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Crecimiento y mortalidad natural del pez Haemulon aurolineatum Teleostei: Haemulidae del suroeste de la isla de Margarita, Venezuela. Escuela de ciencias aplicadas del mar, Departamento de acuacultura. The curve of growth in length was fit to the model of von Bertalanffy, and described anexponential curve, where growth accelerated until the two years of age. Epub September Se muestreo un total de 2 ejemplares, desde julio de hasta junio de La estructura de tallas de la muestra estuvo comprendida desde

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The length-weight relationship and condition factor K are useful descriptors in population fish biology, because they provide essential information on growth strategies, nutritional status and reproduction. They are also parameters widely used to compare the condition of aquatic systems with varying degrees of human intervention.

Therefore, understanding the dynamics of populations in pristine ecosystems, provides relevant basic information to understanding changes or effects in populations under these pressures.

The San Pedro river Valdivia basin , southern Chile, is a system characterized by its current low intervention level, high fish diversity and low abundance of introduced species. We describe the length-weight relationship and condition factor of 12 native fish of the San Pedro river, for over two annual cycles, analyzing their growth strategies and seasonal variability in condition factor.

The results of the length-weight show that the most of species exhibit isometric growth, especially Diplomystes camposensis, Basilichthys australis and Brachygalaxias bullocki, however, some species have a tendency to allometry Galaxias maculatus, Galaxias platei and Trichomycterus areolatus.

The values of K show that species such as Percilia gillissi have a strong annual variability, associated with the breeding season and greater supply of food. We give this information as baseline data to understand the functioning of fish populations in natural conditions and to be used for the evaluation of future projects that may impact these ecosystems. Keywords: San Pedro river, weight-length relationship, K, native fish. Ello permite efectuar estudios comparativos interpoblacionales Granado ; Arismendi et al.

Percilia gillissi Girard , Galaxias maculatus Jenyns , Galaxias platei Steindachner , Trichomycterus areolatus Valenciennes , Diplomystes camposensis Arratia , Cheirodon australe Eigenmann y Brachygalaxias bullocki Regan En cambio especies como Basilichthys australis Eigenmann , Odontesthes mauleannum Steindachner y Geotria australis Gray , estuvieron representadas principalmente por estados larvales y juveniles. Tabla 1. Table 1. Figura 1. Figure 1. Size frequency distribution for 12 native species from San Pedro river, by standard length.

Figura 2. Figure 2. Relationships between b and Log a parameters of 12 native species from San Pedro river. En cuanto a K Fig. En este sentido, P. Estas corresponden a G. A taeniatus y G. A finales de invierno, T. Para G. Figura 3. Figure 3. Las especies B. Estas especies mostraron gran representatividad de tallas, por lo cual estos valores evidencian una tendencia general al aumento del grosor proporcional a la talla durante el crecimiento. De hecho, Habit et al. En tanto que para G.

En particular, las fechas con bajos K observados para G. Las alzas de K entre junio-septiembre Fig. No obstante, Barriga et al. Por otra parte, varios individuos de Ch. Desafortunadamente, tampoco ha sido registrada evidencia directa sobre posturas para Ch.

Por otra parte, alzas de K detectadas entre junio-agosto Fig. Estudios realizados en Ch. En tanto K de G. Barriga et al. Cussac et al. No obstante, uno de los datos relevantes entregado por Barriga et al. Para B. Para estos individuos, sus valores de K rodearon el valor 1,2. Similar a B. Lattuca et al. Zebra a las hembras de 14,2 cm LE, por lo que se espera que estas variaciones se deban a cambios en el estado nutricional de los individuos.

Por otro lado, especies como D. Si bien para D. Por ende, D. Otras especies como T. McPherson et al. Agboola, J. Length-weight relationships of some fresh and brackish water fishes in Badagry Creek, Nigeria.

Journal Of Application Ichthyology Arismendi, I. Body condition indices as a rapid assessment of the abundance of introduced salmonids in oligotrophic lakes of southern Chile.

Lake and Reservoir Management Barriga J. Spatial and temporal distribution of landlocked Galaxias maculatus and Galaxias platei Pisces: Galaxiidae in a lake in the South American Andes. Barriga, J. Annual dynamics variation of a landlocked Galaxias maculatus Jenyns population in a Northern Patagonian river: occurrence of juvenile upstream migration.

Journal of Application Ichthyology Blackwell, B. Early loss of Herring Gull glutches after egg-oiling. Wildlife Society Bulletin 28 1 Buria, L. Movement of a South American perch Percichthys trucha in a mountain Patagonian lake during spawning and prespawning periods. Journal of Fish Biology Campos, H. Breeding season and early development of Brachygalaxias bullocki Osteichthyes: Galaxiidae. The Texas Journal of Science 23 4 Carlander, K. Handbook of freshwater fishery biology. I pp. Chapman, A.

Variation in life history of land-locked lacustrine and riverine populations of Galaxias maculatus Jenyns in Western Australia. Environmental Biology of Fish Cussac V. The distribution of South American galaxiid fishes: the role of biological traits and post-glacial history.

Journal of Biogeography Dyer, B. Systematic review and biogeography of the freshwater fishes of Chile. Froese, r. Cube law, condition factor and weight-length relationships: history, meta-analysis and recommendations. Journal of Applied Ichthyology Granado, C. Secretariado de Publicaciones de la universidad de Sevilla.

Habit, E. Interciencia Gayana 70 1 Killian, E. Susswasserschwamme als ortder Brutpflege eipe Fisches. Naturwissenschaften 56 5 Klink, A. Age and growth, feeding habits, and reproduction of Cauque mauleanum Steindachner Pisces: Atherinidae in southern Chile. Lattuca, M. Reproduction of landlocked Aplochiton zebra Jenyns Pisces, Galaxiidae.

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Allometric growth in cuban gar Atractosteus tristoechus larvae. Universidad de la Habana. Calle No. Of the 17 morphometric characters recorded, only six showed isometric growth describing a continuous and gradual change in a very few body characters. The increase in the length of the head and snout was positively allometric, but their heights and widths were negatively allometric indicating an elongation of the cephalic region that guarantees an efficient food capture. The allometries obtained with respect to the head, trunk and tail growth showed a discontinuity and abrupt changes in many of the body sizes and proportions that occur mainly from age 4

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Allometric growth in cuban gar (Atractosteus tristoechus) larvae

Estas novedades evolutivas. Anadara tuberculosaAnadara similisGeometric morphometric, Pacific coast of Colombia. The other body heights preanal and postanalhowever, recorded an isometric growth Table 1. Four different concepts of allometry are distinguished: The results of the allometric analyses carried out on Cuban gar larvae for the paired and caudal fins, as well as for the growth of the trunk and cephalic region, make it possible to state the following: Balon EK The theory of saltatory ontogeny and life history models revisited. Di or triphasic growth can be described by two or three different growth curves, respectively. A significant morphogenesis occurs during the early development when the larvae need to adequately and timely form somatic and visceral systems, as well as specialised structures for an optimal interaction with the environment Dettlaff et al.

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The length-weight relationship and condition factor K are useful descriptors in population fish biology, because they provide essential information on growth strategies, nutritional status and reproduction. They are also parameters widely used to compare the condition of aquatic systems with varying degrees of human intervention. Therefore, understanding the dynamics of populations in pristine ecosystems, provides relevant basic information to understanding changes or effects in populations under these pressures. The San Pedro river Valdivia basin , southern Chile, is a system characterized by its current low intervention level, high fish diversity and low abundance of introduced species. We describe the length-weight relationship and condition factor of 12 native fish of the San Pedro river, for over two annual cycles, analyzing their growth strategies and seasonal variability in condition factor. The results of the length-weight show that the most of species exhibit isometric growth, especially Diplomystes camposensis, Basilichthys australis and Brachygalaxias bullocki, however, some species have a tendency to allometry Galaxias maculatus, Galaxias platei and Trichomycterus areolatus. The values of K show that species such as Percilia gillissi have a strong annual variability, associated with the breeding season and greater supply of food.

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