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Aquaculture CH 7

Aquaculture Science - Chapter 7 Vocabulary

Acid A compound that yields hydrogen ions when dissolved in an ionizing solvent.
Aeration The mixing of air and water by wind action or by air forced through water; generally refers to a process by which oxygen is added to water.
Alkaline The term for a pH measurement above 7, basic.
Anaerobic Referring to a process or organism not requiring oxygen.
Anions Negative ions.
Beer’s Law The light passing through a colored liquid decreases as the concentration of the substance dissolved in the liquid increases.
Buffers Any substance in a solution that tends to resist pH change by neutralizing any added acid or alkali. A chemical that by taking up or giving up hydrogen ions sustains pH within a narrow range.
Cations Positive ions.
Colorimetric Determining the quantity of a substance by the measurement of the intensity of light transmitted by a solution of the substance.
Conductance The ability of a substance to allow the passage of electrical current.
Dissolved Oxygen (DO) The amount of elemental oxygen, O2, in solution under existing atmospheric pressure and temperature.
Effluent Water discharge from a rearing facility, treatment plant, or industry.
Equivalents per million (epm) A measure of ionized salts.
Fertilization The union of sperm and egg; addition of nutrients to a pond to stimulate natural food production.
Heat Capacity Characteristic of water making it resistant to temperature changes.
Heavy Metals Metals that may be toxic to fish, such as Cadmium (Cd), Cobalt (Co), Chromium (Cr), Copper (Cu), Lead (Pb), Lithium (Li), Manganese (Mn), Mercury (Hg), Nickel (Ni), Zinc (Zn), or Iron (Fe).
Hydroponics The cultivation of land plants without soil, in a water solution.
Ions Electrically charged atoms, radicals, or molecules.
Liming The use of lime to correct water with a stable or low pH.
Logarithm The exponent to which a base (usually 10) must be raised to produce a given number.
Microohms Measure of electrical resistance; one-thousandth of an ohm.
Organic Related to or derived from living organisms, contains carbon.
Parts per billion (ppb) A concentration at which 1 unit is contained in a total of 1 billion units. Equivalent to 1 microgram per kilogram (1 mcg/kg).
Parts per million (ppm) A concentration at which 1 unit is contained in a total of 1 million units. Equivalent to 1 milligram per kilogram (1 ml/kg) or 1 microliter per liter (1 ml/liter).
Parts per thousand (ppt) A concentration at which 1 unit is contained in a total of 1,000 units. Equivalent to 1 gram per kilogram (1 g/kg) or 1 milliliter per liter (1 ml/liter). Normally, this term is used to specify salinity.
pH An expression of the acid-base relationship designated as the logarithm of the reciprocal of the hydrogen-ion activity.
Salinity Concentration of sodium, potassium, magnesium, calcium, bicarbonate, carbonate, sulfate, and halides (chloride, fluoride, bromide) in water.
Salt Compound resulting from an acid and a base.
Saturation In solutions, the maximum amount of a substance that can be dissolved in a liquid without it being precipitated or released into the air.
Settling Pond Area where the solids settle to the bottom and the top water is released into the environment or a stream.
Solubility The degree to which a substance can be dissolved in a liquid; usually expressed as milligrams per liter or percent.
Thermal Stress Stress caused by rapid temperature change or stress caused by extreme high or low temperature.
Titrant The reagent or standard solution used in titration.
Titrimetric Analyses using a solution of known strength, the titrant, which is added to a known or specific volume of sample in the presence of an indicator. The indicator produces a color change indicating the titration is complete.
Turbidity Presence of suspended or colloidal matter or planktonic organisms that reduces light penetration of water.
Wastewater Water leaving a processing plant or production facility.
Water Hardness Measure of the total concentration of primarily calcium and magnesium expressed in milligrams per liter (ppm) or equivalent calcium carbonate (CaCO3).
Created by: UCT