Results for “várzea”

yolk sac viviparity

Form of livebearing in which the larvae are mostly nourished by a yolk sac which is fully-absorbed prior to birth.

urostyle

Upturned, posterior tip or backwardly-orientated process of the lower vertebral column, generally comprised of fused vertebrae; series of bones articulating with the last true vertebra; usually included when counting vertebrae.

Used in 8 profiles

lateral scale rows

The number of more-or-less vertically-arranged scale rows present between the upper end of the gill opening and the caudal fin base. Sometimes referred to as vertical scale rows and used in meristic counts when the lateral line is absent, incompletely pored or otherwise difficult to distinguish.

Used in 9 profiles

rift

Narrow fissure or zone of faulting formed via tensional stress in the earth's crust. When such forces are strong or prolonged enough to split the crust apart a central section will typically drop down or subside, sometimes forming a rift valley with steep walls as the gap widens. Water may become impounded in the valley, forming a rift lake.

Used in 5 profiles

tannin

Any of various yellowish or brownish solid compounds found in many plants and used for various commercial purposes. Derived from gallic acid and also known as tannic acid. Often present in water bodies with large amounts of decaying vegetation or where the underlying or surrounding soil contains peat and responsible for the typically brownish (tea-coloured) water in such environments and aquaria containing certain types of wood.

Used in 317 profiles

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

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

branchiostegal membrane

The membrane, sometimes referred to as the gill membrane, connecting the branchiostegal rays and enclosing the ventral portion of the branchial cavity. Normally extended when the opercle of a fish is open, sealing the branchial cavity and creating a vacuum in the mouth, and also used during threat, courtship and other communicative behaviours in many species.

Used in 5 profiles

chevron

A v-shaped line or stripe.

Used in 4 profiles

common name

Informal, vernacular name for a fish or other organism. Often varies by language, place or time.

Used in 104 profiles

epidermis

The outermost, protective, non-vascular layer of skin in vertebrates.

Used in 5 profiles

flake food

Commercially-produced, dried, artificially manufactured food for fishes maintained in aquaria or ponds. Usually comprises a combination of macro nutrients, trace elements and vitamins and may contain additional colour-enhancing, medicative or vegetable additives.

Used in 10 profiles

fungi

Kingdom of eukaryotic microorganisms lacking chlorophyll and vascular tissue and possessing chitinous cell walls. Highly variable in form and includes all yeasts, molds, and mushrooms.

Used in 1 profile

Gram's method

Method of differentiating bacterial species into groups based on the structure of their cell walls, using a particular, violet-coloured, staining technique.

grindal worm

Vernacular name for the annelid worm Enchytraeus buchholzi (Vejdovsky, 1879), a species commonly cultured by aquarists for use as live fish food. Smaller, more adaptable, and temperature-tolerant than the related white worm, Enchytraeus albidus Henle, 1937.

Used in 78 profiles

labyrinth organ

Highly folded, vascularised, suprabranchial accessory breathing organ formed via extension of the first epibranchial bone and used to respire atmospheric oxygen. Found in all members of the freshwater fish suborder Anabantoidei.

Used in 96 profiles

lateral line scale

Any visibly-pored scale of the lateral line system, counts of which are often used as an identifying feature.

Used in 164 profiles

nano aquarium

Small aquarium of arguable definition. Freshwater nano-aquaria are generally accepted to hold between 5-10 US gallons (4.16-8.32 UK gallons; 18.93-37.85 litres) whereas in the marine hobby any aquarium with a volume of 30 US gallons (24.98 UK gallons; 113.56 litres) is generally considered to be a nano-system. These definitions vary, however. Also known as a nano tank.

Used in 5 profiles

notch

Indentation or incision on an edge or surface. Usually v-shaped.

Used in 58 profiles

parahypural

Most ventrally-located of the hypural elements.