Ambient Temperature Regulates Drinking and Arterial Pressure in Eels

Takei, Yoshiyuki; Tsukada, Takehiro

doi:10.2108/zsj.18.963

Cited by 12 publications

(10 citation statements)

References 24 publications

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“…Subsequently, 50·l of ANP containing 100·pmol·kg -1 ·eel·mass was injected in the same fashion. This dose is sufficient for the antidipsogenic action of ANP (Takei and Tsukada, 2001). The saline and ANP injections were separated by an interval of at least 45·min.…”

Section: Heat-coagulative Lesioningmentioning

confidence: 93%

Area postrema, a brain circumventricular organ, is the site of antidipsogenic action of circulating atrial natriuretic peptide in eels

Tsukada

Nobata

Hyodo

et al. 2007

Journal of Experimental Biology

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SUMMARY Accumulating evidence indicates that circulating atrial natriuretic peptide(ANP) potently reduces excess drinking to ameliorate hypernatremia in seawater(SW) eels. However, the cerebral mechanism underlying the antidipsogenic effect is largely unknown. To localize the ANP target site in the brain, we examined the distribution of ANP receptors (NPR-A) in eel brain immunohistochemically using an antiserum specific for eel NPR-A. The immunoreactive NPR-A was localized in the capillaries of various brain regions. In addition, immunoreactive neurons were observed mostly in the medulla oblongata, including the reticular formation, glossopharyngeal-vagal motor complex, commissural nucleus of Cajal, and area postrema (AP). Trypan Blue, which binds serum albumin and does not cross the blood–brain barrier, was injected peripherally and stained the neurons in the AP but not other NPR-A immunopositive neurons. These histological data indicate that circulating ANP acts on the AP, which was further confirmed by physiological experiments. To this end, the AP in SW eels was topically destroyed by electric cauterization or were by chemical lesion of its neurons by kainic acid, and ANP (100 pmol kg–1) was then injected into the circulation. Both heat-coagulative and chemical lesions to the AP greatly reduced an antidipsogenic effect of ANP, but the ANP effect was retained in sham-operated eels and in those with lesions outside the AP. These results strongly suggest that the AP, a circumventricular organ without a blood–brain barrier, serves as a functional window of access for the circulating ANP to inhibit drinking in eels.

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Section: Heat-coagulative Lesioningmentioning

confidence: 93%

Area postrema, a brain circumventricular organ, is the site of antidipsogenic action of circulating atrial natriuretic peptide in eels

Tsukada

Nobata

Hyodo

et al. 2007

Journal of Experimental Biology

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“…Temperature could theoretically influence blood volume by several different mechanisms. For example, acute elevation of water temperature increases drinking rate in some fish (9,51), and similar to the situation during exercise, the functional gill surface area probably increases with temperature to optimize oxygen uptake (49,54). These mechanisms could, at least transiently, lead to intravascular fluid uptake in freshwater fish.…”

Section: Blood Volume and Hematocrit Responsesmentioning

confidence: 98%

“…Two groups of fish, cannulated in the dorsal aorta as described above, were used in these experiments. Fish in one of the groups were also splenectomized, as previous studies have demonstrated that 51 Cr-labeled RBC are sequestered by the spleen, which may lead to an overestimation of the total blood volume (16). The spleen was removed by making an incision in the ventral midline starting rostral to the pelvic fins and running 3 cm rostrally.…”

Section: Blood Volume Determinationmentioning

confidence: 99%

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Venous hemodynamic responses to acute temperature increase in the rainbow trout (Oncorhynchus mykiss)

Sandblom¹,

Axelsson²

2007

American Journal of Physiology-Regulatory, Integrative and Comp

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Many ectotherms regularly experience considerable short-term variations in environmental temperature, which affects their body temperature. Here we investigate the cardiovascular responses to a stepwise acute temperature increase from 10 to 13 and 16 degrees C in rainbow trout (Oncorhynchus mykiss). Cardiac output increased by 20 and 31% at 13 and 16 degrees C, respectively. This increase was entirely mediated by an increased heart rate (fH), whereas stroke volume (SV) decreased significantly by 20% at 16 degrees C. The mean circulatory filling pressure (MCFP), a measure of venous capacitance, increased with temperature. Central venous pressure (Pven) did not change, whereas the pressure gradient for venous return (MCFP-Pven) was significantly increased at both 13 and 16 degrees C. Blood volume, as measured by the dilution of 51Cr-labeled red blood cells, was temperature insensitive in both intact and splenectomized trout. This study demonstrates that venous capacitance in trout decreases, but cardiac filling pressure as estimated by Pven does not change when cardiac output increases during an acute temperature increase. SV was compromised as fH increased with temperature. The decreased capacitance likely serves to prevent passive pooling of blood in the venous periphery and to maintain cardiac filling pressure and a favorable pressure gradient for venous return.

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“…A model that links the rate of carbonate production to fish body size and temperature was used to estimate rates of carbonate production. This is based on the observation that rates of drinking by fish are directly proportional to metabolic rate, and that drinking rates determine rates of carbonate production (Takei & Tsukada 2001;Wilson et al 2002;Taylor & Grosell 2006). Given this indirect link between carbonate production and metabolic rate, changes in relative rates of carbonate production with temperature can be approximated with the Arrhenius relationship.…”

Section: A R B O N a T E P R O D U C T I O Nmentioning

confidence: 99%

Fishing impacts on the marine inorganic carbon cycle

Wilson

2009

Journal of Applied Ecology

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Summary1. Teleost fish excrete precipitated carbonate and make significant contributions to the marine inorganic carbon cycle at regional and global scales. As total carbonate production is linked to fish size and abundance, fishing is predicted to affect carbonate production by modifying fish abundance and size-structure. 2. We draw on concepts from physiology, metabolic ecology, life history theory, population dynamics and community ecology to develop, validate and apply analytical tools to assess fishing impacts on carbonate production. Outputs suggest that population and community carbonate production fall rapidly at lower rates of fishing than those used as management targets for sustainable yield. 3. Theoretical predictions are corroborated by estimated trends in carbonate production by a herring population and a coral reef fish community subject to fishing. Our analytical results build on widely applicable relationships between life history parameters and metabolic rates, and can be generalized to most fished ecosystems. 4. Synthesis and applications. If the maintenance of chemical processes as well as biological process were adopted as a management objective for fisheries then the methods we have developed can be applied to assess the effects of fishing on carbonate production and to advise on acceptable rates of fishing. Maintenance of this ecosystem service would require lower rates of fishing mortality than those recommended to achieve sustainable yield.

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Ambient Temperature Regulates Drinking and Arterial Pressure in Eels

Cited by 12 publications

References 24 publications

Area postrema, a brain circumventricular organ, is the site of antidipsogenic action of circulating atrial natriuretic peptide in eels

Area postrema, a brain circumventricular organ, is the site of antidipsogenic action of circulating atrial natriuretic peptide in eels

Venous hemodynamic responses to acute temperature increase in the rainbow trout (Oncorhynchus mykiss)

Fishing impacts on the marine inorganic carbon cycle

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