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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 ...
A mature goldfish is more likely to eat directly from its owner's hand without evident hesitation. While this behavior is welcomed by goldfish owners, it may be problematic in outdoor ponds where predators may eat such friendly prey. Mature goldfish will also explore their surroundings through nibbling or grazing behavior.
The development of schooling behavior was probably associated with an increased quality of perception, predatory lifestyle and size sorting mechanisms to avoid cannibalism. [36] In filter-feeding ancestors, before vision and the octavolateralis system (OLS) had developed, the risk of predation would have been limited and mainly due to ...
“It’s just crazy to see something that, growing up, you go to the fair and you get a little goldfish in a bag. All of a sudden, you’re seeing one 14, 15 inches long,” he said.
Goldfish make trade-offs between their motivation to feed or avoid an acute noxious stimulus. A painful experience may change the motivation for normal behavioural responses. In a 2007 study, goldfish were trained to feed at a location of the aquarium where subsequently they would receive an electric shock.
Fish can learn how to perform a behavior simply by watching other individuals in action. [57] This is variously called observational learning, cultural transmission, or social learning. For example, fish can learn a particular route after following an experienced leader a few times.
Within the same laboratory populations of goldfish, some individuals may be spontaneously diurnal while others are nocturnal. [45] Goldfish can also be diurnal if food is more available by day, or nocturnal if food is available at night. [46] Salmon are mostly diurnal when temperature is high, but become more nocturnal if temperature plummets. [47]
Bubble Eyes have metallic scales, and they are similar to the celestial eye goldfish. [3] The eyes of the Bubble Eye goldfish are normal in the young fry but will start to develop eye bladders three months after hatching. [3] Like ranchu, the bubble eye goldfish lacks a dorsal fin and has a double tail. [4]