8 research outputs found

    A case of bilateral hypertrophy in the chelae of a male specimen of Minuca rapax (Smith, 1870) (Decapoda, Brachyura, Ocypodidae)

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    Abstract The present study describes the first record of bilaterally hypertrophied chelipeds in a male fiddler crab, Minuca rapax (Smith, 1870), collected in the mangrove area near the city of Jaguaribe, located in the northern portion of Itamaracá Island in Pernambuco, Brazil. This particular specimen was captured by hand as it emerged from its burrow. Of the total 126 individuals (48 females and 78 males) of the genus Minuca (Bott, 1954) captured, only one presented chelipeds similar in size and shape. Some of the causes of malformation in decapods have been attributed to a double generation of growth areas or non-synchronous regenerative coordination in wound healing. Due to the lack of studies on the definitive cause of these abnormalities and deformations, further investigations are required to determine the roles of individuals with abnormalities within populations as well as the principal causes of these abnormalities

    Biología reproductiva del candil gallito Holocentrus adscensionis (Osbeck, 1765) caputrado frente a las costas de Pernunbuco, Brasil

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    In the present work, specimens of Holocentrus adscensionis, caught off Pernambuco State, northeast Brazil, by small scale artisanal fishing boats, were analyzed with regard to gonad maturation, gonad index, size at first sexual maturity, fecundity, type and time of spawning. Two hundred and three specimens were randomly collected, 102 males and 101 females, resulting in a sex ratio very close to 1:1. Size at first sexual maturity was estimated at 14.6 cm fork length, which is smaller than the most caught size class. Females in final maturation were only recorded from October to March, while the proportion of resting females was the highest in June and July. The seasonal variation of sexual stages, together with the variation of the monthly mean gonad index, with the lowest values for females being recorded from May to July, suggests lower sexual activity for this species during this period of the year, which coincides with winter time. The pattern of ovarian development indicates that spawning is synchronous, with oocytes ripening in more than two groups. It is therefore characterized as a batch spawning. Absolute fecundity ranged from 56274 to 249863 oocytes.En el presente estudio se analizó la madurez gonadal, índice gonadosomático, edad de primera madurez, fecundidad y tipo y periodo de puesta de los especimenes de Holocentrus adscensionis, capturados frente al estado de Pernambuco (noreste de Brasil) por pequeños barcos de la flota artesanal. Se tomó una muestra al azar de 203 especimenes, 102 machos y 101 hembras, obteniéndose una relación de sexos próxima a 1:1. Se estimó la edad de primera madurez a los 14.6 cm de longitud total, menor a la mayoría de tallas capturadas. Hembras en el estadio final de maduración fueron únicamente recolectadas de octubre a marzo, mientras que la más alta proporción de hembras en reposo fue de junio a julio. La variación estacional de estadios sexuales, junto con la variación mensual del índice gonadosomático medio (con los menores valores para las hembras de mayo a julio), sugiere una menor actividad sexual de la especie durante este periodo del año (invierno). El patrón de desarrollo ovárico indica que la puesta está sincronizada con la maduración de los oocitos y tiene lugar en más de dos grupos, siendo pues característica de puestas parciales. La fecundidad absoluta fue de 56274 a 249863 oocitos
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