Natural mortality (M)

Natural mortality (M)

Deaths in a fish stock caused by predation, pollution, senility, etc., but not fishing.

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Part of Speech: noun
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Industry/Domain: Fishing
Category: Fish farming
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natural mortality (M)

Fishing; Marine fishery

1. Deaths of fish from all causes except fishing (e.g. ageing, predation, cannibalism, disease, and perhaps increasingly pollution). It is often expressed as a rate that ...

natural mortality (M)

Fishing; Fish farming

Deaths in a fish stock caused by predation, pollution, senility, etc., but not fishing.

conditional natural mortality rate

Fishing; Fish farming

The fraction of an initial stock that would die from causes other than fishing during a year (or season), if there were no fishing mortality.

instantaneous rate of natural mortality

Fishing; Fish farming

When natural and fishing mortality operate concurrently it is equal to the instantaneous total mortality rate, multiplied by the ratio of natural deaths to all deaths.

mortality

Pollution control; Air pollution

Death rate.

mortality

Forest products; Forest engineering & harvesting

Number or sound wood volume of healthy trees that have died from natural causes during a specified period.

bycatch

Fishing; Fish farming

Bycatch (or by-catch) is the portion of a fishing catch caught unintentionally in a fishery, in addition to the targeted catch, and discarded as unwanted or commercially unusable.

fishery

Fishing; Fish farming

The industry or occupation devoted to the catching, processing, or selling of fish, shellfish, or other aquatic animals.

biological filtration

Fishing; Fish farming

These filters make use of bacteria to break down wastes in the water into substances which are less toxic to the inhabitants, in a process known as the nitrogen cycle. Examples ...

biological reference points

Fishing; Fish farming

Fishing mortality rates that may provide acceptable protection against growth overfishing and/or recruitment overfishing for a particular stock. They are usually calculated from ...

biomass

Fishing; Fish farming

Measure of the quantity, usually by weight in pounds or metric tons (2,205 pounds = 1 metric ton), of a stock at a given time.

brackish

Fishing; Fish farming

Water that part-way between freshwater and marine. A number of species prefer partly-salty water.

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