Steroid Profiles in Cultured Female Jundiá, the Siluridae Rhamdia quelen (Quoy and Gaimard, Pisces Teleostei), during the First Reproductive Cycle

Barcellos, Leonardo José Gil; Wassermann, G. F.; Scott, Alexander P.; Woehl, Viviane Mara; Quevedo, Rosmari Mezzalira; Ittzés, István; Krieger, Marta Helena; Lulhier, Francisco

doi:10.1006/gcen.2001.7603

Cited by 72 publications

(51 citation statements)

References 21 publications

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“…This corroborates observations made for jundiá in both the natural environment (Cassini, 1998) and in confinement (Ghiraldelli et al, 2007). Several authors have reported the existence of mature jundiá catfish females during most of the year, identifying three maturation peaks associated with warmer seasons (Barcellos et al, 2001;Ghiraldelli et al, 2007;Reidel et al, 2010). In the present study, mature female catfishes on final maturation phase were recorded in three of the four stations monitored.…”

Section: Discussionsupporting

confidence: 57%

“…Jundiá reproductive strategy consists of early partial spawnings along a reproductive cycle that extends from October to March in the Southern region of Brazil. The increase in temperature it is suggested as the key factor in their gonadal maturation (Barcellos et al, 2001;Ghiraldelli et al, 2007;Reidel et al, 2010) and partial spawning is an adaptive strategy to fluctuations in food supply, resulting in species preservation in unfavorable abiotic conditions (Nakatani et al, 1997). Jundiá starts spawning early in life; gonad maturation occurs as early as seven months for males and twelve months for females (Ghiraldelli et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the ovary fatty acids composition of Rhamdia quelen (Quoy & Gaimard) (Teleostei: Siluriformes), throughout their reproductive cycle

et al. 2015

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Knowledge about gonad fatty acid composition is important for broodstock diet formulation. This study characterized ovary fatty acid composition of wild female jundiá catfish (Rhamdia quelen) in their different gonadal maturation stages. Female jundiá (n = 36, average weight= 383.8 + 208.8 g) were captured in the rio Uruguay, comprising all seasons. Ovaries were extracted and classified according to their gonadal maturation stage. Gonad-somatic ratio varied significantly among seasons, being higher in spring (3.7), followed by summer (2.2), winter (0.9) and autumn (0.6). Main fatty acids groups detected were: saturated (SFA= 35.5%), monounsaturated (MUFA= 28.1%) and polyunsaturated fatty acids (PUFA= 33.5%). Over the four seasons, palmitic acid was recorded in large quantities, followed by docosahexaenoic acid (DHA) and arachidonic acid (ARA). ARA was present in higher concentrations in immature or maturing ovaries, and its content decreased along the maturation process. Conversely, DHA and eicosapentaenoic acid (EPA) contents increased during maturation. Such variation resulted in an increase in EPA/ARA and DHA/ARA ratios in mature gonads, which can be important for successful breeding. Such findings suggest that jundiá broodstock diets should contain lipids that provide long chain polyunsaturated fatty acids from both the n-3 and n-6 series to ensure gonadal maturation completion.O conhecimento da composição de ácidos graxos da gônada, como dos fatores que a influenciam são importantes na formulação de dietas para reprodutores de qualquer espécie. O presente estudo caracteriza a composição de ácidos graxos da gônada de fêmeas de jundiá (Rhamdia quelen) selvagens em seus diferentes estágios de maturação gonadal. Fêmeas de jundiá (n = 36) com peso médio de 383,8 + 208,8 g foram capturadas no alto rio Uruguai, ao longo de um ano, abrangendo as quatro estações. As gônadas foram extraídas, classificadas e posteriormente sua composição de ácidos graxos foi determinada. A relação gônado-somática variou significativamente entre as estações, sendo maior na primavera (3,7), seguida de verão (2,2), inverno (0,9) e no outono (0,6). Os principais grupos de ácidos graxos detectados foram: saturados (35,5 + 3,5%), monoinsaturados (28,1 + 4,3%) e ácidos graxos poli-insaturados (33,5 + 3,0%), com aproximadamente 30% para cada grupo. Ao longo das quatro estações, o ácido palmítico foi registrado em grandes quantidades, seguido do ácido docosahexaenóico (DHA) e ácido araquidônico (ARA). O ácido araquidônico estava presente em concentrações mais elevadas nas gônadas imaturas que nas gônadas maturas, e seu conteúdo diminuído ao longo do processo de maturação. Inversamente, o conteúdo de DHA e ácido eicosapentaenoico (EPA) aumentaram durante o processo de maturação. Tal variação resultou num aumento das relações EPA/ARA e DHA/ARA nas gônadas maturas, fato que pode ser importante para o sucesso da reprodução no jundiá. Tais resultados sugerem que dietas para reprodutores da espécie devem conter fontes de lipídios que proporcionem ác...

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Section: Discussionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Characterization of the ovary fatty acids composition of Rhamdia quelen (Quoy & Gaimard) (Teleostei: Siluriformes), throughout their reproductive cycle

et al. 2015

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“…It is an important species for aquaculture in temperate and subtropical climates, raised as a source of dietary protein, but little is still known about its basic physiology. Some aspects of its metabolism (Barcellos et al 2001a; Barcellos et al 2003) and its reproductive endocrinology have been described in recent papers, where seasonal variations have been reported in females (Barcellos et al 2001b) as well as in males (Barcellos et al 2002). The aim of the present paper is to provide the fish producers with a reference value to control the health of their jundia´cultivated in ponds, measuring periodically some representative samples.…”

Section: Introductionmentioning

confidence: 96%

Hematologic and serum biochemical values for jundiá (Rhamdia quelen)

Borges

Scotti

Siqueira

et al. 2004

Fish Physiol Biochem

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The determination of hematologic parameters for jundia´Rhamdia quelen cultivated in ponds is an easy and useful tool for the control of their sanitary and nutritional conditions. In the present work hematologic indices (RBC, WBC, Ht, Hb, MCV, MCH, MCHC), electrolytes (Cl, Na, K, Ca, Mg, P), metabolic products (creatinine, urea, ammonia, glucose, total protein, triglycerides, cholesterol, bilirubin) and enzymes (alanine and aspartate aminotransferase, alkaline phosphatase, lactate dehydrogenase) were measured in a population of jundia´. The mean ± SEM and range were established.

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“…In South America there is interest in the aquaculture of fish species that can survive cold winters and then grow fast in the warm summer and Rhamdia quelen is one of the species with these characteristics (Barcellos et al 2001(Barcellos et al , 2002.…”

Section: Introductionmentioning

confidence: 99%

ATP, ADP and AMP dephosphorylation in membrane fractions of Rhamdia quelen exposed to different temperatures

Lermen

Vieira

Schetinger

et al. 2005

Fish Physiol Biochem

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The silver catfish Rhamdia quelen is a teleost species from South America that can resist cold winters and grow quickly in the summer, representing an important species for aquaculture in both temperate and subtropical climates. NTPDase and 5¢-nucleotidase are enzymes responsible for the sequence of ATP dephosphorylation to adenosine in a variety of organs. This enzymatic cascade permits the resultant adenosine to be taken up by the cells. In the present study, membrane fractions of brain, liver and kidney from fish Rhamdia quelen exposed to 15, 23 and 31°C for 21 days (chronic) or 12 h (acute) were incubated with ATP, ADP and AMP as substrates. In the 21 day experiment the results showed that ATP hydrolysis was enhanced by the increase in temperature in all tissues, except for 31°C in the brain. NTPDase hydrolysis using ADP as substrate showed a behavior similar to that observed for ATP hydrolysis, except for 31°C, when the behavior was similar to that observed at 15°C in the brain. 5¢-Nucleotidase activity using AMP as substrate raised with increasing temperature in the three tissues studied. In the 12 h experiment the results obtained for the three temperatures did not differ significantly from each other for any of the tissues. We conclude that after a period of 21 days temperature may affect the activity of NTPDase and 5¢-nucleotidase, important enzymes implicated in nucleotide degradation.

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Steroid Profiles in Cultured Female Jundiá, the Siluridae Rhamdia quelen (Quoy and Gaimard, Pisces Teleostei), during the First Reproductive Cycle

Cited by 72 publications

References 21 publications

Characterization of the ovary fatty acids composition of Rhamdia quelen (Quoy & Gaimard) (Teleostei: Siluriformes), throughout their reproductive cycle

Characterization of the ovary fatty acids composition of Rhamdia quelen (Quoy & Gaimard) (Teleostei: Siluriformes), throughout their reproductive cycle

Hematologic and serum biochemical values for jundiá (Rhamdia quelen)

ATP, ADP and AMP dephosphorylation in membrane fractions of Rhamdia quelen exposed to different temperatures

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