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  2. Oscar (fish) - Wikipedia

    en.wikipedia.org/wiki/Oscar_(fish)

    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.

  3. List of freshwater aquarium fish species - Wikipedia

    en.wikipedia.org/wiki/List_of_freshwater...

    Oscar: Astronotus ocellatus: 45 cm (18 in) Many people that purchase these fish do not realize that the fish could grow to a foot long (30 cm) within a year. Due to their fast growth rate and large size as an adult, they are often kept in aquariums that are too small for them. [45] 72-80 °F (22-27 °C) [45] 6.0-7.5 [45] Butterfly peacock bass

  4. Convict cichlid - Wikipedia

    en.wikipedia.org/wiki/Convict_cichlid

    Convict cichlids prefer moving water, and are most frequently found in habitats with cover in the form of rocks or sunken branches. [20] At four natural habitats of the convict cichlid in Costa Rica, the pH was found to range from 6.6–7.8, while carbonate hardness (KH) ranged from 63 to 77 ppm CaCO

  5. Freshwater environmental quality parameters - Wikipedia

    en.wikipedia.org/wiki/Freshwater_environmental...

    Freshwater environmental quality parameters are those chemical, physical and biological parameters that can be used to characterise a freshwater body. Because almost all water bodies are dynamic in their composition, the relevant quality parameters are typically expressed as a range of expected concentrations.

  6. Biotic Ligand Model - Wikipedia

    en.wikipedia.org/wiki/Biotic_Ligand_Model

    BLM depends on the site-specific water quality including such parameters as pH, hardness, and dissolved organic carbon. In this model, lethal accumulation values (accumulation of metal on the gill surface, in the case of fish, that cause mortality in 50% of the population) are used to be predictive of lethal concentration values that are more ...

  7. Recirculating aquaculture system - Wikipedia

    en.wikipedia.org/wiki/Recirculating_aquaculture...

    Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity. [1] Other types of filtration and environmental control are often also necessary to maintain clean water and provide a suitable habitat for fish. [ 2 ]

  8. Astronotus crassipinnis - Wikipedia

    en.wikipedia.org/wiki/Astronotus_crassipinnis

    Astronotus crassipinnis is a South American fish in the cichlid family from the southern Amazon basin and the Paraná–Paraguay basins. [1] It is not as well-known or common in the aquarium trade as its relative, the more northernly distributed oscar (A. ocellatus). [2] A. crassipinnis reaches up to 25 cm (10 in) in length. [1]

  9. Head and lateral line erosion - Wikipedia

    en.wikipedia.org/wiki/Head_and_lateral_line_erosion

    A red oscar that has died while showing HLLE. Head and lateral line erosion, (HLLE) or hole-in-the-head (HITH) is a disease in fish. Chronic ulcerative dermatopathy or chronic erosive dermatopathy are symptoms of similar conditions with different etiology.