Informes Técnicos del Departamento de Aguas Continentaleshttp://hdl.handle.net/1834/176082024-03-28T22:48:13Z2024-03-28T22:48:13ZEdad de la trucha arco iris (Salmo gairdneri) de la laguna Zeta (Prov.de Chubut)Guerrero, C.A.Lafarga, A.http://hdl.handle.net/1834/195822021-07-10T01:50:57Z1986-01-01T00:00:00ZEdad de la trucha arco iris (Salmo gairdneri) de la laguna Zeta (Prov.de Chubut)
Guerrero, C.A.; Lafarga, A.
Age of a population of rainbow trout (Salmo gairdneri) from a pond in Patagonia was studied by means of scale readings. The population was sampled three times, on December 1984, March 1985 and March 1986. Length at age was back-calculated from growth marks on scales, using the Fraser-Lee equation. By the analysis of length distributions and numbers of marks on scales from each sample, it was concluded that this population was formed by a single cohort, born in spring 1982 and stocked shortly after. Stocking rate is unknown. Significant differences (P0.05) were found between back-calculations of length at age 1 from samples of December 1984 and March 1986. These differences were probably due to length-scale radius relation. Evidences from scales suggested that a single mark is formed each year, during early-mid spring. On the other hand, according to availabe data from the literature for the same species, this population has presented one of the highest growth rates. (pdf contains 15 pages)
1986-01-01T00:00:00ZFactores que afectan la distribución de salmónidos en ArgentinaQuirós, R.http://hdl.handle.net/1834/195732021-07-09T03:29:47Z1991-01-01T00:00:00ZFactores que afectan la distribución de salmónidos en Argentina
Quirós, R.
The introductions of salmonids in Argentina can be considered as successfull. The have become established as reproducing populations in southern and middle-western lakes and reservoirs. An extensive sampling programme on 112 lakes and reservoirs was carried out during the summers of 1984 to 1987. Environmental features that determine their present distribution were analyzed. The hypothesis, which we used as starting-point, is that it has been attempted to introduce at least once and least one species of salmonids in all lakes and reservoirs of Argentina.
1991-01-01T00:00:00ZProyecto de relevamiento de los recursos pesqueros del Río de la Plata. Parte II: Tablas y FigurasCandia, C.R.Nion, H.http://hdl.handle.net/1834/195722021-07-09T03:29:17Z1990-01-01T00:00:00ZProyecto de relevamiento de los recursos pesqueros del Río de la Plata. Parte II: Tablas y Figuras
Candia, C.R.; Nion, H.
1990-01-01T00:00:00ZEvaluación del rendimiento pesquero potencial de la República Argentina: III. Edad y crecimiento de peces 1Guerrero, C.A.Lafarga, A.Cataldo, D.H.Quirós, R.http://hdl.handle.net/1834/195712021-09-18T23:13:05Z1990-01-01T00:00:00ZEvaluación del rendimiento pesquero potencial de la República Argentina: III. Edad y crecimiento de peces 1
Guerrero, C.A.; Lafarga, A.; Cataldo, D.H.; Quirós, R.
Age and growth of populations of three fish species from sixteen lakes and reservoirs situated in the Patagonian Andean and the Patagonian Plateau Region (Argentina) were studied. They included two native species, the Patagonian smallmouth perch. (Percichthys trucha) and the Patagonian silverside (Patagonina hatcheri) and the introduced rainbow trout (Oncorhynchus mykiss). For the three species backcalculated lenght at age was obtained from scale readings. Von Bertalanffy growth curves were usually adjusted to data. For the three species, faster growth was related with lake productivity. (Document contains 38 pages.)
1990-01-01T00:00:00Z