Ichthyological terms, not general ones.
Coding system used to organise and refer to unidentified catfishes, though not necessarily undescribed or distinct species, of the genus Corydoras. Works in tandem with the similar CW number system. The system was invented by German aquarist Hans-Georg Evers and first appeared in the magazine 'DATZ' but is now in popular use worldwide.
Used in 67 profiles
Coding system used to organise and refer to unidentified catfishes, though not necessarily undescribed or distinct species, of the genus Corydoras. Works in tandem with the similar C number system. The system was invented by Ian A. M. Fuller in reference to his website 'Corydoras World' but is now in popular use worldwide.
Used in 65 profiles
Count of the number of scales encircling the narrowest part of the caudal peduncle.
Count often used in species descriptions and comparisons, made by counting the number of scales present around the narrowest part of the caudal peduncle.
Taxonomic rank into which a genus is divided, but otherwise difficult to delineate precisely with a single definition satisfying all eventualities still lacking to date. There exist a number of concepts of which the most popular in vertebrate taxonomy include the biological species concept and phylogenetic species concept.
Used in 1,790 profiles
Used in ichthyology to refer to the number of eggs deposited in a single spawning event, particularly when some form of nest is used.
Used in 10 profiles
Any of the bony processes located on the gill arch which function to either retain food items or otherwise prevent solid matter from entering the gill chamber. Vary in number and size depending on taxon and therefore useful in identification.
Used in 88 profiles
Pierced with a single or number of holes, characterised by perforation.
Used in 23 profiles
Containing a high number of species. Normally applied to a taxonomic group or specified geographical area.
Used in 177 profiles
A countable trait, e.g., the number of rays in a fin, gill rakers, lateral line scales, etc..
Used in 4 profiles
Blotch-like marking extending over the dorsal surface in certain fishes. Highly variable in number and form depending on taxon, and often used as an identifying feature.
Used in 49 profiles
Genus of unicellular ciliate protozoa with a shape resembling a grain of rice, a number of species of which are cultured as live food for small fishes and fry.
Used in 117 profiles
Net or plastic container suspended or floated in an aquarium and used to isolate gravid female livebearers or fry collected from the main aquarium. Available in a number of designs, with plastic ones generally containing two compartments separated by a grille or opening large enough that fry, but not adults, can pass through.
Having a number of parts, or divided into repeated, countable features; segmented; of or related to such characters.
Used in 13 profiles
In ichthyology, the counting of quantitative characters, such as the number of fins, fin rays or scales.
Used in 8 profiles
Dry corridor of savanna interrupting the West African rain forest and separating it into two parts known as the western Guinea and Central African Congo zones and reaching the Atlantic coast in Togo and Benin. Due to the separation, the resident flora and fauna of the Guinea and Congo zones differs to a significant extent. In terms of climate the gap has been wetter a number of times through history and has existed in its current state for around 4000 years.
Used in 6 profiles
Combining capacity of an atom or ion determined by the number of electrons that it will lose, add, or share when it reacts with other atoms; the bond-forming capacity of a given atom or radical; a numeric value designated to represent this capacity.
Generic term for any lake formed in a rift valley, but often used in specific reference to a group located in the East African rift, particularly those lying in its western and southern sections, i.e., the African Great Lakes. In the aquarium hobby the meaning of the term is typically restricted even further to include just lakes Malawi, Tanganyika, and Victoria, the latter of which is not in fact a rift lake and is located in a shallow depression between the eastern and western branches of the main rift. These three lakes are famous for the high number of endemic fish species inhabiting them, especially members of the family Cichlidae.
Any salt or ester of nitric acid, and the end product of the portion of the nitrogen cycle taking place in most closed aquarium systems (the conversion of nitrates to nitrogen gas in natural systems is carried out by anaerobic microorganisms not normally present in sufficient numbers in aquaria, though this process can be induced by installation of a nitrate reactor). While nitrates are less toxic than ammonia or nitrites, they are still potentially harmful to fishes and other aquatic organisms if allowed to accumulate unchecked, and must therefore be diluted via regular water changes. Aquatic plants also help since they are able to metabolise nitrates to an extent.
Used in 20 profiles
The number of more-or-less vertically-arranged scale rows present between the upper end of the gill opening and the caudal fin base. Sometimes referred to as vertical scale rows and used in meristic counts when the lateral line is absent, incompletely pored or otherwise difficult to distinguish.
Used in 9 profiles