LENGTH-WEIGHT RELATIONSHIP, CONDITION FACTOR AND SEX OF Pseudoxiphophorus bimaculatus IN A BORDO AT MORELOS STATE
LENGTH-WEIGHT RELATIONSHIP, CONDITION FACTOR AND SEX OF Pseudoxiphophorus bimaculatus IN A BORDO AT MORELOS STATE
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DOI: https://doi.org/10.22533/at.ed.813462414082
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Palavras-chave: Dimorfismo sexual, condición, alometría
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Keywords: Sexual dimorphism, condition, allometry
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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