Consulta: subjectFacets:"Molt stage"
Registros recuperados: 3
Data/hora: 01/06/2024 14:27:26

Physiological response of the blue shrimp Litopenaeus stylirostris to short-term confinement on a pond bottom
Provedor de dados: 5
Autores: Mugnier, Chantal; Lemonnier, Hugues; Legrand, Alexandre.
The blue shrimp Litopenaeus stylirostris was exposed to pond sediment for 48 h and its physiological response was studied in relation to molt stage. Shrimp were maintained in cages within a semi-intensive pond after 4 months of rearing. Hypoosmoregulatory capacity (hypo-OC), magnesium ions (Mg ions), glucose, total proteins and oxyhaemocyanin were assayed in haemolymph. An increase of 370% to 500% in Mg ions concentration and 200% to 266% in glucose concentration, and a decrease in hypo-OC in shrimp maintained close to the centre of the pond indicated a short-term stress response in all molt stages. Indicators of water and sediment pore water quality were within normal operating limits, however this area was characterized by high water content and...
Tipo: Text
Palavras-chave: Stress; Pond bottom; Penaeid shrimp; Molt stage; Haemolymph constituents; Litopenaeus stylirostris.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1675.pdf

Response of the blue shrimp Litopenaeus stylirostris to temperature decrease and hypoxia in relation to molt stage
Provedor de dados: 5
Autores: Mugnier, Chantal; Soyez, Claude.
The effect of different levels of dissolved oxygen (DO) and a decreased temperature combined with severe hypoxia were studied in the blue shrimp Litopenaeus stylirostris in relation to molt stage. In the first experiment, shrimps were submitted to DO concentrations of 5 to 1 mg l(-1). Osmoregulatory capacity (OC) was measured in shrimps at molt stage C after 6, 24, or 48 h of exposure. No mortality was recorded but a significant negative effect of DO concentration on hypo-OC was observed for DO concentrations below 3 mg l(-1). Osmoregulation improved after 48 h exposure, compared to 6 and 24 h exposure.   In a second experiment, temperature was decreased from 28 to 22 degreesC in 24 h, before a severe hypoxia of 0.5+/-0.1 mg O-2 l(-1) was applied....
Tipo: Text
Palavras-chave: Temperature; Stress; Penaeid shrimp; Osmoregulation; Molt stage; Litopenaeus stylirostris; Hypoxia.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-372.pdf

Combined effect of external ammonia and molt stage on the blue shrimp Litopenaeus stylirostris physiological response
Provedor de dados: 5
Autores: Mugnier, Chantal; Justou, Carole.
The effect of ambient ammonia and molt stage on the physiological response of the blue shrimp Litopenaeus stylirostris was studied. Shrimps were submitted to 54.6 mg l(-1) ammonia-N (1.76 mg l(-1) NH3-N) for 24 h. Only shrimps in stages C, D-0, D-1 and D-2 were used for the analysis. Haemolymph was assayed for osmoregulatory capacity (OC), magnesium ion (Mg ion), total proteins, oxyhaemocyanin, lactate and glucose. Molt stage had an effect on OC, Mg ion and total proteins in control shrimps, and on OC, Mg ion and lactate in treated animals. Ammonia treatment decreased OC and lactate, and increase Mg ion concentration in haemolymph, for all molt stages. It decreased significantly total proteins and oxyhaemocyanin for stages D-1 and D-2, and increased...
Tipo: Text
Palavras-chave: Stress; Peneid shrimp; Molt stage; Litopenaus stylirostris; Haemolymph constituents; Ammonia.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-371.pdf