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Salinity
- the level of dissolved salts in water; freshwater is usually less than 0.2% and seawater is over 3%
Scales
- covering of fish composed of dead material similar in substance to that which composes our fingernails; can be either cycloid (with smooth rear edges) or ctenoid (with serrated rear edges) in bony fishes
Scientific
nomenclature
- system of naming organisms, known as binomial nomenclature; use of Latin and two name (that of genus/species) to identify biological organisms.
Secretion
- the release of some substances from the blood
Spawning
- the act of reproduction in fish; the female lays the eggs and the male fertilizes the eggs by releasing milt (contains sperm)
Species
- a genetically distinct group, consisting of related individuals that resemble each other in appearance and behavior, and can breed among themselves but not, with some exceptions, with other species
Spleen - an organ within the digestive system which helps to removes waste products
from the blood.
Subsidiary
- a company controlled by another company
Swim bladder
- gas-filled air or swim bladder - located between the stomach and kidneys to help the fish maintain its buoyancy; a fish can alter the amount of gas (usually oxygen) in the bladder thus maintaining a chosen depth in the water without constantly swimming
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