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Ammonia and inorganic phosphorus excretion by the planktonic chaetognath, Sagitta hispida Conant






J Cons Cons Perma Int Explor Mer 29(2): 123-129

Ammonia and inorganic phosphorus excretion by the planktonic chaetognath, Sagitta hispida Conant

Ammonia-nitrogen and phosphate-phosphorus excretion was studied in the chaetognath, Sagitta hispida Conant. Rates of excretion were determined by the difference in ammonia and phosphate levels in sea water in which the animals were maintained for a 24-hour period and duplicate sea water samples with no animals. The average daily rate of ammonia-N excretion by S. hispida was 0.91 ug A/mg dry weight. Phosphate-P excretion averaged 0.077 ug A/mg dry weight/day. The ratio of ammonia-N phosphate-P excretion was 11.3:1. Total Kjeldahl-nitrogen level of S. hispida was found to be 6.23 ug A N/mg dry weight. Thus, the average excretion of ammonia-N over a 24-hour period was approximately 14.5% of the total Kjeldahl-nitrogen content.

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Accession: 029992752

DOI: 10.1093/icesjms/29.2.123



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