Fig. 1
From: Acute toxicity of ammonia and nitrite to Siamese fighting fish (Betta splendens)
Changes in ammonia and urea excretion rates over time in Betta splendens exposed to 90 mM ammonia (urea excretion: filled inverted triangle, n = 5) and in the control fish (urea excretion: open circles; ammonia excretion: filled circles, n = 6). Values are means ± standard error. An asterisk indicates a significant difference (P < 0.05) from the corresponding control urea excretion value