Corrigendum to “The impact of flow and physical enrichment on preferences in zebrafish” [Appl. Anim. Behav. Sci. 215 (2019) 77–81, (S0168159119300383), (10.1016/j.applanim.2019.03.015)]

The authors regret that there is an error in the published version of ‘The impact of flow and physical enrichment on preferences in zebrafish’ Applied Animal Behaviour Science 215, 77–81. The equation used to calculate preference index, Jacobs Index, was calculated incorrectly. Jacob's Index is calculated with the formula, [Formula Presented] where r is the ratio of fish in zone X to the total number of fish in all zones and p is the available proportion of all zones in the experimental tank, in this case p = 0.20. Unfortunately, we did not include zone X in the calculation of total number of fish in all zones for r. Therefore, r was calculated incorrectly across all zones. The data has been recalculated using the correct formula and the same statistical analyses applied. The mean preference index for each zone was quoted in the abstract. We have included the correction to these values below. Two changes to the statistical output are also noted, along with a new Figure 3. All other statistical outcomes remain the same. Moreover, it is important to note that the switch rate was not affected by this error, and the error has not had any effect on the significance of the findings; all statistically significant results remain true. As such, the main conclusions of the paper are unaffected. Specific corrections: The published abstract reads, ‘Zebrafish showed a significant preference for the Enriched+Swimming zone (0.72 ± 0.08) but avoided both the Swimming only (−0.28 ± 0.04) and Plain (−0.31 ± 0.04) zones spending more time in the central arena (−0.02 ± 0.04). ’ With the corrected preference index values this should read, ‘Zebrafish showed a significant preference for the Enriched+Swimming zone (0.41 ± 0.05) but avoided both the Swimming only (−0.34 ± 0.04) and Plain (−0.37 ± 0.03) zones spending more time in the central arena (−0.13 ± 0.03).’. In the results, it was reported in the original article that, ‘zebrafish showed significant habitat preferences across all 18 replicate tanks (F_4,89 = 58.21, P < 0.01; Fig. 3)’. With the new statistical analyses, the F value is 57.89. The p-value remains the same. In the results, it was reported in the original article that ‘the Central Arena had a significantly higher preference index than Swimming only (P = 0.01)’. This should be corrected to P < 0.01. Finally, there is a typo in the abstract and methods; the flow rate of the pump was set to 14 cm/s not 14 m/s.