Physiological responses to salinity increases in the freshwater silversides Odontesthes bonariensis and O. hatcheri (Pisces, Atherinidae)

Tsuzuki, Mônica Yumi; Aikawá, Hideki; Strüssmann, Carlos Augusto; Takashima, Fumio

doi:10.1590/s1413-77392000000100007

Cited by 11 publications

(13 citation statements)

References 14 publications

(12 reference statements)

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“…In contrast to the lack of an effect on osmolality and ions in this experiment, previous studies have shown a close association of glucose and cortisol levels in pejerrey (Tsuzuki et al, 2000b; in which endogenous cortisol was measured. Cortisol is assigned to have a stimulatory effect on liver gluconeogenesis, elevating blood sugar levels (Wedemeyer et al, 1990;Boon et al, 1991), possibly providing readily accessible energy for osmoregulation (Assem and Hanke, 1979a,b;Abo Hegab and Hanke, 1982;.…”

Section: Resultscontrasting

confidence: 99%

“…It was also shown that pejerrey held in 0ppt presents basal levels of cortisol several-fold higher than those of typical freshwater species such as carp or tilapia (Tsuzuki et al, 2000b;. Furthermore, pejerrey maintained in fresh water after stressful conditions such as transportation or handling had marked increases in blood cortisol, glucose and hematocrit values, and decreases in blood ions and osmolality, whereas fish transferred to higher salinity levels showed the opposite responses (Tsuzuki et al, 2001).…”

Section: Introductionmentioning

confidence: 98%

“…In studies with pejerrey, as previously cited (Tsuzuki et al, 2000b;, cortisol levels were possibly affected not only by the stress of husbandry procedures, but also by salinity, making it impossible to establish a causal relationship between the changes in cortisol with those observed in glucose, ions and osmolality. Artificial elevation of blood cortisol levels has been regarded as an effective tool to isolate the effect of stress and investigate the role of cortisol in metabolism and osmoregulation in fish (Assem and Hanke, 1981;Hwang and Wu, 1993;Specker et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

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The significance of cortisol on acclimation to salinity in pejerrey Odontesthes bonariensis

Tsuzuki

Ogawa

Strüssmann

et al. 2007

Arq. Bras. Med. Vet. Zootec.

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The role of cortisol on the osmoregulation of pejerrey Odontesthes bonariensis at different salinities was investigated in adult fish injected with 0.7mg hydrocortisone per 100g body weight of fish, and transferred to 0, 5 and 20ppt of NaCl. Blood cortisol was 566ng/ml at the beginning of the experiment (0h) but surged to 1250ng/ml within 3h in cortisol-injected fish. Cortisol levels were influenced not only by treatment but also by time, being higher at 3h compared to 24h. Salinity level, time of exposure and their interaction, but not cortisol treatment, significantly affected plasma osmolality and the concentration of ions Cl -and Na + . This study showed that exogenous cortisol does not seem to play a significant role on the regulation of plasma osmolality and concentration of individual ions in pejerrey.Keywords: pejerrey, Odontesthes bonariensis, cortisol, osmoregulation, salinity RESUMO Investigou-se a participação do cortisol na osmoregulação de peixe-rei

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Section: Resultscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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The significance of cortisol on acclimation to salinity in pejerrey Odontesthes bonariensis

Tsuzuki

Ogawa

Strüssmann

et al. 2007

Arq. Bras. Med. Vet. Zootec.

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“…Por outro lado, a dinâmica temporal entre a elevação da abundância de ovos e larvas de peixes, da clorofila a e do biovolume de zooplâncton observada no período que antecede o pico de temperatura, revelou antecipação das desovas para que a prole, ao eclodir, disponha de mais recursos alimentares. Exemplos em estuários da influência nos diferentes estágios da vida dos peixes das mesmas variáveis abióticas e bióticas analisadas neste estudo são encontrados em McLusky (1994), Jobling (1996), Lorenz (1999), Claireaux e Audet (2000) e Tsuzuki et al (2000).…”

Section: Discussionunclassified

Variação espaço-temporal do ictioplâncton em praias estuarinas da Baía da Babitonga, Santa Catarina, Brasil

Souza-Conceição¹,

Spach²,

Costa³

et al. 2013

Biotemas

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Submetido em 30/03/2012 Aceito para publicação em 22/01/2013 ResumoNo Brasil, as praias estuarinas são muito pouco estudadas em relação ao ictioplâncton. Nesse contexto, de agosto de 2005 a julho de 2006, foram realizadas coletas mensais, com uma rede de plâncton cônica, com 200mm de abertura de malha e 40cm de diâmetro da boca, em sete praias estuarinas no setor polihalino da baía da Babitonga, Santa Catarina. Em cada praia foram obtidos dados relativos a temperatura, salinidade, oxigênio dissolvido, pH, clorofila a, e biovolume zooplanctônico. No total foram coletados 54.384 ovos de peixes e 10.576 larvas de peixes, com abundância média geral de 3.114 ovos.100m-3 e 607 larvas.100m -3 . Maior abundância de ovos ocorreu de outubro a março e maior abundância de larvas ocorreu de outubro a dezembro e entre fevereiro e abril. Entre as praias, nas intermediárias foi registrada maior abundância de ovos e nas mais externas (mais próximas da barra) foi registrada maior abundância de larvas. Ocorreu o predomínio de larvas das famílias Haemulidae, Engraulidae, Gobiidae, Sciaenidae, Blenniidae, Carangidae e Sparidae, a maioria presentes no período mais quente do ano. A análise das variáveis da coluna d'água, clorofila a, biovolume zooplanctônico e ictioplâncton revelou baixas correlações nos hábitats rasos estudados. Palavras-chave: Abundância; Estuário; Larvas de peixes; Ovos de peixes; Sul do Brasil AbstractSpatio-temporal variation of ichthyoplankton in estuarine beaches at the Babitonga bay, Santa Catarina, Brazil. In Brazil, estuarine beaches are poorly studied with regard to ichthyoplankton. In this context, from August 2005 to July 2006, monthly collections were conducted, using conical plankton net with 200µm mesh size and 40cm mouth diameter, at seven estuarine beaches in the polyhaline sector of Babitonga bay, Santa Catarina, Brazil. At each beach, data regarding temperature, salinity, dissolved oxygen, pH, chlorophyll-a, and zooplankton volume were obtained. A total of 54,384 fish eggs and 10,576 fish larvae were collected, with a Biotemas, 26 (2): 129-141, junho de 2013

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“…1). A few cases in which salinity was changed over a brief interval (less than 24 h, e.g., Chervinski, 1977b;Tsuzuki et al, 2000) relative to the time course of response were categorized as direct, and studies that quantified the tolerance of individuals reared at different salinity levels from early life stages (e.g., Perschbacher et al, 1990;Bohlen, 1999) were categorized as gradual. When subjects were tested at multiple temperatures, we used results from temperatures that imposed the lowest level of mortality.…”

Section: Interspecific Variability In Halotolerancementioning

confidence: 99%

Euryhalinity in An Evolutionary Context

Schultz¹,

McCormick²

2012

Fish Physiology

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Physiological responses to salinity increases in the freshwater silversides Odontesthes bonariensis and O. hatcheri (Pisces, Atherinidae)

Cited by 11 publications

References 14 publications

The significance of cortisol on acclimation to salinity in pejerrey Odontesthes bonariensis

The significance of cortisol on acclimation to salinity in pejerrey Odontesthes bonariensis

Variação espaço-temporal do ictioplâncton em praias estuarinas da Baía da Babitonga, Santa Catarina, Brasil

Euryhalinity in An Evolutionary Context

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