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The oscar (Astronotus ocellatus) is a species of fish from the cichlid family known under a variety of common names, including tiger oscar, velvet cichlid, and marble cichlid. [2] In tropical South America, where the species naturally resides, A. ocellatus specimens are often found for sale as a food fish in the local markets.
Fish with low inbreeding showed almost twice the aggressive pursuit in defending territory than fish with medium inbreeding, and furthermore had a higher specific growth rate. A significant effect of inbreeding depression on juvenile survival was also found, but only in high-density competitive environments, suggesting that intra-specific ...
This behavior is also found in bats, and may lead to an understanding a similar mechanism humans use to turn down their ear sensitivity to retain their hearing longer. [14] There are conserved patterns of vocal, auditory, and neuroendocrine mechanisms between teleosts and tetrapods , which include midshipman fish and humans, respectively.
Inbreeding in fish is the mating of closely related individuals, leading to an increase in homozygosity. Repeated inbreeding generally leads to morphological abnormalities and a reduction in fitness in the offspring. In the wild, fish have a number of ways to avoid inbreeding, both before and after copulation.
Several studies have found that small male fish will look and behave like the female of their species in order to gain access to female territory and copulate with them. [5] [6] In the fish family Blenniidae, the female Salaria pavo will show a specific colour pattern and movement when they want to approach a male and copulate with him. The ...
A meta analysis of 27 species found that qualities such as lekking size, male display rate, and the rate of male aggression exhibit positive correlation with male success rates. [1] A positive correlation was also found between attendance, magnitude of exaggerated traits, age, frequency of fights, and mating success. [ 1 ]
2. Hoppin’ John. Southerners are usually eating Hoppin’ John (a simmery mix of black-eyed peas and rice) on New Year's Day. Like most “vegetable” recipes from around this area, it contains ...
Cooperative breeding occurs across taxonomic groups including birds, [5] mammals, [6] fish, [7] and insects. [8] Costs for helpers include a fitness reduction, increased territory defense, offspring guarding and an increased cost of growth. Benefits for helpers include a reduced chance of predation, increased foraging time, territory ...