O crescimento de Parastacus defossus (Crustacea: Decapoda: Parastacidae)

Noro, Clarissa Köhler; Buckup, Ludwig

doi:10.1590/s1984-46702009000100009

Cited by 12 publications

(13 citation statements)

References 11 publications

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“…En general, los parámetros Lc ∞ y K obtenidos en P. pugnax son mayores a los estimados en las especies brasileñas P. defossus (Noro & Buckup, 2009) y P. brasiliensis (Fries, 1984;Fontoura & Buckup, 1989), pero inferiores a los determinados en otros crustáceos dulceacuícolas explotados comercialmente, como Procamburus clarkii (Anastácio & Marques, 1995;Fidalgo et al, 2001;Chiesa et al, 2006;Scalici & Gherardi, 2007;Scalici et al, 2009), y Cherax quinquecarinatus (Beatty et al, 2005) …”

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Crecimiento del camaron excavador Parastacus pugnax (Poeppig, 1835) determinado mediante tecnica de marcaje

Ibarra¹,

Arana²

2011

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RESUMEN. Para determinar el crecimiento en el camarón excavador (Parastacus pugnax) en la zona centro sur de Chile se utilizó un marbete tipo cinturón. Los parámetros longitud cefalotorácica asintótica (Lc ∞ ) y la velocidad de incremento en longitud y peso (K), se establecieron mediante el método de Gulland & Holt (1959). El parámetro t 0 se determinó mediante la ecuación inversa del modelo de von Bertalanffy, estableciéndose que las curvas de crecimiento en longitud y peso fueron definidas por los parámetros K = 0,35 mm año -1 , t 0 = -0,38 años, Lc ∞ = 55,9 mm y W ∞ = 83,8 g, valores similares a los de Samastacus spinifrons, especie chilena de alto potencial de cultivo, y de otros parastácidos sudamericanos, tales como P. brasiliensis y P. deffosus. Palabras clave: crecimiento, marcaje-recaptura, camarón excavador, Parastacus pugnax, Chile. Growth of burrowing crayfish

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Crecimiento del camaron excavador Parastacus pugnax (Poeppig, 1835) determinado mediante tecnica de marcaje

Ibarra¹,

Arana²

2011

lajar

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“…However, these proportions were as expected (1:1) for the sexes. The same was true of Parastacus defossus (Noro & Buckup, 2009), P. brasiliensis (Fontoura & Buckup, 1989a, 1989b, and other Parastacidae species (Noro & Buckup, 2009). The sexual proportions with respect to the length, in general, showed predominance of males in most length ranges.…”

Section: Discussionmentioning

confidence: 68%

Biological parameters of the burrowing crayfish, Parastacus pugnax (Poeppig, 1835), in Tiuquilemu, Bio Bio Region, Chile

Ibarra¹,

Arana²

2012

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ABSTRACT. In order to determine the biological parameters of the burrowing crayfish (Parastacus pugnax), we fenced in 900 m 2 of a humid, low-lying sector in Tiuquilemu, Bío-Bío Region, Chile. Monthly samples were taken from August 2007 to August 2008, and 3,512 specimens were caught. Records were made of their carapace length (CL), total weight (TW), sex, and number of eggs (for females). The monthly size-structures showed few juveniles between 20 and 30 mm CL in nearly all months. P. pugnax was found to carry eggs from mid-spring through late autumn; size at first maturity for females was 38.1 mm CL; and fecundity varied between three and 45 eggs per female. In terms of the global sexual proportion, males were predominant in 11 of the 12 months, although the ratio was as expected (1:1). We estimated the parameters of the growth curve using modal progression analysis, obtaining CL ∞ , K, and t 0 values of 55.3 mm, 0.23 mm year -1 , and -0.58 years, respectively. The length-weight relationship was calculated separately for males and females, and no significant differences were found between sexes. The common parameters defining the potential function of a = 0.00052 and b = 2.98 (P < 0.05) indicated isometric increments in weight. . A un total de 3.512 especímenes se les registró la longitud cefalotorácica (CL), peso total (TW), sexo y en hembras se determinó el número total de huevos. Se construyeron las estructuras de longitudes mensuales con escasa representación de juveniles entre 20 y 30 mm de CL, en casi la mayoría de los meses. Se determinó que el período de incubación en P. pugnax se extiende entre mediados de primavera y finales de otoño, la longitud de primera madurez en las hembras se calculó en 38,1 mm de CL y la fecundidad varió entre tres y 45 huevos por hembra. En cuanto a la proporción sexual global, hubo predominio de machos en 11 de los 12 meses; no obstante, estas no difieren de la razón esperada 1:1. Se estimaron los parámetros de la curva de crecimiento mediante el método de análisis de progresión modal, obteniéndose valores de CL ∞ , K y t 0 , correspondientes a 55,3 mm, 0,23 mm·año -1 y -0,58 años, respectivamente. La relación longitud-peso se calculó en machos y hembras separadamente, no existiendo diferencias significativas entre sexos, con parámetros comunes que definen la función potencial de a = 0,00052 y b = 2,98 (P < 0,05), estableciéndose que el crecimiento en peso es de tipo isométrico.

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“…This species, like others of the genus, builds subterranean habitations and has several morphological characteristics related to this mode of life, such as reduction in abdomen size, direct development, and the presence of barriers that reduce the possibility of dispersion. The subterranean tunnels are inhabited generally by one animal, but some galleries contain two (Noro 2007). The low density of the animals may represent a barrier that reduces the possibility of dispersion.…”

Section: Discussionmentioning

confidence: 99%

Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)

Silva-Castiglioni

Greco

Oliveira

et al. 2008

Invertebrate Biology

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Abstract. Freshwater crayfishes of the genus Parastacus are intersex, i.e., show characteristics of both sexes in the same individual; also, intersexuality has been documented in hermaphroditic species. The aim of this study was to analyze the gonads of Parastacus varicosus, characterizing its sexual pattern. The animals were collected at Cova do Touro, Gravataí, Rio Grande do Sul, Brazil. Three sexual forms were identified: intersex females, intersex males, and transitional specimens showing an ovotestes gonad that could only be identified by means of histological analysis. All specimens had two pairs of gonopores and gonoducts. The oviduct had a wider diameter in females, whereas in males the vasa deferentia were more developed. Gonads were composed of two parallel structures located in the cephalothorax. Female gonads were classified into three stages. The presence of transitional specimens may indicate that sex change occurs, with protandric hermaphroditism, as observed in other species of Parastacus. Because previous studies had demonstrated that P. varicosus is a gonochoristic species in a population from Uruguay, the present study addressed the possibility that the sexual pattern depends on differences in environmental factors among populations. To improve understanding of evolution of hermaphroditism in these crustaceans, their reproductive dynamics should be studied, including identification of the factors stimulating male and female functions.

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O crescimento de Parastacus defossus (Crustacea: Decapoda: Parastacidae)

Cited by 12 publications

References 11 publications

Crecimiento del camaron excavador Parastacus pugnax (Poeppig, 1835) determinado mediante tecnica de marcaje

Crecimiento del camaron excavador Parastacus pugnax (Poeppig, 1835) determinado mediante tecnica de marcaje

Biological parameters of the burrowing crayfish, Parastacus pugnax (Poeppig, 1835), in Tiuquilemu, Bio Bio Region, Chile

Characterization of the sexual pattern of Parastacus varicosus (Crustacea: Decapoda: Parastacidae)

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