Larval development in the American lobster: changes in metabolic activity and the O:N ratio

Abstract

CAPUZZO, J . M., and B. A. LANCASTER. 1979. Larval development in the American lobster: changes in metabolic activity and the O:N ratio. Can. J. Zool. 57: 184.5-1848. The rates of oxygen consumption under conditions of feeding and starvation and the rates of ammonia excretion after feeding increased with each larval stage of the American lobster (Homrrrus rrmeric,trnus Milne Edwards) and decreased with the first postlarval stage. There was no significant difference in the 0 : N ratio of the first three larval stages (-26.5), but a significant reduction ( P i 0.01) was measured among stages IV and V. It appears that, whereas protein catabolism may be the principal source of energy. some of the energy yield during larval development is from lipid or carbohydrate catabolism; the use of the latter substrates is diminished in the last larval and first postlarval stages. CAPUZZO, J . M., et B. A . LANCASTER. 1979. Larval development in the American lobster: changes in metabolic activity and the O:N ratio. Can. J. Zool. 57: 1845-1848. Le taux de consommation d'oxygene chez des animaux nourris et des animaux prives de nourriture et le taux d'excretion d'ammoniaque apres alimentation augmentent h chaque changement de stade larvaire chez le homard (Homrrrus nmerictrnus Milne Edwards) et diminuent au premier stade post-larvaire. I1 n'y a pas de difference significative du rapport O:N chez les trois premiers stades larvaires (-26.5), mais il se produit une diminution appreciable (P < 0.01) de ce rapport entre les stades IV et V. I1 semble que, bien que le catabolisme des proteines soit la principale source d'energie. une partie de I'energie liberee durant le developpement vienne du catabolisme des lipides ou des hydrates de carbone; I'utilisation de ces substrats diminue durant le dernier stade larvaire et le premier stade post-larvaire.[Traduit par le journal]

Bioacumulation of trace elements in hepatic and renal tissues of the white mullet Mugil curema Valenciennes, 1836 (Actinopterygii, Mugilidae) in two coastal systems in southeastern Brazil

“…Therefore, our results indicated that 1.6 mg/L NO 2 -N produces physiological stress, which cause changes in excretion patterns. The same was shown for larvae of the shrimp, Palaemon serratus, subjected to stress of temperature and salinity (Yagi et al 1990), and larvae of the crab, Cancer irroratus, (Johns 1981) and lobster, Homarus americanus, larvae (Capuzzo and Lacaster 1979) exposed to unfavorable temperatures.…”

Effects of Ambient Nitrite on Amazon River Prawn, Macrobrachium amazonicum, larvae

“…Therefore, our results indicated that 1.6 mg/L NO 2 ‐N produces physiological stress, which cause changes in excretion patterns. The same was shown for larvae of the shrimp, Palaemon serratus , subjected to stress of temperature and salinity (Yagi et al ), and larvae of the crab, Cancer irroratus , (Johns ) and lobster, Homarus americanus , larvae (Capuzzo and Lacaster ) exposed to unfavorable temperatures.…”

Developmental changes in the structure and function of lobster hemocyanin

“…Their metabolic rates are significantly higher than those of later benthic stages (Capuzzo and Lancaster, 1979a), and their pelagic habitat requires much more active swimming. Table 2 shows the measured values for heart size and heart rate in the larval stages of Homarus.…”

“…At the fifth stage, lobsters are considered to be postlarval and adapt a benthic habitat (Capuzzo and Lancaster, 1979a). Herrick noted fewer changes occurring during molts to later stages.…”