The contribution of dissolved glucose to respiration in late larval and early postlarval stages of four penaeid shrimp species



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Respiration rates were determined for several developmental stages of Penaeus setiferus, ranging from mysis I through 9-days postlarva; for stages of P. aztecus ranging from protozoea II through 13-days postlarva; for 2-day and 4-day postlarvae of P. vannamei; and for 8-day postlarvae of P. californiensis. At salinity 32 o/oo and temperature 28 [degrees]C, the log per-animal respiration rates were found to be linearly related to log body weight, with positive slope of less than 1.0. The respiration rates were similar in P. aztecus, P. vannamei and P. californiensis, for animals of the same developmental stage, ranging from 1.40 [mu]l/hr/mg wet weight in protozoea II to 0.95 [mu]]l/hr/mg in 13-day postlarvae. Rates were slightly higher in P. setiferus than in the other species, varying from 1.57 [mu]]l/hr/mg in mysis I to 1.00 [mu]]l/hr/mg in 9-day postlarvae. Respiration rates were also determined for some stages of each species at other salinities (26, 20, 14 and 8 o/oo). There was apparent depression of respiration in the youngest animals (mysis I and 2-day postlarvae) at salinities of 8 and 14 o/oo. Respiration rates tended to be higher at 26 o/oo than at 20 or 32 o/oo, especially in the older postlarvae, indicating some use of metabolic energy in osmoregulation. [...]