Dietary uptake efficiency of 2,2ǐ,4,4ǐ,5,5ǐ-hexachlorobiphenyl in yellow perch and rainbow trout: Role of dietary and body lipids

1999 ◽  
Vol 18 (5) ◽  
pp. 938-945
Author(s):  
Henryka Dabrowska ◽  
Susan W. Fisher ◽  
Konrad Dabrowski ◽  
Alfred E. Staubus
Keyword(s):  
Rainbow Trout ◽  
Yellow Perch ◽  
Uptake Efficiency ◽  
Dietary Uptake

Agonistic Behavior in Several Species of Fish

1965 ◽  
Vol 16 (3) ◽  
pp. 845-850 ◽  
Author(s):  
Arthur L. McDonald ◽  
Norman W. Heimstra
Keyword(s):  
Rainbow Trout ◽  
Largemouth Bass ◽  
Agonistic Behavior ◽  
Yellow Perch ◽  
Observation Session ◽  
Interspecies Differences ◽  
Green Sunfish

Seven species of fish were studied in an attempt to determine interspecies differences in the amount and type of agonistic behavior shown. Fish in each species were paired and the frequency of attacks shown during a 5-min. observation session was recorded. An observation session was held for 16 pairs of fish of the same species on 5 consecutive days. It was found that bluegill showed the highest frequency of attacks, then green sunfish, largemouth bass, rainbow trout, black crappie, and yellow perch in that order. No attacks were recorded for walleyes during any of the observation sessions. Qualitative differences shown in agonistic behavior among the various species are also discussed.

Biological and Toxicologtcal Effects of Environmental Contaminants in Fish and Their Eggs

1983 ◽  
Vol 40 (3) ◽  
pp. 306-312 ◽  
Author(s):  
A. J. Niimi
Keyword(s):  
Rainbow Trout ◽  
Organic Contaminants ◽  
Yellow Perch ◽  
Survival Rates ◽  
Lake Ontario ◽  
Smallmouth Bass ◽  
Salmo Gairdneri ◽  
White Bass ◽  
Morone Chrysops ◽  
Contaminant Transfer

Rainbow trout (Salmo gairdneri), white sucker (Catostomus commersoni), white bass (Morone chrysops), smallmouth bass (Micropterus dolomieui), and yellow perch (Perca flavescens) were collected from Lakes Ontario and Erie to examine the relationship between contaminant levels in females and their eggs. Factors such as the percent lipid in the fish and percent of total lipid deposited in the eggs significantly influenced (P < 0.01) contaminant transfer. The percentages of the 9–11 organic contaminants transferred generally showed less variation within a species than the percentages for a substance transferred among the five species examined. This relationship was consistent even though there was over a 10-fold range in contaminant concentrations within a given species. Mercury did not demonstrate this response because the percentage in eggs was low for all species. The levels of PCB monitored in eggs of rainbow trout collected from Lake Ontario suggest that egg and fry survival rates could be affected based on the toxicological evidence from other studies. An examination of the possible effects of spawning on the kinetics of contaminants among these species suggests that relative body concentrations of organic contaminants may be decreased by 5% or be increased by 10%, and mercury levels may be increased by 6–22% following the deposition of eggs. The amount of change varies with species and is influenced by the percent egg weight of body weight, and the rate of contaminant transfer from females to eggs.Key words: toxicology, contaminants, reproduction, Lake Ontario, Lake Erie

scholarly journals Depletion of IgT+ B cells in rainbow trout points to an essential role of IgT in microbiome homeostasis and clearance of mucosal pathogens

2016 ◽  
Vol 53 ◽  
pp. 75
Author(s):  
Fumio Takizawa ◽  
Zhen Xu ◽  
David Parra ◽  
Daniela Gomez ◽  
Scott LaPatra ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
B Cells ◽  
Essential Role ◽  
Mucosal Pathogens

scholarly journals The role of nitrosative and oxidative stress in rainbow trout (Oncorhynchus mykiss) liver tissue applied mercury chloride (HgCl2)

2021 ◽  
Vol 38 (3) ◽  
pp. 269-273
Author(s):  
Mehmet Reşit Taysı ◽  
Muammer Kırıcı ◽  
Mahinur Kırıcı ◽  
Hasan Ulusal ◽  
Bünyamin Söğüt ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Liver Tissue ◽  
Stress Index ◽  
Mercury Chloride ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Total Antioxidant ◽  
Ld50 Value

The aim of this study was to determine oxidative stress caused by mercury chloride (HgCl2) in rainbow trout (Oncorhynchus mykiss) liver tissue. For this purpose, the LD50 value of HgCl2 on rainbow trout was determined as 551 μg/L. In the study, 40 fish in four groups were exposed to 25% and 50% (138 and 276 µg/L) of the two subletal doses of HgCl2 for 2 and 7 days, with 10 fish (n=10) in each group. To determine oxidative stress; peroxynitrite (ONOO−), total oxidant level (TOS), total antioxidant level (TAS), oxidative stress index (OSI) and malondialdehyde (MDA) were analyzed. In the study, it was observed that the differences between the groups in terms of ONOO−, TOS, TAS and OSI levels in the liver tissues was significant (P<0.05), however, this difference was not significant (P>0.05) in terms of MDA values. As a result, it can be concluded that HgCl2 increases ONOO−, TOS, TAS, OSI and MDA levels in liver tissue and even small doses of mercury are toxic to fish.

The Role of β-Adrenoreceptors in the Recovery from Exhaustive Exercise of Freshwater-Adapted Rainbow Trout

1989 ◽  
Vol 147 (1) ◽  
pp. 471-491 ◽  
Author(s):  
D. G. MCDONALD ◽  
Y. TANG ◽  
R. G. BOUTILIER
Keyword(s):  
Rainbow Trout ◽  
Exhaustive Exercise ◽  
Acid Base ◽  
Post Exercise ◽  
Nacl Concentration ◽  
Adrenergic Mechanism ◽  
Acid Base Status ◽  
Isoproterenol Infusion ◽  
Net Fluxes

Rainbow trout, fitted with arterial catheters, were exercised to exhaustion by manual chasing and then injected with either saline (controls), the β-agonist isoproterenol or the β-antagonist propranolol. Blood acid-base status, branchial unidirectional and net fluxes of Na+ and Cl−, and net fluxes of ammonia and acidic equivalents (JHnet) were monitored over the subsequent 4 h of recovery. These same parameters were also monitored in normoxic, resting fish following isoproterenol injection and in exercised fish following acute post-exercise elevation of external NaCl concentration. In addition to confirming an important role for β-adrenoreceptors in the regulation of branchial gas exchange and red cell oxygenation and acid-base status, we find a significant β-adrenergic involvement in the flux of lactic acid from muscle and in JHnet across the gills. Both isoproterenol infusion (into nonexercised fish) and exhaustive exercise were found to cause net acid excretion. The post-exercise JHnet was further augmented by elevating [NaCl] but was not affected, in this instance, either by β-stimulation or blockade, indicating that JHnet was not entirely regulated by a β-adrenergic mechanism. On the basis of a detailed analysis of unidirectional Na+ and Cl− fluxes, we conclude that the increase in JHnet following exercise arose mainly from increased Na+/H+(NH4+) exchange and that the upper limit on JHnet was set by the supply of external counterions and by the increase in branchial ionic permeability that invariably accompanies exhaustive exercise.

Regulation of glucose production in rainbow trout: role of epinephrine in vivo and in isolated hepatocytes

2000 ◽  
Vol 278 (4) ◽  
pp. R956-R963 ◽  
Author(s):  
Jean-Michel Weber ◽  
Deena S. Shanghavi
Keyword(s):  
Rainbow Trout ◽  
Hepatic Glucose Production ◽  
Glucose Production ◽  
Isolated Hepatocytes ◽  
Relative Increase ◽  
Dependent Manner ◽  
Rainbow Trout Oncorhynchus Mykiss

The rate of hepatic glucose production (Ra glucose) of rainbow trout ( Oncorhynchus mykiss) was measured in vivo by continuous infusion of [6-3H]glucose and in vitro on isolated hepatocytes to examine the role of epinephrine (Epi) in its regulation. By elevating Epi concentration and/or blocking β-adrenoreceptors with propranolol (Prop), our goals were to investigate the mechanism for Epi-induced hyperglycemia to determine the possible role played by basal Epi concentration in maintaining resting Ra glucose and to assess indirect effects of Epi in the intact animal. In vivo infusion of Epi caused hyperglycemia (3.75 ± 0.16 to 8.75 ± 0.54 mM) and a twofold increase in Ra glucose (6.57 ± 0.79 to 13.30 ± 1.78 μmol ⋅ kg− 1 ⋅ min− 1, n = 7), whereas Prop infusion decreased Ra from 7.65 ± 0.92 to 4.10 ± 0.56 μmol ⋅ kg− 1 ⋅ min− 1( n = 10). Isolated hepatocytes increased glucose production when treated with Epi, and this response was abolished in the presence of Prop. We conclude that Epi-induced trout hyperglycemia is entirely caused by an increase in Ra glucose, because the decrease in the rate of glucose disappearance normally seen in mammals does not occur in trout. Basal circulating levels of Epi are involved in maintaining resting Ra glucose. Epi stimulates in vitro glucose production in a dose-dependent manner, and its effects are mainly mediated by β-adrenoreceptors. Isolated trout hepatocytes produce glucose at one-half the basal rate measured in vivo, even when diet, temperature, and body size are standardized, and basal circulating Epi is responsible for part of this discrepancy. The relative increase in Ra glucose after Epi stimulation is similar in vivo and in vitro, suggesting that indirect in vivo effects of Epi, such as changes in hepatic blood flow or in other circulating hormones, do not play an important role in the regulation of glucose production in trout.

scholarly journals Role of prey subcellular distribution on the bioaccumulation of yttrium (Y) in the rainbow trout

2020 ◽  
Vol 258 ◽  
pp. 113804 ◽  
Author(s):  
Pierre-Yves Cardon ◽  
Olivier Roques ◽  
Antoine Caron ◽  
Maikel Rosabal ◽  
Claude Fortin ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Subcellular Distribution
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