Arabic term used to refer to a valley, stream-bed or other watercourse that only holds water during the rainy season. Often associated with oases and normally applied only in certain Arabic-speaking countries.
Glossary: wadi
Glossary: Wallace’s line
Hypothetical line, proposed by British naturalist Alfred Russel Wallace that marks the transitional boundary between the Oriental and Australian zoogeographical regions. It passes between the islands of Borneo and Sulawesi to its northern limit, Bali and Lombok to the south. To the west of the line organisms descended from Asiatic ancestors predominate, while to the […]
Glossary: warm water
Used in reference to water bodies with a temperature that exceeds 75.2°C/24°C during the summer.
Glossary: water column
Conceptual column representing the vertical section of a water body from surface to substrate.
Glossary: water table
The point below which the ground is saturated with water.
Glossary: watercourse
A natural or artificial channel through which water flows; a stream or river.
Glossary: watershed
An ridge or otherwise elevated piece of land that physically separates areas drained by different river systems. Also used to refer to an area or region drained by a particular river, river system, or other water body.
Glossary: wave maker
Electrical, often programmable, timing device that alternates power supply to multiple, submerged powerheads at predetermined time intervals. Most often used in marine aquaria to simulate natural wave action.
Glossary: Weberian apparatus
Anatomical structure connecting the swim bladder to the inner ear found in members of the fish superorder Ostariophysi. Conveys sound and changes in pressure, and comprises four or five modified vertebrae.
Glossary: Weberian ossicle
Any of the modified vertebrae comprising the Weberian apparatus in Ostariophysian fishes, individually named the claustrum, scaphium, intercalarium and tripus.
Glossary: Weberian vertebra
See Weberian ossicle.
Glossary: weir
Low dam constructed across a river to raise the water level, divert the water, or control its flow; series of traps or enclosures designed to catch fishes.
Glossary: Western Ghats
Mountain range extending southwards down the western side of India from the borders of Gujarat and Maharashtra states, through Maharashtra, Goa, Karnataka, Tamil Nadu and Kerala as far as Kanyakumari district in Tamil Nadu. The Ghats are a UNESCO World Heritage Site and represent one of the eight hottest hotspots of biological diversity in the […]
Glossary: wet/dry filter
Type of filter normally placed under the aquarium, and often home-made. The basic premise is that water trickles vertically downards through separated compartments containing mechanical and biological filter media with spaces inbetween so that it is also exposed to the air briefly. It then collects in a base chamber or sump from where it is […]
Glossary: wetland
Area of ground saturated with, normally shallow, fresh, salt or brackish water on a permanent or seasonal basis, e.g., marshes, bogs, swamps.
Glossary: white spot
See ich.
Glossary: white worm
Vernacular name for the annelid worm Enchytraeus albidus Henle, 1937, a species commonly cultured by aquarists for use as live fish food.
Glossary: whitebait
Collective term for the young of various fishes, especially herring and sprat. Sometimes used as food for predatory species in aquaria.
Glossary: whitewater
In ichthyological and aquarium literature typically refers to habitats with turbid water containing material in suspension and often rich in nutrients and dissolved ions, thus differing from clearwater or blackwater environments. Not to be confused with the term ‘white water’ which refers to turbulent water typically formed in rapids.
Glossary: wild-collected
In reference to aquarium fishes, caught in the natural habitat; not bred in captivity.
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