**annual natural mortality rate** — annual mortality rate (the ratio between the number of fish which die during a year from causes other than fishing and the number alive at the beginning of that year. Also called conditional natural mortality rate and seasonal natural mortality… … Dictionary of ichthyology

**mortality rate** — 1) the rate at which the numbers in a population decrease with time due to various causes. The proportion of the total stock (in numbers) dying each year is the annual mortality rate. To facilitate calculations, mortality is expressed as an… … Dictionary of ichthyology

**mortality rate** — the incidence of death in the population in a given period. The annual mortality rate is the number of registered deaths in a year, multiplied by 1000 and divided by the population at the middle of the year. See also: infant mortality rate,… … The new mediacal dictionary

**Mortality rate** — Crude death rate by country Mortality rate is a measure of the number of deaths (in general, or due to a specific cause) in a population, scaled to the size of that population, per unit time. Mortality rate is typically expressed in units of… … Wikipedia

**annual total mortality rate** — (seasonal total mortality rate) The number of fish which die during a year (or season), divided by the initial number. Also called: actual mortality rate, coefficient of mortality … Fisheries — dictionary

**annual total mortality rate** — the number of fish which die during a year divided by the initial number. Also called actual mortality rate, coefficient of mortality. Abbreviated as A … Dictionary of ichthyology

**actual mortality rate** — annual mortality rate … Dictionary of ichthyology

**fishing mortality rate** — the fraction of an initial stock which would be caught during the year (or season) if no other causes of mortality operated. Usually expressed as an instantaneous rate (the percentage of fish dying at any one time) and can reach 2.0 or higher.… … Dictionary of ichthyology

**seasonal total mortality rate** — the number of fish which die during a season from causes other than fishing divided by the initial number (Ricker, 1975). Also called annual mortality rate, annual natural mortality rate, conditional natural mortality rate, seasonal natural… … Dictionary of ichthyology

**seasonal fishing mortality rate** — conditional fishing mortality rate (the fraction of an initial stock which would be caught during the year (or season) if no other causes of mortality operated (Ricker, 1975). Also called annual mortality rate. Abbreviated as m) … Dictionary of ichthyology