Diet of Chaceon notialis (Decapoda, Brachyura) off the coast of Rio Grande, RS, Brazil

Domingos, Sergio Santos; Athiê, Alessandro Augusto Rogick; Rossi-Wongtschowski, Carmen Lúcia del Bianco

doi:10.1590/s1679-87592007000400009

Cited by 7 publications

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“…In these cases, males tend to search for receptive females that release pheromones and defend them from other competing males; this seems to agree with the general knowledge about mating in Geryonidae. Considering this "search-and-defend" strategy (sensu Christy, 1987) and the opportunistic scavenging/predatory behavior reported for geryonid crabs (Hastie, 1995;Kitsos et al, 2005;Domingos et al, 2007Domingos et al, , 2008, the increase in general body size might play a more significant role in the survivorship and reproductive success of the group than, for instance, disproportionate chelae growth. Investing in a bigger body should improve the locomotory ability of the crabs and, consequently, their capacity to locate mates and food resources that are dispersed widely over the sea-bed.…”

Section: Discussionmentioning

confidence: 99%

Sexual maturity of the deep sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil

Pezzuto

Sant’Ana

2009

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ABSTRACT. The royal crab Chaceon ramosae is one of the three species of deep-sea crabs currently exploited in Brazil. The royal crab fishery started in 2001 with foreign vessels that were extensively monitored by observers and tracked by satellite. A management plan implemented in 2005 was based only on biomass dynamics, as biological knowledge of the resource was limited at that date. Samples taken aboard were used to determine size at first sexual maturity for males and females by studying the use of allometric growth of chelae and abdomen in relation to carapace width (CW), the proportion of females with opened vulvae and eggs in the pleopods, and males showing copula marks on the first ambulatory legs. Morphometric maturity was attained, on average, at 12.1 cm (males) and 10.7 cm (females). The CW 50% was estimated to be 10.9 cm and 12.2 cm for females, respectively considering the vulva condition and eggs in the pleopods, and 13.6 cm for males. By size class, the maximum estimated proportions of ovigerous females by size class was 0.4 and of males with copula marks was 0.6, suggesting a bi-annual reproductive cycle for individuals of the species. The size composition analysis showed that immature individuals may comprise up to 70% of the catches. These results indicate the need to consider enhanced trap selectivity and lower mortality of ovigerous females as new and immediate goals to improve resource management. Keywords: deep-water resources, reproduction, trap fisheries, relative growth, sexual maturity, Geryonidae, Chaceon ramosae, continental slope, Brazil. se implementó un plan de manejo, considerando solamente el estudio de la dinámica de la biomasa del recurso, ya que el conocimiento biológico todavía era limitado. A partir de muestras obtenidas a bordo de los barcos de pesca, se estimó la talla de primera madurez de machos y hembras a través de la utilización del crecimiento alométrico de la quela y el abdomen con respecto al ancho del caparazón (CW), proporción de hembras con vulvas abiertas y huevos en los pleópodos, y machos con marcas de cópula en las primeras patas ambulatorias. La madurez morfométrica de los machos fue obtenida en promedio a 12,1 cm CW y en las hembras a 10,7 cm CW. El CW 50% fue estimado en 13,6 cm en machos y, en hembras considerando la condición de la vulva o los huevos en los pleópodos, en 10,9 y 12,2 cm respectivamente. La máxima proporción estimada de hembras ovígeras y machos con marcas de cópula por talla fueron de 0,4 y 0,6 respectivamente, lo que sugiere que el ciclo reproductivo a nivel individual es bi-anual. El análisis de la composición de tallas evidenció que individuos inmaduros componen hasta el 70% de las capturas. A partir de estos resultados, se consideró incrementar el efecto selectivo de las trampas y disminuir la captura de hembras ovígeras, como objetivos nuevos e inmediatos para mejorar el manejo de este recurso. Palabras clave: recursos de profundidad, reproducción, pesca con trampas, crecimiento relativo, madurez sexual, Geryonidae, Chaceon ramosae,...

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Section: Discussionmentioning

confidence: 99%

Sexual maturity of the deep sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil

Pezzuto

Sant’Ana

2009

lajar

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“…The main studies consisted of dolphins [ 39 – 41 ], sharks [ 42 – 45 ], dogfish [ 46 ], large pelagic fish [ 43 , 47 ], Thunnus atlanticus [ 48 ], grouper [ 49 ], Lutjanus spp. [ 50 ], Coryphaena hippurus [ 43 ], Euthynnus alletteratus [ 51 ], octopus and squid [ 52 – 54 ], carnivorous zoobenthos [ 55 – 57 ], detritivorous zoobenthos [ 57 , 58 ], and Scomberomorus brasiliensis , Seriola fasciata , Cynoscion jamaicensis , and S . cavalla (fishbase.org) ( S3 Table ).…”

Section: Methodsmentioning

confidence: 99%

More than Anecdotes: Fishers’ Ecological Knowledge Can Fill Gaps for Ecosystem Modeling

et al. 2016

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BackgroundEcosystem modeling applied to fisheries remains hampered by a lack of local information. Fishers’ knowledge could fill this gap, improving participation in and the management of fisheries.MethodologyThe same fishing area was modeled using two approaches: based on fishers’ knowledge and based on scientific information. For the former, the data was collected by interviews through the Delphi methodology, and for the latter, the data was gathered from the literature. Agreement between the attributes generated by the fishers’ knowledge model and scientific model is discussed and explored, aiming to improve data availability, the ecosystem model, and fisheries management.Principal FindingsThe ecosystem attributes produced from the fishers’ knowledge model were consistent with the ecosystem attributes produced by the scientific model, and elaborated using only the scientific data from literature.Conclusions/SignificanceThis study provides evidence that fishers’ knowledge may suitably complement scientific data, and may improve the modeling tools for the research and management of fisheries.

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“…The analysis of animals caught with traps using heads and pieces of fish as bait does not permit to quantify the real importance of Teleostei in the diet because the bait itself introduces an error. However, in another study with Chaceon notialis collected exclusively by bottom trawl (DOMINGOS et al, 2007) Teleostei occurred in 25% of the foreguts, demonstrating that fish is indeed an important resource for that species. Considering that both species presented similar items in their diets, possibly, Teleostei is equally important in the diet of C. ramosae.…”

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confidence: 92%

Diet of Chaceon Ramosae (Decapoda, Brachyura) on the southern brazilian exclusive economic zone

2008

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Diet of Chaceon notialis (Decapoda, Brachyura) off the coast of Rio Grande, RS, Brazil

Cited by 7 publications

References 4 publications

Sexual maturity of the deep sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil

Sexual maturity of the deep sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil

More than Anecdotes: Fishers’ Ecological Knowledge Can Fill Gaps for Ecosystem Modeling

Diet of Chaceon Ramosae (Decapoda, Brachyura) on the southern brazilian exclusive economic zone

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