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Female goldfish spawn (discharge) eggs into the water, encouraged by male goldfish who simultaneously discharge sperm which externally fertilizes the eggs Within two or three days, the vulnerable goldfish eggs hatch into larvae, and rapidly develop into fry Goldfish. Goldfish, like all cyprinids, are egg-layers. They usually start breeding ...
Goldfish are gregarious, displaying schooling behavior, as well as displaying the same types of feeding behaviors. Goldfish have learned behaviors, both as groups and as individuals, that stem from native carp behavior. They are a generalist species with varied feeding, breeding, and predator avoidance behaviors that contribute to their success ...
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Goldfish have a varied diet that can include pellets, flakes, vegetables, and blood worms. Overfeeding should be avoided as it can disrupt the biological balance and increase the risk of diseases. The recommended feeding amount is what the fish can consume in 2–3 minutes, once or twice a day, depending on the size of the fish.
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Visually similar structures to nuptial tubercles are produced by male loricariid catfishes during the mating season, in similar places to nuptial tubercles (snout and fins). These are actually hypertrophied odontodes , which are therefore dermal teeth, rather than keratin, and are covered by flesh containing taste buds.
When mating, the female seahorse deposits up to 1,500 (average of 100 to 1,000) eggs in the male's pouch, located on the ventral abdomen at the base of the tail. Male juveniles develop pouches when they are 5–7 months old. The male carries the eggs for 9 to 45 days until the seahorses emerge fully developed, but very small.
Synodontis multipunctatus, also known as the cuckoo catfish, combines mouthbrooding with the behavior of a brood parasite: it eats the host mouthbrooder's eggs, while spawning and simultaneously laying and fertilizing its own eggs. The mouthbrooder (typically a cichlid) incubates the cuckoo catfish young, the catfish eggs hatch earlier than the ...