Feeding has the largest effect on the ammonia excretion rate of the southern rock lobster,
Jasus edwardsii, and the western rock lobster, Panulirus cygnus
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Crear, BJ and Forteath, GNR, Feeding has the largest effect on the ammonia excretion rate of the southern rock lobster,
Jasus edwardsii, and the western rock lobster, Panulirus cygnus, Aquacultural Engineering, 26, (4) pp. 239-250. ISSN 0144-8609 (2002) [Refereed Article]
The total ammonia nitrogen (TAN) excretion of spiny lobsters Jasus edwardsii and Panulirus cygnus, was determined in relation to temperature, body weight, emersion, daily rhythm and feeding. Temperature and body weight had large influences on the rate of TAN excretion. Exponential relationships were found between temperature (T) and TAN excretion of both species. These were described by the following equations: J. edwardsii Log10 TAN = 0.041 T-3.57 (r2 = 0.979, F = 143.2, P = 0.001), P. cygnus Log10 TAN = 0.057T-3.90 (r2 = 0.987, F = 302.2, P < 0.001). TAN excretions of both species were positively correlated to body weight (W), and the relationships were described by the following equations: J. edwardsii Log10 TAN = 0.473 log10 W-1.704 (r2 = 0.42, F = 14.05, P = 0.001), P, cygnus Log10 TAN = 0.499 log10 W-1.346 (r2 = 0.69, F = 44.18, P < 0.001), TAN excretion increased significantly when lobsters were re-immersed after a 30 min period of emersion. However, it returned to pre-emersion levels by the second hour of re-immersion. Daily rhythm resulted in a significantly higher nocturnal TAN excretion rate for J. edwardsii; no daily rhythm was observed for P. cygnus, Feeding had the largest influence on TAN excretion, with maximum increases of 6.28 (J. edwardsii) and 5.60 (P. cygnus) times the pre-feeding level. TAN excretion rates remained significantly higher than the pre-feeding levels for an extended period (26 h, J. edwardsii; 30 h, P. cygnus). Implications for the use of purging tanks in lobster holding facilities and for the design of biofiltration systems are discussed. © 2002 Elsevier Science B.V. All rights reserved.
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