Environmental Tolerances and Requirements of Splittail

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Abstract
The range of splittail Pogonichthys macrolepidotus has decreased to less than a third of its original range due to loss or alteration of habitats. We measured the critical thermal minima (CTmin) and maxima (CTmax), critical dissolved oxygen minima (CDOmin), critical salinity maxima (CTmax), salinity endurance, and critical swimming velocity (U crit) for age-0 (0.1–4.0 g), age-1 (10–48 g), and immature age-2 (72–201 g) splittails to assist in effective water and habitat management and restoration of this species. Neither thermal acclimation nor fish weight affected the CTmin (6.5–7.3°C), but CTmax (29–33°C) of fish acclimated at 17 and 20°C were higher than CTmax (21–22°C) of fish acclimated at l2°C. Mean CDOmin values were low (0.6–1.3 mg O2/L) for all age-groups, although immature age-2 fish acclimated at 12°C had a lower CDOmin than any group acclimated at 17°C. Mean CTmax (20–29‰) did not vary with acclimation temperature, but increased with increasing weight for fish acclimated at 17°C. Mean ...

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