Table 4.
Study | Enrichment | Indicator(s) | Effect(s) |
---|---|---|---|
[35] | Aquarium backing with blue seascape design on rear tank wall | Aggression | No effect |
Body length | No effect | ||
Fertilisation success | No effect | ||
Egg production | ↑ | ||
[126] | Green, blue, yellow or red walls of tank | Preference (occupancy in enriched compartment) | Preference for green and blue over red and yellow. |
[133] | Green, blue, yellow or red walls of tank | Preference (occupancy in enriched compartment) | Equal preference for red and green over yellow; aversion to blue |
[128] | Green, red or blue doors in tank | Preference (choice of coloured door) | Preferred red over green; green over blue |
[129] | Transparent, black, white, yellow, red or blue tanks | Anxiety | ↓ in blue or black tanks compared with white or transparent tanks |
Cortisol | ↓ in blue tanks compared with white tanks | ||
[131] | Classical music (Vivaldi) | Anxiety | ↓ |
Cortisol | No effect | ||
[132] | Water current intended to provide tactile stimulation | Fear response after exposure to alarm cue | ↓ |
Cortisol | ↓ | ||
Recovery of normal behaviour after exposure to alarm cue | ↑ | ||
[82] | Airstone creating bubbles in water | Preference (occupancy in enriched compartment) | Preference for barren |
↑ = increase; ↓ = decrease.