releasing the eggs. Some fish scatter eggs, which are fertilized by the male fish as they fall. Other fish attach the eggs to a surface, where they are then fertilized as they are released. Some fish release eggs into a nest of bubbles blown by the male fish.
With gynogenesis in fishes the offspring consists only of females, and the roe is inseminated by sperm of closely related species. Thus, roe of the silver crucian may be inseminated by the sperm of the carp, the roach, the crucian carp, the goldfish, tench, loach, or other cyprinoid fish.