Methods and systems for measuring growth rate in plant or aquatic animal species

A method comprising;

• a) introducing a redox indicator to each individual in a pool of mollusk at T0;
• b) producing a selection of mollusks by:
• i) measuring whole body metabolic rate of each individual in the pool, wherein metabolic rate is measured using a colorimetric/fluorescent redox assay comprising measuring a fluorescence value at time T0;
• measuring a fluorescence value at time T1 after time T0;
• and determining the change in fluorescence between T1 and T0 to determine a metabolic rate;
• and
• ii) selectively removing the individuals in the pool that had a metabolic rate in the 10% lowest metabolic rates of the pool from the remaining individuals in the group.

A system for preparing a selection of embryonic fish or juvenile aquatic organisms form a pool of embryonic fish or juvenile fish, said system measures whole body metabolic rate of each individual in the pool of embryonic fish or juvenile aquatic organisms;

• wherein metabolic rate is measured using a colormetic/fluorescent redox assay comparing introducing a redox indicator to the individual at time T0;
• measuring a fluorescence value at time T0;
• measuring a fluorescence value at time T1 after time T0;
• and determining the change in fluorescence between T1 and T0 to determine a metabolic rate;
• and produces a selection of embryonic fish or juvenile aquatic organisms by separating the individuals in the pool that had a metabolic tate in the 25%, 10%, or 5% highest metabolic rates of the pool from the remaining individuals in the group.