Characterization of the brain-pituitary axis in pejerrey Odontesthes bonariensis.

Address correspondence to: Gustavo M. Somoza. IIB-INTECH, Camino de Circunvalación Laguna, Km 6 (B7130IWA) Chascomús, ARGENTINA. E-mail: somoza@intech.gov.ar Received on April 10, 2005. Accepted on June 1, 2005. The pejerrey fish (Odontesthes bonariensis), a large atherinid native from the inland waters of Buenos Aires Province, is considered one of the most emblematic fresh water fish species of Argentina (López et al., 2001). Although it is an important commercial and game fish, its culture has not been well developed in Argentina. Besides, some reports have demonstrated the existence of problems in intensive pejerrey aquaculture: early sexual maturation, the presence of spawning asynchrony between females and low growth rates (Strüssmann, 1989; Strüssmann et al., 1993). During the last years the interest of the laboratory has been focussed on the study of the reproductive physiology and the mechanisms involved during sexual determination/differentiation in pejerrey, not only from a basic point of view but also keeping attention to the potential application of the knowledge on the development of pejerrey aquaculture. In this context, the goal of the present work was to summarize the findings on the characterization of the brain-pituitary-gonadal axis in Odontesthes bonariensis. Gonadotropin-releasing hormone

[1]  G. Somoza,et al.  Increase in milt production by hormonal treatment in the pejerrey fish Odontesthes bonariensis (Valenciennes 1835) , 2005 .

[2]  D. Uchida,et al.  Methods of sex control in fishes and an overview of novel hypotheses concerning the mechanisms of sex differentiation. , 2005 .

[3]  B. A. Adams,et al.  Cloning and Localization of Three Forms of Gonadotropin-Releasing Hormone, Including the Novel Whitefish Form, in a Salmonid, Coregonus clupeaformis1 , 2004, Biology of reproduction.

[4]  Kamran Shalchian-Tabrizi,et al.  The brain-pituitary-gonad axis in male teleosts, with special emphasis on flatfish (Pleuronectiformes). , 2004, Comparative biochemistry and physiology. Part A, Molecular & integrative physiology.

[5]  G. Somoza,et al.  Molecular cloning of cDNAs encoding FSH-β and LH-β subunits in the pejerrey fish, Odontesthes bonariensis , 2003, Fish Physiology and Biochemistry.

[6]  G. Somoza,et al.  Characterization of three GnRH cDNA sequences in the pejerrey fish Odontesthes bonariensis , 2003, Fish Physiology and Biochemistry.

[7]  P. Swanson,et al.  Biochemistry and physiology of fish gonadotropins , 2003, Fish Physiology and Biochemistry.

[8]  G. Somoza,et al.  Gonadotropin-Releasing Hormone (GnRH): From Fish to Mammalian Brains , 2002, Cellular and Molecular Neurobiology.

[9]  G. Somoza,et al.  Gonadotropin-releasing hormone (GnRH) neuronal systems in the pejerrey, Odontesthes bonariensis (Atheriniformes) , 2000, Fish Physiology and Biochemistry.

[10]  O. Kah,et al.  Evolutionary aspects of GnRHs, GnRH neuronal systems and GnRH receptors in teleost fish. , 2004, General and comparative endocrinology.

[11]  I. Parhar,et al.  Gonadotropin-releasing hormone neuronal development during the sensitive period of temperature sex determination in the pejerrey fish, Odontesthes bonariensis. , 2003, General and comparative endocrinology.

[12]  G. Somoza,et al.  Expression of Pejerrey Gonadotropin-Releasing Hormone in Three Orders of Fish1 , 2002, Biology of reproduction.

[13]  W. Fischer,et al.  Three Forms of Gonadotropin-Releasing Hormone, Including a Novel Form, in a Basal Salmonid, Coregonus clupeaformis1 , 2002, Biology of reproduction.

[14]  C. A. Strüssmann,et al.  Immunocytochemical identification of GtH1 and GtH2 cells during the temperature-sensitive period for sex determination in pejerrey, Odontesthes bonariensis. , 2001, General and comparative endocrinology.

[15]  O. Kah,et al.  Differential expression of three different prepro‐GnRH (gonadotrophin‐releasing hormone) messengers in the brain of the european sea bass (Dicentrarchus labrax) , 2001, The Journal of comparative neurology.

[16]  B. Quérat,et al.  Phylogenetic Analysis of the Vertebrate Glycoprotein Hormone Family Including New Sequences of Sturgeon (Acipenser baeri) β Subunits of the Two Gonadotropins and the Thyroid-Stimulating Hormone1 , 2000, Biology of reproduction.

[17]  R. Fernald,et al.  Gonadotropin-Releasing Hormone Genes: Phylogeny, Structure, and Functions , 1999, Frontiers in Neuroendocrinology.

[18]  G. Somoza,et al.  GnRH molecular variants in the brain and pituitary gland of pejerrey, Odontesthes bonariensis (Atheriniformes). Immunological and chromatographic evidence for the presence of a novel molecular variant. , 1997, Comparative biochemistry and physiology. Part C, Pharmacology, toxicology & endocrinology.

[19]  C. A. Strüssmann,et al.  Thermal thresholds and critical period of thermolabile sex determination in two atherinid fishes, Odontesthes bonariensis and Patagonina hatcheri , 1997 .

[20]  C. A. Strüssmann,et al.  Triploidy induction in an atherinid fish, the pejerrey (Odontesthes bonariensis). , 1993 .

[21]  C. Strussmann.  Basic studies on seed production of pejerrey Odontesthes bonariensis , 1990 .

[22]  P. Seeburg,et al.  The mammalian GnRH gene and its pivotal role in reproduction. , 1987, Recent progress in hormone research.

[23]  Jorge Calvo,et al.  Fenómenos reproductivos en el pejerrey (Basilichthys Bonariensis) : I. Escala y tabla de madurez , 1970 .