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Most fish species spawn eggs that are fertilized externally, typically with the male inseminating the eggs after the female lays them. These eggs do not have a shell and would dry out in the air. Even air-breathing amphibians lay their eggs in water, or in protective foam as with the Coast foam-nest treefrog, Chiromantis xerampelina.
The ram cichlid (Mikrogeophagus ramirezi) is a species of freshwater fish endemic to the Orinoco River basin, in the savannahs of Venezuela and Colombia in South America. [3] The species has been examined in studies on fish behaviour [4] and is a popular aquarium fish, traded under a variety of common names, including ram, blue ram, German blue ram, Asian ram, butterfly cichlid, Ramirez's ...
The spawn (eggs) of a clownfish. The black spots are the developing eyes. Spawn is the eggs and sperm released or deposited into water by aquatic animals. As a verb, to spawn refers to the process of freely releasing eggs and sperm into a body of water (fresh or marine); the physical act is known as spawning. The vast majority of aquatic and ...
The purpose of the grunting is unknown, but due to it being present in only mature males and during the spawning season, it is assumed to be linked to spawning. [4] [6] The freshwater drum is also called Russell fish, shepherd's pie, gray bass, [7] Gasper goo, Gaspergou, [8] gou, [8] grunt, grunter, [7] grinder, gooble gobble, and croaker.
Dead salmon, shortly after spawning. Live fish right after spawning will show the same white, rotting flesh shortly before death. Once the mature coho has reached three or four years old, it swims up freshwater rivers and streams to spawn (reproduce).
A grizzly bear ambushing a jumping salmon during an annual salmon run. A salmon run is an annual fish migration event where many salmonid species, which are typically hatched in fresh water and live most of their adult life downstream in the ocean, swim back against the stream to the upper reaches of rivers to spawn on the gravel beds of small creeks.
The mature and spawning adult fish have only been observed in the last quarter of the year in certain locations including Madeira, the Canaries, and the northwest coast of Africa. The gonadosomatic index is higher for the same body length in the black scabbardfish located around Madeira as opposed to off mainland Portugal or to the west of the ...
The quantity of food intake can be altered to influence spawning and maturity, for example low rations have been shown to reduce the number of fish reaching maturity while increasing the fecundity of those which do. [5] When fry are desired, spawning can be induced in broodstocks by manipulation of relevant environmental factors.