reverse osmosis unit
Device used to purify water via the process of reverse osmosis. Some units combine both reverse osomosis and deionisation functions.
Used in 56 profiles
Results for “várzea”
Ichthyological terms, not general ones.
riparian
Of, inhabiting, or located on the bank of a river or other watercourse, e.g., riparian vegetation.
Used in 199 profiles
RNA
Abbreviation for ribonucleic acid, a single-stranded, self-replicating genetic material comprised of a chain of nucleotides. Present in nearly all living organisms, and replaces and performs the role of DNA in some viruses. Particularly important in protein synthesis and sometimes in transmission of genetic information.
robust
Strong; vigorous; sturdy. Often used to describe the general body form of a fish.
Used in 246 profiles
rudimentary
In biology, incompletely developed; embryonic; vestigial.
Used in 37 profiles
saddle
Blotch-like marking extending over the dorsal surface in certain fishes. Highly variable in number and form depending on taxon, and often used as an identifying feature.
Used in 49 profiles
saprolegnia
Genus of aquatic fungi, some species of which attack fishes. Normally a secondary pathogen attacking previously damaged tissue and causing cellular necrosis alongside other epidermal damage. Generally visible as a whitish or greyish filamentous fungus and thus commonly referred to as cotton-wool disease.
scapula
Paired bone attached to the pterygials, actinosts or radials of the pectoral fin. Articulates ventrally with the coracoid and anteriorly with the cleithrum.
seine
Type of net designed to hang vertically in the water with the ends being manually drawn together to catch fishes, and which usually has weights at the lower edge and floats at the top; to fish with such a net.
skeleton
In vertebrates, the internal structure composed of bone and/or cartilage that supports the soft tissues and protects the internal organs.
Used in 15 profiles
skin
In vertebrates, the thin, membranous layer of external tissue forming the protective covering of the body.
Used in 399 profiles
spawning migration
Migration of fishes to a spawning site or area, occurring in certain fishes. Variable in extent.
Used in 10 profiles
species
Taxonomic rank into which a genus is divided, but otherwise difficult to delineate precisely with a single definition satisfying all eventualities still lacking to date. There exist a number of concepts of which the most popular in vertebrate taxonomy include the biological species concept and phylogenetic species concept.
Used in 1,790 profiles
spine
See fin spine; also a hard, pointed, protective outgrowth or process elsewhere on the body, e.g., a preopercular spine; the spinal column of a vertebrate.
Used in 414 profiles
standard length
Measurement taken from the tip of the snout to the midlateral, posterior edge of the hypural plate or posterior edge of the last vertebra, thus excluding the caudal fin. May also exclude the length of the lower jaw should it project beyond the snout. It is the standard scientific measurement used for most fish species because the caudal fin easily becomes damaged in preserved specimens. Abbreviated to SL.
Used in 48 profiles
sting
Sharp, pointed, piercing organ normally formed from a modified spine and secreting venom from glands at its base when present in fishes; the act of stinging; the wound or pain caused by stinging.
Used in 110 profiles
strain
In ornamental fishes, a group of related individuals developed via selective breeding and sharing common features not present in other strains of the same species.
Used in 44 profiles
subterminal mouth
Mouth oriented and opening primarily forward but also somewhat ventrally, i.e., the upper jaw and snout clearly extend beyond the lower jaw
Used in 8 profiles
swamp
Low-lying, uncultivated wetland dominated by woody vegetation.
Used in 283 profiles
synonym
In zoological nomenclature, any of two or more names of the same taxonomic rank used to denote the same taxon. Names referred to as synonyms are not usually valid in the current sense.
Used in 204 profiles