Cell that fuses with another during fertilization in organisms employing sexual reproduction, e.g., an egg or sperm cell.
Glossary: gamete
Glossary: Gammarus
Large genus of amphipod crustacean in the family Gammaridae of which members occur in both fresh and salt water. An important source of food for many fishes.
Glossary: gang valve
Plastic or metal, adjustable valve used to split a length of air line, and allowing two or more air-driven devices to be operated at once. Also known as an air-control valve.
Glossary: ganoid scale
Hard, shiny, enamel-like scale. Found in gars, bichirs and reedfishes, for example.
Glossary: gape
The width of the space between the jaws when open to their maximum extent.
Glossary: gape length
Straight-line measurement from the snout tip to the angle of the mouth.
Glossary: gas bladder
Gas-filled sac with 1-3 chambers, situated just below the vertebral column in most ray-finned fishes. Its primary function is to aid in buoyancy by offsetting the weight of heavier structures such as bone, but is also used for respiration or sound production in some species. Often reduced in benthic fishes and sometimes absent altogether. Also […]
Glossary: gastropod
Any member of the mollusc class Gastropoda.
Glossary: Gastropoda
Class of molluscs of which the majority of members possess a flattened, muscular foot for locomotion and a head bearing specialised sensory tentacles, with some also having a univalve, coiled shell. Includes all snails, whelks, limpets, conches, and slugs.
Glossary: gender
The condition of being male or female; sex.
Glossary: gene
Basic hereditary unit comprising a sequence of nuceleotides within a strand of DNA or RNA and occupying a fixed position on a chromosome. Generally determines a particular character or trait present in an organism by directing production and activity of RNA.
Glossary: genealogy
An account of the direct descent of an individual or group from an ancestor; study or investigation of the evolutionary development of an organism(s) from older, related forms; a record, chart, or table depicting a pattern of descent.
Glossary: genera
Plural of genus.
Glossary: general hardness
Measure of the overall concentration of calcium, magnesium and other ions in a water sample with values usually quoted in units of degrees (dGH), of which 1 dGH corresponds to 17.848 ppm. Also referred to as total or permanent hardness.
Glossary: generic name
The scientific name of a taxon with the rank of genus; the first part of a binomen or trinomen.
Glossary: genetics
Branch of biology concerned with the study of heredity and variation of organisms; the genetic constitution of a single organism, species, or other taxonomic group.
Glossary: genital
Of or relating to the genitals or the process of biological reproduction.
Glossary: genital papilla
Small tube arising from the urogenital opening in some fishes through which male or female gametes are expelled. May only be visible during the reproductive period depending on taxon. Its shape can sometimes used as a feature to identify the gender of an individual.
Glossary: genitalia
The reproductive organs, especially used in reference to external sex organs.
Glossary: genitals
The genitalia.
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
Product reviewers wanted
I’m interested in doing this if there is still availability, it sounds like fun! Thanks
19th Aug 2020
Barbodes semifasciolatus – Golden Barb* (Barbus sachsii, Puntius schuberti)
I simply had a question (please forgive if this is not allowed, I read the FAQ but I was not sure). I was wondering if there is any evidence of offsp...
12th Aug 2020