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Please, can someone advise me on how I can approach my nominal data and test its significance.

I measured jerking movement as a behavioural effect in a fish exposed to each of Chemical A and Chemical B at different concentrations (or treatments) based on below metrics:

No effect = 1 Low effect = 2 Moderate effect = 3 High effect = 4

I want to now evaluate if there is a significant difference between effect of Chemical A from B. This is how the data look:

enter image description here

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You could do a chi-square analysis, but you probably have too few participants - you could try a Fisher's Exact Test, but again statistical tests work best with lots of respondents so you may have to rely on descriptives (crosstabulations) and graphs.

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This is not a nominal but ordinal data, hence I think kuskal wallis followed by man whitney will be more appropriate

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