Intraspecific interactions in the mangrove crab Ucides cordatus (Decapoda: Ocypodidae) during the metamorphosis and post-metamorphosis periods under laboratory conditions

Ventura, Raissa Wihby; Silva, Ubiratã A. T. da; Ostrensky, Antônio; Cottens, Kelly Ferreira

doi:10.1590/s1984-46702011000100001

Cited by 3 publications

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“…During this period, several issues related to this technology were investigated, such as larvicultural methods (Silva et al 2006(Silva et al , 2009, food protocols for larvae (Becker et al unpublished results), cannibalism and intraspeciϐic antagonistic interactions (Ventura et al 2008(Ventura et al , 2011. One of the most limiting factors affecting the larviculture efforts is a period of high mortality, which usually occurs late in the course of the larviculture during the metamorphosis from zoeal to the megalopal stage.…”

Section: Introductionmentioning

confidence: 99%

Different pathways in the larval development of the crab Ucides cordatus (Decapoda, Ocypodidae) and their relation with high mortality rates by the end of massive larvicultures

et al. 2012

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One of the most limiting factors affecting the larval rearing of Ucides cordatus in the laboratory is a period of high mortality, which usually occurs late in the course of the larviculture during the metamorphosis from the zoeal to the megalopal phase. The objective of the present research was to analyze the post-embryonic development of U. cordatus on an individual basis and, in particular, to search for patterns linking disturbances in the molting process to the high larval death rates observed in massive larvicultures. A total of 50 larvae were individually reared from hatching to metamorphosis into the megalopal phase under controlled conditions, fed a combination of microalgae and rotifers. The survivorship rate was 70% until zoea V. The 35 surviving zoea V larvae followed two different pathways. Eleven underwent metamorphosis directly to megalopa, eighteen molted to zoea VI and six died as zoea V. In the last molting event, only two zoea VI larvae reached the megalopal stage, while the remaining sixteen died. In further observation under microscope, 13 of the dead zoea VI showed characteristics of the pre-molt stage and pereiopods disproportionably large in relation to the carapace. The observed pattern resembles the Molt Death Syndrome (MDS) described for other decapod species, in which larvae die in the late pre-molt phase of the molting cycle. We suggest that U. cordatus larvae develop disturbances in the molting process similar to the MDS described for other species and that these disturbances are related to a more complex pathway involving the emergence of larval stage zoea VI. (Linnaeus, 1763) em laboratório é um período de alta mortalidade, o qual usualmente ocorre no ϐim do curso da larvicultura durante a metamorfose da fase de zoea para a de megalopa. O objetivo da presente pesquisa foi analisar o desenvolvimento pósembrionário de U. cordatus em uma base individual e, em particular, procurar por padrões ligando distúrbios no processo de muda com as altas taxas de mortalidade observadas nas larviculturas massivas. Um total de 50 larvas foram cultivadas individualmente da eclosão até a fase de megalopa em condições controladas, alimentadas com uma combinação de microalgas e rotíferos. A taxa de sobrevivência foi de 70% até zoea V. As 35 larvas zoea V sobreviventes seguiram dois diferentes caminhos. Onze realizaram a metamorfose diretamente para megalopa, dezoito Pesq. Vet. Bras. 32(4):284-288, abril 2012 285 The larval development of the crab Ucides cordatus and their relation with high mortality rates by the end of massive larvicultures mudaram para zoea VI e seis morreram como zoea V. No último evento de muda, apenas duas larvas zoea VI atingiram a fase de megalopa, enquanto as dezesseis restantes morreram. Em investigação posterior sob microscópio, 13 das zoea VI mortas mostravam características de estágio de prémuda e pereiópodes desproporcionalmente grandes em relação à carapaça. O padrão observado lembra a Sín-drome da Morte na Muda (MDS) descrita para outras espé-cies de decápodes, na qua...

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Section: Introductionmentioning

confidence: 99%