Leaf of the tree and shrub genus Quercus. Dried and used in aquaria to simulate certain natural conditions, especially those typical of blackwater habitats.
Glossary: oak leaf
Glossary: objective synonym
Each of two or more synonyms referring to nominal taxa with the same name-bearing type, or, in the cases of family-group and genus-group taxa, referring to nominal taxa with name-bearing types whose own names are themselves objectively synonymous.
Glossary: obligate
In biology, able to exist or thrive only under a certain set of environmental conditions, e.g., an obligate peat swamp-dweller.
Glossary: obtuse
Having a blunt or rounded tip.
Glossary: occipital
Of or related to the back of the skull or head; occipital bone.
Glossary: occipital bone
Median bone on the back of the head
Glossary: occiput
Back segment of the skull or head.
Glossary: ocellate
Possessing or resembling an ocellus or ocelli; having a spotted colour pattern.
Glossary: ocellus
Element of colour pattern resembling an eye; an eyespot or 'false' eye, often present in order to disorient predators.
Glossary: ocular
Of or related to the eye or sense of sight.
Glossary: od
Abbreviation of the term original description, sometimes used in non-scientific literature.
Glossary: odontode
Rigid, dermal structure resembling a tooth or bristle found in certain fish taxa, notably many neotropical catfishes. Also known as a dermal tooth and has a structure comparable to that of an oral tooth, with dentine surrounding a central pulp cavity covered by a superficial layer of enamel or similar material. Often more pronounced or extensively-distributed in […]
Glossary: oedema
Excess and subsequent accummulation of watery fluid in cells, tissues, or body cavities of an organism. Also spelled 'edema'.
Glossary: oesophagus
Muscular tube through which food passes from mouth to stomach in vertebrates; the gullet. Also spelled 'esophagus'.
Glossary: oil globule
Small, spherical droplet of oil found within the yolk sac of fish larvae. There may be one or more present and the size, positioning, and colour are also variable meaning they can be useful in terms of taxon identification.
Glossary: olfactory
Of, relating to, or contributing to the sense of smell.
Glossary: Oligochaeta
Class of annelids that includes earthworms.
Glossary: oligotroph
An organism able to live in oligotrophic environments.
Glossary: oligotrophic
Refers to bodies of water containing few nutrients and supporting little in the way of plant life. Opposite of copiotrophic.
Glossary: omnivore
An organism that consumes both plants and animals.
Laetacara curviceps – Dwarf Flag Cichlid (Acara curviceps, Aequidens curviceps)
The Laetacara curviceps will nibble on soft leaves of live plants as I have observed.
21st Jan 2019
Tetraodon miurus (Congo Puffer)
I own one of these guys and they are truly awesome. His name is Quagmire (given the squared-out jaw.) If you’re not keen on the idea of the fish bei...
5th Nov 2018
Poecilia reticulata – Guppy (Lebistes poecilioides, Girardinus guppii )
You recommend keeping this species with Rasboras, Tetras and Corydoras? Guppies do best in very high pH, while Tetras, Corydoras and Rasboras do best ...
1st Nov 2018
Aphyosemion striatum – Red-striped Killifish (Haplochilus striatus, Epiplatys striatus)
The default photo isn't indicative of how most populations of A. striatum look like in reality. That is a very washed out looking male in my opinion. ...
13th Oct 2018
Nothobranchius rachovii (Bluefin Nothobranch)
The image shown for "Captive-bred, adult male individual of the 'Beira 98' collection." is incorrect. That isn't a 'Beira 98' male. The picture is s...
13th Oct 2018