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    Question

    The feeding intensity of fish determined by calculating

    gastro-somatic index is equal to
    A (Weight of the stomach content/weight of the fish) × 100 Correct Answer Incorrect Answer
    B rate of growth of fish Correct Answer Incorrect Answer
    C weight loss by fish Correct Answer Incorrect Answer
    D None of the above Correct Answer Incorrect Answer

    Solution

    The gastro-somatic index (GaSI) is a crucial biological measurement used in fisheries science to assess:  1. Formula: 2. GaSI = Weight of stomach content / Total weight of fish ×100  3. Purpose:  a. Quantifies feeding activity and nutritional status  b. Helps determine optimal feeding schedules in aquaculture  c. Indicates ecosystem health in wild fish populations 4. Interpretation:  a. Higher GaSI = Active feeding phase  b. Lower GaSI = Fasting or starvation periods Scientific Basis: This index is standardized in fisheries research and recognized by:  • FAO fisheries technical papers  • ICAR (Indian Council of Agricultural Research) guidelines  • Journal of Fish Biology standards Practical Application: Aquaculture farms use GaSI to:  • Adjust feed quantities  • Identify disease outbreaks (abnormally low GaSI)  • Monitor breeding cycles (pre-spawning fasting) Regulatory Reference: The method aligns with MPEDA (Marine Products Export Development Authority) quality protocols for farmed shrimp and fish exports.  Note: For accurate results, measurements should be taken from live or freshly caught specimens before stomach contents degrade.

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