Field Measurements of Tolerance to Extreme Hypersalinity in the California Killifish, Fundulus parvipinnis

Feldmeth, C. Robert; Waggoner, John P.

doi:10.2307/1442940

Cited by 29 publications

(14 citation statements)

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“…Despite of the changes in hematocrit seen in the pufferfishes, their muscle cells apparently have a greater or faster capacity for tissue water regulation (as also in Prodocimo & Freire, 2006), as in both species no differences in muscle tissue water content were noted, compatible with a previous report on the red grouper Epinephelus akaara and the black sea bream Mylio macrocephalus also submitted to dilute seawater (Woo & Wu, 1982). The values of muscle water content (~ 80%) for both pufferfishes were similar to previous values reported for other euryhaline species (Feldmeth & Waggoner, 1972;Plaut, 1998;Claireaux & Audet, 2000;Brown et al, 2001;Martinez-Álvarez et al, 2002), as well as for the same species (Prodocimo & Freire, 2006). No mobilization of the metabolic substrates stored in the gills or kidney or in plasma glucose have been detected in S. testudineus and S. greeleyi upon this short-term exposure to salinity reduction.…”

Section: Discussionsupporting

confidence: 90%

Metabolic substrates are not mobilized from the osmoregulatory organs (gills and kidney) of the estuarine pufferfishes Sphoeroides greeleyi and S. testudineus upon short-term salinity reduction

et al. 2008

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Metabolic substrates are not mobilized from the osmoregulatory organs(gills and kidney) of the estuarine pufferfishes Sphoeroides greeleyi and S. testudineus upon short-term salinity reductionViviane Prodocimo, Carine F. Souza, Cristina Pessini, Luiz Claudio Fernandes and Carolina A. FreireThe marine-estuarine species of pufferfishes Sphoeroides testudineus and S. greeleyi are very efficient osmoregulators. However, they differ with respect to their tolerance of salinity reduction. During low tide S. testudineus remains in diluted estuarine waters, whereas S. greeleyi returns to seawater (SW). The hypothesis tested here was that the short-term mobilization of metabolic substrates stored in their main osmoregulatory organs would correlate with this differential tolerance. Fishes exposed to 5‰ (for 6 h) were compared to those kept in 35‰. Branchial and renal contents of triglycerides, protein and glycogen were evaluated, and total ATPase activity accounted for the tissues' metabolism. Plasma osmolality, chloride and glucose, hematocrit, and muscle water content were also measured. Total triacylglycerol content was higher in S. greeleyi than in S. testudineus in both salinities and in both organs. Kidney glycogen contents were higher in S. greeleyi than in S. testudineus in 5 and 35‰. Total ATPase activity was reduced in 5‰ when compared to 35‰ in the kidney of S. greeleyi, and was higher in the gills of S. greeleyi than in those of S. testudineus, in both salinities. Upon exposure to dilute SW, both species displayed a similar osmoregulatory pattern: plasma osmolality and chloride were reduced. Again in both species, stability in muscle water content indicated cellular water content control. Although the metabolic substrates stored in the osmoregulatory organs of both species were not mobilized during these short-term sea water dilution events, some differences could be revealed between the two species. S. greeleyi showed more metabolic reserves (essentially triacylglycerols) in these organs, and its gills showed higher total ATPase activity than those S. testudineus. Os baiacus marinhosSphoeroides testudineus e S. greeleyi são freqüentadores de estuários e eficientes osmorreguladores. No entanto, eles diferem quanto à sua capacidade de tolerar a redução de salinidade. Durante a descida de maré S. testudineus permanece no estuário com salinidade reduzida e S. greeleyi retorna para a água do mar. A hipótese testada neste estudo foi a de que a mobilização em curto prazo dos substatos metabólicos armazenados nos órgãos osmorregulatórios poderia explicar esta tolerância diferencial a redução de salinidade. Peixes expostos a 5‰ (por 6 h) foram comparados com os mantidos em 35‰ . O conteúdo branquial e renal de triacilglicerol, proteína e glicogênio foram avaliados, e a atividade ATPásica total foi quantificada para representar o metabolismo do tecido. Osmolalidade, cloreto e glicose plasmáticos, o hematócrito e o conteúdo de água no músculo também foram mensurados. O conteúdo total de triacilglicerol foi maior em S. gr...

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Section: Discussionsupporting

confidence: 90%

Metabolic substrates are not mobilized from the osmoregulatory organs (gills and kidney) of the estuarine pufferfishes Sphoeroides greeleyi and S. testudineus upon short-term salinity reduction

et al. 2008

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“…A. dispar showed a rise in plasma osmolality from FW to SW with the increase tapering off at salinities to 120 where the plasma osmolality is 681.5 ± 52.9 mOsm kg -1 , and 506 ± 72 mOsm kg -1 at a salinity of 127 . The plasma concentration of F. parvipinnis remains unchanged between FW and a salinity of 60, rises at 85 and then remains constant, 457.4 mOsm kg -1 , to a salinity of 120 (Feldmeth and Waggoner 1972). The latter two species are also estuarine/nearshore marine species.…”

Section: Afps In Other Tissuesmentioning

confidence: 94%

Environmental influences on regulation of blood plasma/serum components in teleost fishes: a review

Nordlie

2009

Rev Fish Biol Fisheries

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Concentrations of both inorganic and organic blood plasma/serum components of teleost fishes were reviewed in seven habitat/life-history categories. These were: freshwater; inland saline; estuarine and nearshore marine; pelagic and deepsea; diadromous; southern cold-water; and northern cold-water. Plasma/serum osmolalities were compared among groups acclimated to/living in fresh and in salt water. Contributions of inorganic ions and colligative and non-colligative organic molecules were evaluated including with respect to melting and freezing points, and ''antifreeze activity'' of plasma/serum in species from cold marine waters. Possible roles of TMAO in deep-water fishes were reviewed. Discussion also included influences of ambient salinity and temperature on concentrations of plasma/serum components. Seasonal cycles of blood plasma/serum components were discussed, along with antifreeze concentrations in other body fluids and tissues of cold-water fishes. Regulatory patterns of plasma/serum osmolalities were compared among the most euryhaline of teleosts evaluated here. Highest mean values of plasma/serum osmolalities in sea water were seen in southern cold-water and in pelagic and deep-sea fishes. The southern cold-water group also had the lowest plasma/serum freezing points among these groups. Comparisons of mean plasma/serum Na ? and Cl -concentrations among fishes from fresh waters did not differ significantly among groups, but species from cold marine waters showed higher levels than did other groups in marine waters. Plasma/serum osmotic, Na ? and Cl -concentrations of these seven groups of teleosts were compared with those of other fish-like vertebrate groups. Possible impacts of global warming on regulatory responses of plasma/serum components were discussed.

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“…Mummichog inhabits a wide range of salinities but prefers the most saline sites, usually above 25 [22,25,37]. They present a great euryhaline range, covering 0 to 128 [38]. Altogether, with their wide thermic acclimation range, this species is able to colonize new habitats with great success [25].…”

Section: Discussionmentioning

confidence: 99%

Preliminary Insight into Winter Native Fish Assemblages in Guadiana Estuary Salt Marshes Coping with Environmental Variability and Non-Indigenous Fish Introduction

Gonçalves

Teodósio

Cruz

et al. 2017

Fishes

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This work aims to undertake a preliminary characterization of winter fish assemblages in the salt marsh areas of Guadiana lower estuary (South-East Portugal) and discusses the potential risks of habitat dominance by a non-indigenous species (NIS). To this effect, six field campaigns were carried out in four sampling sites during winter season targeting the collection of fish species. A total of 48 samples were collected. Individuals from seven different taxa (marine and estuarine) were collected, although the assemblage was dominated by two estuarine species-the native Pomatoschistus sp. (goby) and the NIS Fundulus heteroclitus (mummichog). Goby was the most abundant taxa in the majority of salt marsh habitats, except for one specific, marsh pool, where extreme environmental conditions were registered, namely high temperature and salinity. Such conditions may have boosted the intrusion of mummichog in this area. This species is well adapted to a wide range of abiotic factors enabling them to colonize habitats where no predators inhabit. Impacts of mummichog introduction in the Guadiana salt marsh area are still unpredictable since this is the first time they have been recorded in such high density. Nevertheless, in scenarios of increased anthropogenic pressure and, consequently, habitat degradation, there is a potential risk of mummichog spreading to other habitats and therefore competing for space and food resources with native species.

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Field Measurements of Tolerance to Extreme Hypersalinity in the California Killifish, Fundulus parvipinnis

Cited by 29 publications

References 0 publications

Metabolic substrates are not mobilized from the osmoregulatory organs (gills and kidney) of the estuarine pufferfishes Sphoeroides greeleyi and S. testudineus upon short-term salinity reduction

Metabolic substrates are not mobilized from the osmoregulatory organs (gills and kidney) of the estuarine pufferfishes Sphoeroides greeleyi and S. testudineus upon short-term salinity reduction

Environmental influences on regulation of blood plasma/serum components in teleost fishes: a review

Preliminary Insight into Winter Native Fish Assemblages in Guadiana Estuary Salt Marshes Coping with Environmental Variability and Non-Indigenous Fish Introduction

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