Skip to main content

Table 3 Outcome categories and sub-categories used to measure a change in fish productivity

From: What are the effects of flow-regime changes on fish productivity in temperate regions? A systematic map

Outcome categoriesOutcome sub-categories and definitions
Growth (576)Mass (414)Mass, length; by age class
Condition (125)Condition (somatic)
Foraging (37)Foraging success e.g., mean energy intake,  % stomach fullness
Survival (159)Survival (95)Survival (beyond age 0)
Mortality (64)Mortality (beyond age 0)
Performance (individual) (114)Stress (16)Sub-lethal stress (only if direct response to altered flow) e.g., vent rate/respiration frequency, glutathione-S-transferase activity, catalase activity, activity of 7-ethoxyresorufin O-deethylase, cortisol/glucose levels
Energy (48)Activity level, energy expenditure (fish behaviour–movement in high/low flow), costs of swimming, any measure of metabolic rate (e.g., rate of energy expenditure per unit time) or indicator thereof in order to include changes in metabolism (e.g., field metabolism measured in carbon isotope 13)
Swimming (50)Swimming performance including ability to maintain position in different flows e.g., magnitude of thrust, swim speed/velocity
Migration (474)Passage (101)Metrics related to fish passage or success, including probability of migration over a dam or through migration route
Passage (survival) (12)Studies that consider loss or survival during passage
Speed (83)Migration speed, net ground speed
Abundance (211)Abundance or numbers of fish e.g., number of migrants (river entry), or number of successful migrants
Abundance (escapement) (67)Biological definition of escapement i.e., number of fish in a run/migration that are able to return to the spawning ground or other important habitat, that do not get stopped/removed by any barriers during migration and are available to support the population into future years
Reproduction (332)Maturation (13)Adult maturation success
Survival (84)Redds/nest, egg, larval, fry, age 0, YOY survival (inclusive)
Spawning (106)Spawning events e.g., number of spawning days, spawning periods, number of spawning adults
Spawning (abundance) (96)Egg abundance, number of eggs deposited/spawned, egg density during spawning (may include other age groups if directly linked to spawning)
Fecundity (33)Metrics related to fecundity
Productivity (2402)Biomass (239)Metrics related to biomass, yield
Abundance (1031)Abundance, density, CPUE (total numbers, of just 1 age class), presence/absence, number of eggs when eggs are considered an age class and not part of a spawning event
Abundance (escapement) (1)Fisheries definition of escapement i.e., the number of fish in a fishery that manage to get out of the fishery (leave the lake and are unavailable to fishers)
Diversity (567)Diversity, richness, composition
Structure (266)Age class structure of population (numbers for > 1 age class) or length-frequency distribution i.e., replication is not individuals
Population viability (22)Population viability, persistence, sustainability, genetic diversity (within species), number of hybrids (if linked to genetic diversity, otherwise hybrids are included like any other fish under abundance)
Recruitment (197)Recruitment metrics e.g., density of fry recruiting into adult population
Other (79)E.g., production, turn-over
  1. The number of cases per category and sub-category are shown in brackets