Ab.wacr.-The range of splionil Pngnrriclrrlr,r ~cmlcpido~ur has decrused to lcsr than r third of its original range due to loss or alleration of habitats. We measured the critical 1henn.l minima agement and rcstoralion of this species. Neither thermal acclimrtion nor fish weight affeaed the Gin (6.5-7.3W but CT,. (29-33'C) of fish acclimated at 17 and 20.t were higher than CT,. (21-22T) of fish acclimated a I2T. Mun CWmI. vdua were low (0.6-1.3 mg O2/L) for all age-group. although immature age-2 fish acclimated at 12Y: bad a low CWe. than my group acclimated at IPC. Mean CS,. (20-2%) did wc vary with acclimtion tempenlure, but incrud with inmasing weight for fish acclityted at 17-C. Mun time to loss of equilibrium in all ape-gmups zel~~lly deed as ulinitv in- a d wu ren~llv low for an4 firh 1 % Inauru in acclimation cempmturr by 3T for small.a4 fish.nd 5'12 for or-2 lirh.a dead-end sloughs. A *ck of wfficient-flooded &gelation for spawning.Id ruring, asnow envimnmenul tolcnmrr of Mher life rug- (i.~.. ew. larvae. and adult wwaen). a bimic factors (rg.. predation. competition) may be limiting splittail lbundracc and disuibution. The splittail pogonic&hys mncrolepidorus (Ay- rapid population decline, thesplittail waiproporad res 1854) is theonly surviving memberof its genus for listing as a threatened species under the Enan
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