Results 21 to 30 of about 559 (168)

Occurrence and control of Chilodonella spp. in pejerrey Odontesthes bonariensis [PDF]

Arquivo Brasileiro de Medicina Veterinária e Zootecnia, 2011
O presente trabalho teve por objetivo relatar a ocorrência e controle de infecção parasitária por Chilodonella spp. em alevinos de peixe-rei (O. bonariensis). A Chilodonella spp. é um ciliado que parasita tegumento e brânquias de peixes, podendo ocasionar grande mortalidade.
Fernandes, J. Morato, Portelinha, M.K., Rocha, C.B., Pouey, J.L.O.F., Piedras, S.R.N.   +4 more
openaire   +4 more sources

Primary Structure of a Novel Gonadotropin-Releasing Hormone in the Brain of a Teleost, Pejerrey* [PDF]

Endocrinology, 2001
The neuropeptide GnRH is the major regulator of reproduction in vertebrates acting as a first signal from the hypothalamus to pituitary gonadotropes. Three GnRH molecular variants were detected in the brain of a fish, pejerrey (Odontesthes bonariensis), using chromatographic and immunological methods.
A D, Montaner, M K, Park, W H, Fischer, A G, Craig, J P, Chang, G M, Somoza, J E, Rivier, N M, Sherwood   +7 more
openaire   +2 more sources

Biological traits and growth patterns of pejerreyOdontesthes argentinensis

Journal of Fish Biology, 2012
This study assesses for the first time the relationship between annual cycles of different biological indices with growth patterns of a marine pejerreyOdontesthes argentinensispopulation near its southern‐distribution boundary in North Patagonia. The reproductive period is between September and November evidenced by an increase in the gonado‐somatic ...
Llompart, Facundo Manuel, Colautti, Dario César, Maiztegui, Tomás, Cruz Jiménez, Adriana Milena, Baigún, Claudio Rafael M.   +4 more
openaire   +3 more sources

Main diseases of pejerrey (Odontesthes bonariensis) in central Argentina [PDF]

Pesquisa Veterinária Brasileira, 2006
Argentina's central region includes an important area covered by shallow pampean lakes and dams. In these environments, fishing of pejerrey Odontesthes bonariensis Valenciennes, 1835 (Pisces, Atherinopsidae), the most important fresh-water fish of the country, is a relevant social activity and also a considerable economic resource.
Mancini, M., Rodriguez, C., Prosperi, C., Salinas, V., Bucco, C.   +4 more
openaire   +3 more sources

Basic studies on the culture of pejerrey. II. Effects of temperature upon survival and histological changes of starved pejerrey Odontesthes bonariensis larvae.

NIPPON SUISAN GAKKAISHI, 1989
Preliminary results on the effects of incubation and rearing temperatures on histological and morphometrical features and on starvation induced mortality of first feeding pejerrey larvae are presented. Newly hatched larvae at 17.5°C were nearly 8% larger than those at 21.5°C, had significantly larger lower jaw lengths and mouth gapes but smaller yolk ...
Strüssmann, Carlos Augusto, Takashima, Fumio   +1 more
openaire   +2 more sources

New approaches for growth improvement in pejerrey Odontesthes bonariensis (Valenciennes, 1835) culture (Atherinomorpha: Atherinopsidae)

Neotropical Ichthyology
The pejerrey is the most important recreational species in shallow temperate lakes and reservoirs of Argentina and the attempts to develop its culture have started a century ago.
Patricio J. Solimano, Javier R. Garcia de Souza, Tomás Maiztegui, Claudio R. M. Baigún, Darío C. Colautti   +4 more
doaj   +1 more source

Criação de juvenis de peixe-rei (Odontesthes argentinensis) em diferentes taxas de arraçoamento Rearing of pejerrey (Odontesthes argentinensis) juveniles at different feeding rates

Ciência Rural, 2006
Este estudo teve como objetivos avaliar os efeitos de diferentes taxas de arraçoamento sobre a sobrevivência e o crescimento de juvenis do peixe-rei (Odontesthes argentinensis).
Marcelo Borges Tesser, Luís André Sampaio   +1 more
doaj   +1 more source

The effect of rearing temperature in larval development of pejerrey, Odontesthes bonariensis: morphological indicators of development

Neotropical Ichthyology
It is well known that in pejerrey water temperature not only affects growth rates but also directs the sexual differentiation process. This fact rise the question of how different the development of pejerrey larvae of the same age is when reared at ...
Tomás Chalde, Daniel A. Fernández, Víctor E. Cussac, Gustavo M. Somoza   +3 more
doaj   +1 more source

Expression of pejerrey gonadotropin-releasing hormone in three orders of fish. [PDF]

Biology of reproduction, 2003
Molecular variants of GnRH were characterized by reverse-phase, high-performance liquid chromatography from brain extracts of fish in three different orders: Synbranchiformes (swamp eel [Synbranchus marmoratus]), Cyprinidontiformes (platyfish [Xiphophorus maculatus] and green swordtail [X.
G M, Somoza, D W, Lescheid, L A, Miranda, F L, Lo Nostro, L, Magliulo-Cepriano, A D, Montaner, M P, Schreibman, J E, Rivier, N M, Sherwood   +8 more
openaire   +2 more sources

Assessing Conflict Potential Between Birds and Small‐Scale Fisheries in Lake Titicaca

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 4, April 2026.
ABSTRACT Globally, fisheries bycatch constitutes a threat to aquatic birds. However, while the threat is global, the threat from bycatch in inland fisheries, and from artisanal or small‐scale fishing, is particularly understudied. Here, we present the first attempt to map the vulnerability of birds to fisheries bycatch, and the conflict potential ...
D. A. Villar, Paola Velásquez‐Noriega, Bastian Thomsen, Edwin R. Gutiérrez Tito, Anahi Cosky Paca‐Condori, Edmundo G. Moreno Terrazas, Ronald Hinojosa Cárdenas, Alfredo Balcón Cuno, Carmen Villanueva, Patrick Chapman, Jhazel Quispe, Andrew G. Gosler   +11 more
wiley   +1 more source