Results for “od”

od

Abbreviation of the term original description, sometimes used in non-scientific literature.

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 males than females.

Used in 34 profiles

amphipod

A crustacean of the order Amphipoda, most of which are small and have a laterally-compressed shape. The suborder Gammaridea contains all freshwater species.

Used in 1 profile

andropodium

Modified, flexible anal fin rays present in males of some fish species (families Hemirhamphidae and Goodeidae) giving the fin a 'notched' appearance. Not used for insemination like the gonopodium in members of the family Poecillidae but to clasp the female during mating.

Used in 5 profiles

apode fishes

Fishes lacking pelvic fins.

arthropod

Any member of the phylum Arthropoda, these being characterised by a (usually) chitinous exoskeleton and segmented body to which jointed appendages are attached in pairs. Arthropods include the insects, crustaceans, arachnids, myriapods, and extinct trilobites, and comprise the largest phylum in the animal kingdom.

Used in 3 profiles

asexual reproduction

Mode of reproduction which does not involve fertilisation whereby offspring derive from a single parent and inherit genes only from that parent. Known in the Amazon Molly, Poecilia formosa, and some other fish species.

Berlin method

Method of biological filtration used in marine aquaria utilising live rock rather than a traditional, mechanical filter unit.

biodiversity

The number, variety, and genetic variation of organisms found within a specified geographic region, both within and between species and ecosystems. Often used as a measure of overall ecosystem health.

Used in 16 profiles

bloodworm

The freshwater larvae of certain midges which appear bright red due to their high haemoglobin content. Some species of the non-biting Chironomidae family are produced commerically for fish food with the larvae frozen or freeze-dried.

Used in 1,068 profiles

body depth

The vertical distance between the dorsal and ventral margins of the body measured at the base of the pectoral fin where it joins the body. In most icthyological works the greatest dimension, normally anterior to the dorsal fin, is taken but in some cases body depth is measured at the origin of pectoral, pelvic and first anal. Fins or fin bases are not included in the measurement, however.

Used in 85 profiles

bogwood

Non-petrified wood that has been preserved in a peat bog, often used as decoration in aquaria.

Used in 114 profiles

brood

Offspring of fishes, especially a single group hatching together and/or being cared for by the same parent(s); the act of tending and protecting eggs or offsping.

Used in 360 profiles

broodcare

The tending, caring for, and protection of a brood by one or both parents.

Used in 299 profiles

broodstock

A group of sexually mature fish maintained specifically for production of fry.

cavity brooder

Reproductive strategy characteristic of certain fishes, e.g., many cichlids, in which eggs in a cavity, cave or similar. The clutch is normally guarded aggressively by one or both parents. Such species may also be referred to as 'cave brooders/breeders'.

cephalopod

Any marine mollusc of the class Cephalopoda which includes octopus, squid, cuttlefish, and nautilus. Characterised by possession of a large head and eyes, prehensile tentacles, and, in most species, a specialised sac containing a dark, inky fluid used in defensive behaviour.

Chilonodella

Genus of unicellular, ciliated protozoa; some species are parasites of the skin and gills in freshwater fishes.

copepod

Any member of the subclass Copepoda, a group of small marine and freshwater crustaceans of which the planktonic species are important to global ecology, forming the main constituent of oceanic zooplankton. Some species are parasites of fishes.

Used in 6 profiles

decapod

Any member of the crustacean order Decapoda, comprising species possessing 5 pairs of jointed, thorassic limbs such as crabs, crayfish, lobsters and shrimp. Also used historically in reference to molluscs of the Cephalopod superorder Decapodiformes, members of which have 8 short limbs plus 2 longer tentacles and include cuttlefish and squid.