Table 1. Frequency of observed behavioural measures for each experimental treatment.

These include: number of interactions; average interaction time; cleaning bites; proportion of interactions with tactile stimulation; proportion of time spent providing tactile stimulation; frequency client jolts/100 s; and incidence of chases, for groups A and B; and percentage time spent near the smaller aquarium for groups C and D. Mean ± Standard Error (SEM) are provided for each behavioural measure.

Behaviour	Experimental treatments
	Group A (n = 8)	Group B (n = 10)	Mann–Whitney U test
Number of interactions	0.25 ± 0.16	22.1 ± 2.83	P < 0.0001*
Average interaction time	1 ± 0.75	6.68 ± 1.8	P = 0.0013*
Cleaning bites	0.12 ± 0.12	50.9 ± 5.64	P < 0.0001*
Proportion of interactions with tactile stimulation	0.62 ± 0.5	0.78 ± 0.1	P = 0.0623
Proportion of time spent providing tactile stimulation	0.15 ± 0.1	0.1 ± 0.02	P = 0.1329
Frequency client jolts/100 s	0	2.29 ± 0.79	P = 0.0007*
Incidence of chases	0.75 ± 0.53	1.1 ± 0.5	P = 0.4667
	Group C (n = 12)	Group D (n = 10)	Mann–Whitney U test
Percentage time spent near the smaller aquarium	0.25 ± 0.05	0.17 ± 0.08	P = 0.2498

Notes.

^*Statistically significant result.