Nitrogenous excretion in the Antarctic plunderfish

Boyce, S. J.

doi:10.1006/jfbi.1998.0845

Cited by 2 publications

(3 citation statements)

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“…It is suggested that the female silver catfish use more efficiently the available protein in the diet, once the amount of hepatic ammonia was significantly higher than the ones observed for the males. This is because the ammonia results from the digestion of proteins and catabolism of amino acids (Boyce, ) and its synthesis is energetically more efficient than other waste products (Jobling, ). This happens mainly in the liver, from where it will be carried through the blood system until the branchiae to be excreted in water.…”

Section: Discussionmentioning

confidence: 99%

Effect of sex and protein level on the intermediary metabolism, growth, deposition of nutrients and profile of volatile compounds of silver catfish (Rhamdia quelen)

et al. 2017

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This study aimed at evaluating the intermediary metabolism, growth, nutritional deposition and volatile compounds of fillet of female and male silver catfish created in cages having commercial diets at two levels of crude protein. A total of 1,200 silver catfish were randomly distributed in 12 cages with initial weight of 130.05 ± 0.14 g and visually sexed. Commercial diets with 280 g/kg and 320 g/kg of crude protein were offered twice a day in the amount of 30 g/kg their biomass/day, for 90 days. At the end of the experimental period, biometry was performed to collect data, blood and tissue for later determination of plasma metabolites, hepatic metabolites, digestive enzymes, volatile compounds, deposition of nutrients and calculation of growth variables. There were metabolic differences due to the sex of silver catfish, reflecting greater productive efficiency on the females. For the plasma metabolites, in male, there were higher values of triglycerides and free amino acids than in female. For hepatic glucose, males fed with diet containing 280 g/kg of crude protein showed higher values. For protein and free amino acids, the interaction between males that received 320 g/kg of crude protein was higher. In males, there were higher values of AST and hepatic glycogen than in females. In turn, hepatic ammonia was higher in females.There was greater activity of acid protease enzymes and trypsin in the silver catfish that received diets containing 320 g/kg of crude protein. Regardless of sex, in this cultivation phase, diets with 320 g/kg of crude protein provided better performance to silver catfish. The profile of volatile compounds suggests mild odour for the fillet of silver catfish, which can be a competitive advantage of the species. K E Y W O R D Smetabolites, protein, Rhamdia quelen, sexing, volatile profile

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Section: Discussionmentioning

confidence: 99%

Effect of sex and protein level on the intermediary metabolism, growth, deposition of nutrients and profile of volatile compounds of silver catfish (Rhamdia quelen)

et al. 2017

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“…The mean R AM values of the populations in salt waters could be commensurate with a decrease in metabolic rates (Boyce and Clark, 1997; Boyce, 1999) due to increases in the water salinity (Swanson, 1998). In Cyprinodontids, the effect of salinity on metabolic rates has been shown in several studies (Nordlie et al., 1991; Jordan et al., 1993; Plaut, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…To investigate inter‐population variations in relative size indices (ratio‐related techniques) such as R AMs in the present work, the use of ancova before residual analysis (regression‐related techniques) provided a valid method for this purpose (Sutton et al., 2000) because they allowed the adjustment of the size variation in individuals from different populations. In fact, adjustment of size variation in the data by residual values compared analysis has also been used in studies of ecophysiologic traits (including nitrogenous excretion) where they provided valid results (Clarke et al., 1994; Boyce, 1999).…”

Section: Discussionmentioning

confidence: 99%

Field studies of ammonia excretion in Aphanius iberus (Pisces; Cyprinodontidae): body size and habitat effects

et al. 2007

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The effects of body size and habitat variability on ammonia excretion rates (R AMs ) of Aphanius iberus were analyzed in situ for the first time. At hourly intervals during a 5-h field experiment, ammonia excretion was measured in 75 mature specimens from three sampling sites (small creek, marine saltmine, and salt-marsh) established in a gradient of water salinity (0-5; 35-40; 65-70&). Our results showed a specific size dependence pattern of R AMs in the reproduction period, which might reflect an effect of the reproductive effort. In addition, the results point to a significant decrease in mean R AM values of each population from freshwater aquatic systems (3.81 ± 0.58 lmol g )1 h )1 in fish of 2.8 ± 0.3 mm total length, TL) to salt aquatic systems with significantly higher alkalinity (2.52 ± 0.35 lmol g )1 h )1 in fish of 3.1 ± 0.5 mm TL in marine salt-mine; 1.98 ± 0.55 lmol g )1 h )1 in fish of 3.1 ± 0.4 mm TL in salt-marsh). Due to the size-dependent pattern, R AM in different habitats cannot be compared directly; ANCOVA ANCOVA, followed by residual compared analysis (regression-related techniques), is seen as a valid method for this purpose. This work presents the first field data on ammonia excretion in the Aphanius genus and the flexible physiologic response characteristic of Cyprinodontids has been demonstrated.

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Nitrogenous excretion in the Antarctic plunderfish

Cited by 2 publications

References 0 publications

Effect of sex and protein level on the intermediary metabolism, growth, deposition of nutrients and profile of volatile compounds of silver catfish (Rhamdia quelen)

Effect of sex and protein level on the intermediary metabolism, growth, deposition of nutrients and profile of volatile compounds of silver catfish (Rhamdia quelen)

Field studies of ammonia excretion in Aphanius iberus (Pisces; Cyprinodontidae): body size and habitat effects

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