Neuroendocrine control of hydromineral regulation in the American lobster Homarus americanus H. Milne-Edwards 1837 (Crustacea, Decapoda). 1. Juveniles.
Juvenile lobsters survive well in salinities above 10.2% (300 mOsm/kg), and their osmotic and ionic (Cl-, Na+, Ca2+) regulation in dilute sea water is slightly hyperosmotic, similar to that of adults. Approximately a month after eyestalk ablation, osmotic and ionic (Cl-, Na+) regulation becomes isosmotic, water content increases, and survival rate in dilute sea water declines, but these changes can be partially reversed by implantation of eyestalk neuroendocrine tissue. Regulation of Ca2+, in contrast, is only slightly affected by eyestalk ablation. These results indicate that osmotic regulation and regulation of hemolymph Na+ and Cl- concentrations are at least partly controlled by eyestalk neuroendocrine factors in this species.
D000818:Animals; D001834:Body Water / Q000032:analysis; D004573:Electrolytes / Q000378:metabolism; D005260:Female; D006458:Hemolymph / Q000502:physiology; D006728:Hormones / Q000502:physiology; D008297:Male; D008121:Nephropidae / Q000502:physiology*; D009424:Nervous System Physiological Phenomena; D009799:Ocular Physiological Phenomena; D009994:Osmolar Concentration; D013045:Species Specificity; D014882:Water-Electrolyte Balance
D004573:Electrolytes; D006728:Hormones