Gonadosomatic index

The Gonadosomatic index (pronunciation: go-nad-o-so-matic index, etymology: derived from the Greek words 'gonia' meaning seed, 'soma' meaning body, and 'index' indicating a measure) is a biological index used in fisheries science and aquaculture. It is a measure of the reproductive status of fish or other aquatic organisms, calculated as the ratio of gonad weight to total body weight, usually expressed as a percentage.

Calculation

The Gonadosomatic index is calculated using the following formula:

GSI = (Gonad weight / Total body weight) * 100

Where:

Gonad weight is the weight of the gonads, measured in grams.
Total body weight is the weight of the organism, also measured in grams.

Usage

The Gonadosomatic index is used to determine the reproductive cycle of fish and other aquatic organisms. It provides information about the timing of spawning, the reproductive potential, and the effects of environmental factors on reproduction. The GSI is often used in conjunction with other biological indices, such as the hepatosomatic index and the condition factor, to provide a comprehensive picture of an organism's health and reproductive status.

Related Terms

Gonad: The organ that produces gametes in animals.
Spawning: The process of producing and releasing eggs in aquatic organisms.
Hepatosomatic index: An index used to measure the relative weight of the liver in fish and other aquatic organisms.
Condition factor: A measure of the overall health and well-being of a fish or other aquatic organism.

External links

Medical encyclopedia article on Gonadosomatic index
Wikipedia's article - Gonadosomatic index

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Gonadosomatic index