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LENGTH-WEIGHT RELATIONSHIP, CONDITION FACTOR AND SEX OF Pseudoxiphophorus bimaculatus IN A BORDO AT MORELOS STATE

La familia Poeciliidae pertenece al orden de los Cyprinodontiformes, son peces pequeños que habitan cuerpos de agua dulce, salobre y son reconocidos como peces de ornato para acuarios y para eliminar mosquitos y sus larvas. El objetivo fue determinar la relación longitud-peso, factor de condición y proporción sexual del guatopote manchado y su relación con los factores ambientales. Se realizaron muestreos mensuales de marzo del 2017 a febrero del 2018 y se capturaron con un chinchorro de 0.005 m de luz de malla. A cada organismo se le tomó la Longitud total (Lt), longitud patrón (Lp), peso total (Pt) y sexo. Adicionalmente se analizaron los parámetros físicos y químicos del agua. Se capturaron 374 peces de Pseudoxiphohporus bimaculatus, con intervalos de talla para hembras de 2.3 a 8.6 cm (peso total de 0.22 a 7.62 g) y machos de 2.6 a 5.8 cm (peso de 0.18 a 2.84 g). La mayor captura se obtuvo en el mes de mayo. El 54.8% fueron hembras (205 organismos), el 31.3% machos (114 individuos) y el resto indefinidos (55 peces). La proporción sexual favoreció a las hembras (1.8:1). La relación talla-peso para las hembras indica crecimiento alométrico positivo (b = 3.09) e igual para los machos, pero los últimos con tendencia a la isometría (b=·3.003) con mayor crecimiento en peso que en talla. El factor de condición de Fulton indica con buena condición en julio para ambos sexos. El microreservorio presenta condiciones adecuadas para el desarrollo y reproducción de P. bimaculatus.
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LENGTH-WEIGHT RELATIONSHIP, CONDITION FACTOR AND SEX OF Pseudoxiphophorus bimaculatus IN A BORDO AT MORELOS STATE

  • DOI: https://doi.org/10.22533/at.ed.813462414082

  • Palavras-chave: Dimorfismo sexual, condición, alometría

  • Keywords: Sexual dimorphism, condition, allometry

  • Abstract:

    The Poeciliidae family belongs to the order Cyprinodontiformes, which are small fish that inhabit freshwater bodies and are recognized as ornamental fish for aquariums and to eliminate mosquitoes and their larvae. The objective was to determine the relationship between length and weight, condition factor’s and sex ratio of Twospot livebearer and its relationship with environmental factors. Monthly samplings were carried out from March 2017 to February 2018 and captured with 0.005 m mesh net. For each organism the total weight (Lt), parent weight (Lp), total weight (Pt) was measured and sex determinate. Additionally, the physical and chemical parameters of the water were analyzed.

     It was captured 374 fish Pseudoxiphohporus bimaculatus, with size ranges for females from 2.3 to 8.6 cm (total weight of 0.22 to 7.62 g) and males from 2.6 to 5.8 cm (weight of 0.18 to 2.84 g). The largest capture was obtained in May. 54.8% were female (205 organisms), 31.3% were male (114 individuals) and the remaining were undefined (55 fish). The sex ratio favors the female (1.8:1). The length-weight relationship for the female sex indicates positive allometric growth (b = 3.09) and the same for the male, but the latter with a tendency to isometry (b=·3.003) with greater growth in weight than in size. The relative condition factor indicates good conditions in July for both sexes. The microreservoir present adequate conditions for the development and reproduction of P. bimaculatus.

  • José Luis Gómez-Márquez
  • Carlos Brindis-Velázquez
  • José Luis Guzmán-Santiago
  • Roberto Trejo-Albarrán
  • María del Carmen Alejo-Plata
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