Osmoregulation in the stenohaline freshwater catfish, Heteropneustes fossilis (Bloch) in deionized water

Parwez, Iqbal; Sherwani, Fauzia Anwar; Goswami, Shashi V.

doi:10.1007/bf00004342

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…These adjustments observed in fish exposed to deionized water presumably reflect the steepness of the ionic gradients and the increased energetic demand for active transepithelial NaCl absorption (Lee et al, 1996;Sakuragui et al, 2003Sakuragui et al, , 2007. Both prolactin and cortisol production are greatly stimulated in fish exposed to deionized water and the particular concentrations and ratio of these osmoregulatory hormones may provide a sensory clue for alteration of branchial epithelial ultrastructure and function in ion-poor environments (Parwez et al, 1994). The changes in fish osmoregulation that occur both at extremely low (deionized water) and strongly hyperhaline (>2× seawater) salinities suggest that unique mechanisms are involved in conferring tolerance to extreme salinities.…”

Section: −1mentioning

confidence: 99%

Physiological mechanisms used by fish to cope with salinity stress

Kültz

2015

Journal of Experimental Biology

326

161

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Salinity represents a critical environmental factor for all aquatic organisms, including fishes. Environments of stable salinity are inhabited by stenohaline fishes having narrow salinity tolerance ranges. Environments of variable salinity are inhabited by euryhaline fishes having wide salinity tolerance ranges. Euryhaline fishes harbor mechanisms that control dynamic changes in osmoregulatory strategy from active salt absorption to salt secretion and from water excretion to water retention. These mechanisms of dynamic control of osmoregulatory strategy include the ability to perceive changes in environmental salinity that perturb body water and salt homeostasis (osmosensing), signaling networks that encode information about the direction and magnitude of salinity change, and epithelial transport and permeability effectors. These mechanisms of euryhalinity likely arose by mosaic evolution involving ancestral and derived protein functions. Most proteins necessary for euryhalinity are also critical for other biological functions and are preserved even in stenohaline fish. Only a few proteins have evolved functions specific to euryhaline fish and they may vary in different fish taxa because of multiple independent phylogenetic origins of euryhalinity in fish. Moreover, proteins involved in combinatorial osmosensing are likely interchangeable. Most euryhaline fishes have an upper salinity tolerance limit of approximately 2× seawater (60 g kg −1). However, some species tolerate up to 130 g kg −1 salinity and they may be able to do so by switching their adaptive strategy when the salinity exceeds 60 g kg −1. The superior salinity stress tolerance of euryhaline fishes represents an evolutionary advantage favoring their expansion and adaptive radiation in a climate of rapidly changing and pulsatory fluctuating salinity. Because such a climate scenario has been predicted, it is intriguing to mechanistically understand euryhalinity and how this complex physiological phenotype evolves under high selection pressure.

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Section: −1mentioning

confidence: 99%

Physiological mechanisms used by fish to cope with salinity stress

Kültz

2015

Journal of Experimental Biology

326

161

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“…The changes seen (Figure 1) indicated that iono/osmoregulatory homeostasis of goldfish had been perturbed and that new steady‐state conditions were achieved. The results shown in Figure 1 are consistent with previous observations in goldfish (Chasiotis et al ., 2009) as well as other fish species ( e.g ., Kolosov & Kelly, 2016; Parwez et al ., 1994) acclimated to ion‐poor conditions. While changes in salt and water balance were observed in response to diminished water ion content, no significant effect of dietary ion concentration on serum osmolality and serum chloride concentration was observed when fish were held in FW.…”

Section: Discussionmentioning

confidence: 99%

“…Ghrelin in the brain stimulates the secretion of pituitary hormones, such as PRL and GH (Kaiya et al ., 2003a,b; Unniappan & Peter, 2004). PRL, known as a freshwater‐adapting hormone, plays an important role in the ability of fishes to acclimate to a hypoosmotic environment (Parwez et al ., 1994; Sakamoto & McCormick, 2006). PRL is believed to act on osmoregulatory organs to prevent ion loss and water uptake by changing the permeability of epithelia (Manzon, 2002).…”

Section: Discussionmentioning

confidence: 99%

Ion‐poor water and dietary salt deprivation upregulate the ghrelinergic system in the goldfish (Carassius auratus)

Lim

Lee

Blanco

et al. 2021

Journal of Fish Biology

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Because the ghrelinergic system in teleost fishes is broadly expressed in organs that regulate appetite as well as those that contribute to the regulation of salt and water balance, we hypothesized that manipulating salt and water balance in goldfish (Carassius auratus) would modulate the ghrelinergic system. Goldfish were acclimated to either freshwater (FW) or ion‐poor FW (IPW) and were fed either a control diet containing 1% NaCl or low‐salt diet containing 0.1% NaCl. Endpoints of salt and water balance, i.e., serum Na+ and Cl− levels, muscle moisture content and organ‐specific Na+‐K+‐ATPase (NKA) activity, were examined in conjunction with brain, gill and gut mRNA abundance of preproghrelin and its receptor, growth hormone secretagogue receptor (ghs‐r). Acclimation of fish to IPW reduced serum osmolality and Cl− levels and elevated kidney NKA activity, while FW fish fed a low NaCl diet exhibited a modest reduction in muscle moisture content but otherwise no apparent osmoregulatory disturbance. In contrast, a combined treatment of IPW acclimation and low dietary NaCl content reduced serum osmolality and Cl− levels, elevated muscle moisture content and increased gill, kidney and intestinal NKA activity. This intensified response to the combined effects of water and dietary ion deprivation is consistent with an increased effort to enhance ion acquisition. In association with these latter observations, a significant upregulation of preproghrelin mRNA expression in brain and gut was observed. A significant increase in ghs‐r mRNAs was also observed in the gill of goldfish acclimated to IPW alone but a reduction in dietary NaCl content did not impact the ghrelinergic system of goldfish in FW. The results support the hypothesis that the ghrelinergic system is modulated in response to manipulated salt and water balance. Whether the central and peripheral ghrelinergic system contributes to ionic homeostasis in goldfish currently remains unclear and warrants further research.

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“…Na /K -ATPase activity profiles of teleosts at branchial and renal levels and improve hypoion regulation after transfer to different salinities (Peter et al, 2011;Arjona et al, 2011;Deal and Volkoff, 2020). Extensive research work has been carried out on the osmoregulatory, energetic, and endocrine aspects of economically important freshwater catfish, H. fossilis (Parwez et al, 1979(Parwez et al, , 1984(Parwez et al, , 1994Goswami et al, 1983;Parwez and Goswami, 1985;Sherwani and Parwez, 2000, 2008. However, the role of T during 4 osmoionic regulation in this fish remains to be elucidated.…”

mentioning

confidence: 99%

Effect of thyroxine on Na+/K+-ATPase and SDH activities in gills and kidney during osmotic adjustments of Heteropneustes fossilis at higher salinity

Sherwani¹

2023

JEB

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Aim: The aim of the present study was to investigate the facilitatory role of thyroxine during adaptation process of catfish, Heteropneustes fossilis in higher salinity following its exogenous administration by monitoring changes in plasma osmolality, branchial and renal sodium-potassium dependent adenosine triphosphatase and succinic dehydrogenase enzyme activity profiles and study the effect of direct transfer of fish to higher salinities on plasma thyroxine levels. Methodology: Catfish were directly transferred from tap water to 30 and 35% sea water and plasma thyroxine profiles were analysed. Fish were injected with thyroxine at a dose of 2 and 5 µg g-1 b.wt. daily for five days and then transferred to tap water and 30% sea water. Fish were sampled after day 3 and day 6, post-transfer and plasma osmolality was measured, and the enzyme activities were determined in gills and kidney. Results: Higher levels of plasma thyroxine were observed after transfer of fish from tap water to higher salinities. Treatment of fish with thyroxine at higher dose (5 µg g-1 b.wt.) showed a significant increase in plasma osmolality in tap water (p<0.05) while the enzymes in gills were found to be significantly higher both in tap water (p<0.05; p<0.01for Na+/K+-ATPase and p<0.001 for SDH) and 30% sea water (p<0.001for Na+/K+-ATPase and p<0.01; p<0.001 for SDH). No significant changes were observed in any of the parameters analysed after exogenous administration of thyroxine at lower dose (2 µg g-1 b.wt.). Interpretation: Thyroxine affects the osmotic adjustment of fish following transfer to higher salinities and its exogenous administration at at a dose of 5 µg g-1 b.wt. may improve the hypoosmoregulatory ability. Key words: Hormonal control, Osmoregulation, Teleost, Thyroid hormones

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Osmoregulation in the stenohaline freshwater catfish, Heteropneustes fossilis (Bloch) in deionized water

Cited by 7 publications

References 32 publications

Physiological mechanisms used by fish to cope with salinity stress

Physiological mechanisms used by fish to cope with salinity stress

Ion‐poor water and dietary salt deprivation upregulate the ghrelinergic system in the goldfish (Carassius auratus)

Effect of thyroxine on Na+/K+-ATPase and SDH activities in gills and kidney during osmotic adjustments of Heteropneustes fossilis at higher salinity

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