scholarly journals Metabolism of the mussel Mytilus galloprovincialis from two origins in the Ría de Arousa (north-west Spain)

2000 ◽  
Vol 80 (5) ◽  
pp. 865-872 ◽  
Author(s):  
Jose M.F. Babarro ◽  
María José Fernández-Reiriz ◽  
Uxío Labarta
Keyword(s):  
Oxygen Consumption ◽  
Rocky Shore ◽  
Mytilus Galloprovincialis ◽  
Excretion Rate ◽  
Ammonia Excretion ◽  
Dry Weight ◽  
North West ◽  
Cultivation Period ◽  
Seed Origin ◽  
Ammonia Excretion Rate

Mussel seed Mytilus galloprovincialis (Bivalvia: Mytilidae) from two origins (rocky shore and collector ropes) was cultivated on a raft in the Ría de Arousa (north-west Spain), from seeding to thinning out, for 226 d (November 1995–July 1996) and two aspects of metabolism, oxygen consumption rate (VO2) and ammonia excretion rate (VNH4-N) were studied in situ.The model derived from multiple analysis of oxygen consumption accounted for 91.9% of the variance, based on dry weight of the mussels and the environmental factors quality of food (organic content) and mainly chlorophyll-a. Seed origin also showed significant influence. The seasonal pattern of the oxygen consumption can be attributed mainly to the variation of chlorophyll-a, which showed a higher range of values in the spring months.Origin of seed did not show a homogeneous effect on oxygen consumption throughout the cultivation period. Collector rope mussels showed higher oxygen consumption values at the beginning of the cultivation period and after the first 15 d, but the rocky shore mussels showed a higher oxygen consumption between days 22 and 110. Energy-conserving patterns and lower condition index at the onset of the experiment for rocky shore mussels could explain these initial differences.Multiple analysis on the variation of ammonia excretion rate provided a model that accounted for 72.6% of the variance based on dry weight of mussels, seed origin and the environmental parameters chlorophyll-a and total particulate matter. The rocky shore mussels showed a significantly higher excretion values for most of the cultivation period, although there was no constant tendency throughout. High excretion values were recorded between January and March, whilst for the rest of the cultivation period values were low.The O:N index was higher in collector rope mussels for most of the cultivation period, which may suggest a more favourable energy metabolism and/or a more appropriate nutritional state for these specimens.

Effects of water temperature and salinity on oxygen consumption rate and ammonia excretion rate of Saccostrea cucullata

2017 ◽  
Vol 37 (2) ◽  
Author(s):  
焦海峰 JIAO Haifeng ◽  
郑丹 ZHENG Dan ◽  
严巧娜 YAN Qiaona ◽  
尤仲杰 YOU Zhongjie ◽  
严小军 YAN Xiaojun
Keyword(s):  
Oxygen Consumption ◽  
Water Temperature ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Excretion Rate ◽  
Ammonia Excretion ◽  
Saccostrea Cucullata ◽  
Ammonia Excretion Rate

Some biochemical and physiological aspects of growth and gametogenesis inCrassostrea gigasandOstrea edulisgrown at sustained elevated temperatures

1979 ◽  
Vol 59 (1) ◽  
pp. 95-110 ◽  
Author(s):  
Roger Mann
Keyword(s):  
Crassostrea Gigas ◽  
Elevated Temperatures ◽  
Excretion Rate ◽  
Ammonia Excretion ◽  
Live Weight ◽  
Gonadal Development ◽  
Ostrea Edulis ◽  
Shell Weight ◽  
Histological Assessment ◽  
Ammonia Excretion Rate

Crassostrea gigas (Thunberg) andOstrea edulis L.were grown at sustained temperatures of 12°, 15°, 18° and 21°C for a period of 19 weeks. Regular assays of weight specific ammonia excretion rate were made, following which animals were sacrificed for estimation of dry meat weight, dry shell weight, biochemical composition (percentage carbon, nitrogen, carbohydrate, ash) and gonadal development (histological assessment). Crassostrea gigas grew from an intial live weight of 5·2 g to values of 23·5, 28·2, 34·6 and 38·7 g at 120, 150, 180 and 21 °C respectively.

scholarly journals Metabolic acidosis in toluene sniffing

CJEM ◽  
2013 ◽  
Vol 15 (04) ◽  
pp. 249-252 ◽  
Author(s):  
Jon Tuchscherer ◽  
Habib Rehman
Keyword(s):  
Metabolic Acidosis ◽  
Renal Tubular Acidosis ◽  
Excretion Rate ◽  
Ammonia Excretion ◽  
Distal Renal Tubular Acidosis ◽  
Anion Gap ◽  
Renal Tubular ◽  
Conjugate Bases ◽  
Osmolal Gap ◽  
Ammonia Excretion Rate

ABSTRACT Toluene sniffing, frequently described under the generic category of “glue sniffing,” is a potential cause of normal anion gap metabolic acidosis due to distal renal tubular acidosis. Urine anion gap is used to diagnose metabolic acidosis of a normal anion gap variety; however, pitfalls exist when using urine anion gap in the setting of toluene sniffing. We present the case of a young woman who had a normal anion gap metabolic acidosis due to toluene sniffing and an unexpectedly low urine anion gap. In such a scenario, the urine anion gap will underestimate the rate of ammonia excretion when the conjugate bases of acids other than HCl are excreted in large quantities. Estimation of the urine osmolal gap will provide a more accurate ammonia excretion rate in these circumstances. The challenges in interpretation of the urine anion gap and ammonia excretion in the setting of distal renal tubular acidosis due to toluene toxicity are discussed.

Production, respiration and ammonia excretion of two polychaete species in a north Norfolk saltmarsh

1999 ◽  
Vol 79 (6) ◽  
pp. 1029-1037 ◽  
Author(s):  
Mathilde Nithart ◽  
Elisabeth Alliot ◽  
Chantal Salen-Picard
Keyword(s):  
Oxygen Consumption ◽  
Secondary Production ◽  
Ammonia Excretion ◽  
Sampling Period ◽  
Dry Weight ◽  
Carbon Loss ◽  
Polychaete Species ◽  
Nereis Diversicolor ◽  
Nitrogen Budgets ◽  
Carbon And Nitrogen

The secondary production of Nereis diversicolor and Scoloplos armiger (Annelida, Polychaeta) was studied at Stiffkey saltmarshes (north Norfolk coast). Production estimation on the basis of monthly sampling (August 1992–July 1993) gives 17.91 g C m−2 y−1 for N. diversicolor, 3.37 g C m−2 y−1 for S. armiger. Oxygen consumption of individuals was studied using a respirometer at four temperatures (5, 10, 15 and 20°C). At 15 °C, the relationships between O2 consumption (mg h−1) and body dry weight (mg) is Y=0.003X0.695 for S. armiger and Y=0.003X0.498 for N. diversicolor. Ammonia excretion of S. armiger tends to increase with decreasing temperature whereas it increases from 5 to 15 °C for N. diversicolor. Carbon loss through respiration for the sampling period is estimated at 32 g C m−2 y−1 for S. armiger, and 31.7 g C m−2 y−1 for N. diversicolor. About 20% of the potential supply of phytobenthic carbon in the marsh would be converted by the populations of both species. Estimations of carbon and nitrogen budgets of S. armiger are discussed.

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