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.
Glossary: valence
Glossary: valid name
The correct, currently-accepted scientific name for a taxon.
Glossary: variant
A form or version that differs in some respect from other forms of the same thing or deviates from a standard.
Glossary: variegated
Exhibiting differently coloured markings; diversified.
Glossary: várzea
Type of seasonally-inundated floodplain forest in the Amazon region. The term is normally used for those forests flooded by whitewater rivers but is sometimes used to refer to blackwater environments for which the more traditional term is igapó.
Glossary: vascularised
Containing vessels that carry or circulate fluids, especially blood.
Glossary: vegetative
Of, relating to, or capable of growth, or functioning in processes such as growth or nutrition rather than sexual reproduction.
Glossary: Velvet
See ‘Oodinium‘.
Glossary: venom
Poisonous fluid secreted by various animals, including some fishes.
Glossary: venomous
Secreting venom; able to inflict a poisonous bite, sting or wound.
Glossary: vent
Excretory opening of the digestive tract in fishes.
Glossary: ventral
Of, on, or relating to the underside of an animal or plant; abdominal.
Glossary: ventral disc
A sucking disc formed by the pelvic fins in certain fishes.
Glossary: ventral keel
Fleshy, longitudinal ridge running along the abdomen and caudal peduncle in some fishes.
Glossary: ventral margin
Lower edge or margin.
Glossary: ventral-fin
Either of the pair of fins, also known as pelvic fins, attached to the pelvic girdle in fishes that help control the direction of movement. Correspond to the hind legs in higher vertebrates and vary in position depending on taxon. Sometimes absent entirely.
Glossary: ventral-fin basket
Vernacular nerm used to describe the post-spawning behaviour of cupping or clamping of the ventral fins in order to transport fertilised eggs. Exhibited by females of some Corydoras species, for example.
Glossary: ventrolateral
Positioned or orientated between the ventral and lateral surfaces.
Glossary: ventrum
Relating to or situated on or close to the abdomen or lower surface of an animal’s body; abdominal
Glossary: vermiculate
Having a pattern consisting of irregular, worm-like lines.
Major Changes in New World Cichlid Taxonomy
Reclassification of Genera: Several genera have been reclassified or merged. For example, the genus Cichlasoma has been split into multiple genera, an...
6th Nov 2024
Aphyosemion rectogoense
Many thanks cyprin, the image has now been removed.
31st Oct 2024
Product reviewers wanted
Hello! Very much interested in writing for you, please include me in the info. Thank you for the opportunity!
6th Sep 2020
Product reviewers wanted
I would be interested in reviewing products. Before retiring I was a technical writer and managed a Quality Management Program.
30th Aug 2020
Product reviewers wanted
I'm interested and can write reviews from the perspective of someone new to the hobby. I'm only 3-4 months in, but hopefully I can help someone that's...
23rd Aug 2020