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Gametogenesis in the mangrove mussel Mytella guyanensis from northern Brazil
2009
Gametogenesis was investigated using histological methods, in Mytella guyanensis from the Caeté mangrove estuary, northern Brazil. The sexes could not be distinguished from macroscopic observations of color. Histology and cellular organization was similar to that previously described for this and other species.
Quantitative evaluation of gametogenesis in the mangrove mussel Mytella guyanensis
Ecotropica
Please support Ecotropica by downloading the article from their site: http://www.gtoe.de/PDF/Ecotropica\_2010\_01/Gomes%20et%20al%202010.pdf The mangrove mussel Mytella guyanensis is a species of both ecological and economic importance. Little information is available concerning its reproductive cycle in Brazil. Given the fact that it is exploited as a food source, and is also an important indicator of ecosystem health, such information may be useful for culture and management. Gametogenesis in M. guyanensis was investigated using histological methods between January 2004 and January 2005 at a site in the Caete mangrove estuary, Braganca, northern Brazil. All animals sampled were mature and varied between pre-spawning, spawning, and recovery stages. Variation in reproductive activity seas similar in both visceral mass and mantle tissue. Male and female cycles were highly synchronous and gametogenesis in both sexes was continuous throughout the year. A number of small peaks in activity...
First record of the Mediterranean mussel Mytilus galloprovincialis (Bivalvia, Mytilidae) in Brazil
Papéis Avulsos de Zoologia
The genus Mytilus comprises a large number of bivalve mollusk species distributed throughout the world and many of these species are considered invasive. In South America, many introductions of species of this genus have already taken place, including reports of hybridization between them. Now, the occurrence of the Mediterranean mussel Mytilus galloprovincialis is reported for the first time from the Brazilian coast. Several specimens of this mytilid were found in a shellfish growing areas in Florianópolis and Palhoça, Santa Catarina State, Brazil. Morphological analysis of the shells and molecular analysis through sequencing of the cytochrome oxidase subunit 1 (COI) confirmed the taxonomic identification. The species is known for its great invasive potential and can become a major environmental problem for seafood business and coastal communities, as it can compete and even hybridize with local species.
Comparative growth of two mussels farmed in the macrotidal mangroves of the Amazon
Ciência Rural
ABSTRACT: The present study evaluated the growth of the species Mytella guyanensis and Mytella strigata on ropes suspended in Amazon Macrotidal Mangrove Coast. The mussels were farmed at a density of 840 ind. m-1 of rope, with the same shell height (mm) and live weight (g) for both species. The experiment was entirely randomized, with two treatments and 15 repetitions. Significant differences were reported regarding the growth (shell height and live weight) between the species (P>0.05). The daily growth rate was greater for M. guyanensis than for M. strigata. At the end of the cultivation cycle, only 451 ± 46 (59.9%) of M. guyanensis individuals reached commercial size per meter of rope compared to 670 ± 73 (89.3%) of M. strigata individuals. Survival rates were similar. Salinity and temperature increased progressively throughout the experiment with the reduction in rainfall and were within the range considered ideal for these species. In conclusion, the farming of both species o...
Zooarchaeological evidence that the brown mussel (Perna perna) is a bioinvader of coastal Brazil
The Holocene, 2018
Interactions between invader species and the local biota may lead to disequilibria in regional ecosystems. For such reason, the cultivation of nonnative species may be prohibited in specific regions, as a means of protecting native species. On the other hand, the question of whether a species is a bioinvader or not may not be straightforward. This is the case of the mollusc Perna perna, presently naturalized and widely distributed along Brazilian coast, from the Bay of Vitória, in the state of Espírito Santo (ES), to the state of Rio Grande do Sul (RS). Following previous works that explored the hypothesis that P. perna invaded the coast of Brazil at the colonial period, attached to slave ships, we discuss zooarchaeological data, radiocarbon dating, and molecular genetics analyses. Out of the 578 archeological shellmounds investigated, 542 (93.8%) had no records of P. perna. From the radiocarbon dating results, it is possible to infer that the presence of the two P. perna specimens ...
Brazilian Archives of Biology and Technology, 2005
The physiological conditions of mussels from Ubatuba and Santos and also of organisms transplanted from Ubatuba to Santos were studied by using different techniques. Assays for lysosomal stability were conducted on the haemolymph. Heart rate activity was monitored for 6h. The embryonic development of larvae obtained from the collected mussels was analysed. For all the compared groups of mussels, no significant differences were observed for the cardiac activity monitoring and the embryonic bioassays. The mean Neutral Red (NR) retention time was similar for the animals from Santos and Ubatuba, whereas the organisms transplanted to Santos showed a reduction in the retention time of the dye, indicating damage in the lysosomal membranes. These differences were possibly due to environmental factors, but further investigations are required to confirm this hypothesis.
Freshwater mussels of Catalão, confluence of Solimões and Negro rivers, state of Amazonas, Brazil
Check List, 2008
The present study provides a species list of freshwater mussels from Catalão, the meeting of the Solimões and Negro rivers, in state of Amazonas, northern Brazil. Expeditions to collect molluscs were carried out between 2004 and 2006, during high and low water seasons. Three hundred and thirty-one bivalve shells, 25 valves, and 57 live specimens of four families and 10 species were identified. A single exotic species, Corbicula fluminea, represented over half the collected shells. All bivalve shells were photographed and registered at the mollusc collection of the Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus.
Journal of Freshwater Ecology, 2010
Limnoperna fortunei (Dunker, 1857) is an invasive freshwater bivalve native to rivers and streams of China and Southeast Asia. In 2001, it was discovered in Itaipú Reservoir, and its population has grown considerably since then. The aim of this study was to estimate density, recruitment, and individual growth of L. fortunei in a subtropical region from a field experiment using an artificial substrate. Samples were collected between December 2004 and December 2005 at Bela Vista Reservoir in Foz do Iguaçu, Brazil. Mussels were counted and measured to generate size-frequency and distribution data. Maximum and minimum densities (± standard deviation) were 204 ± 17 ind.100 cm−2 and 94 ± 22 ind.100 cm−1, respectively. Shell length ranged between 1 and 36 mm, and shell length frequency indicated presence of young mussels with variable densities throughout the period surveyed. The von Bertalanffy model fitted successfuHy in all cases explaining more than 96% of the variation in shell length. Measured growth parameters (k = 2.35 year−1, L∞ = 38 mm) were different from those estimated for populations of L. fortunei in a temperate region.