Estimating the Potential Production of the Brown MusselPerna perna(Linnaeus, 1758) Reared in Three Tropical Bays by Different Methods of Condition Indices

Abstract

Perna perna (Linnaeus, 1758) is the main marine bivalve mussel yielded commercially in Brazil. In spite of this, scientific data is very scarce regarding its productivity in tropical shallow waters. The Condition Index (CI) is used worldwide in mariculture to assess animal health, harvest time, and yield. In this study, the authors used CI results from nine different methods to assess the season effect on the mussel CI and also to evaluate the potential yield of three southern Brazilian bays. The results from nine CI methods were used for the comparison of the seasonality and yield of mussels reared in three marine bays. Sampling was carried out monthly within two 4-month periods, from December 2008 to August 2009. The results show a trend for seasonal effects on the CI results. The winter months showed the highest and the lowest values. Between bays, higher CI values were detected in animals reared at Sepetiba Bay, followed by Guanabara Bay and Ilha Grande Bay. We suggest that the CI (that considers the ratio between bivalve soft tissue wet weight and total length) should be used by fishermen, since this formula was able to detect differences between sites and is more easily applied.

Disease threats to farmed green-lipped mussels Perna canaliculus in New Zealand: review of challenges in risk assessment and pathway analysis

“…Furthermore, only 2 other species in the Perna genus are known to exist globally: P. viri dis in the Indo-Pacific region (FAO 2017) and P. perna in the tropics, subtropics and, recently, Gulf of Mexico (GISD 2019). Although these are cultivated or harvested in many countries, knowledge of disease occurrence and susceptibility is sparse (Vakily 1989, Lasiak 1993, Kaehler & McQuaid 1999, da Silva et al 2002, Galvao et al 2015, FAO 2017.…”

Herramientas para el mantenimiento de la almeja amarilla Mesodesma mactroides en condiciones experimentales de cautiverio

“…Se registró la mortalidad diariamente y se evaluaron las curvas de sobrevivencia y el tiempo medio de sobrevivencia. Los cambios en la condición corporal se evaluaron mediante el índice IC = Masa Seca de Pulpa (MSP, g)/Masa Seca Total (MST, g), que puede ser estimado utilizando instrumentos y cálculos simples (Galvao, et al, 2015). La obtención de la MST se realizó secando las muestras en estufa a 45 ± 5 ℃ hasta obtener una masa constante.…”

To what extend the dam dredging can influence the background level of metals in the Rhine River: using chemical and biological long-term monitoring to answer

“…Mat.). As recommended by a previous study (Galvao et al, 2015), the CI was calculated as the ratio between the wet weight of soft tissues and the total length of shells and used to monitor the physiological status during transplantation (Bourgeault et al, 2010b;Bourgeault et al, 2011). For the first two transplantations of March and December 2011, significant decreases in weight associated with increases in mortality, were observed during summers 2011 and 2012 when compared to the reference CI established on freshly-collected organisms (Fig.…”

“…Such decreases in CI have been related to low food availability and/or reproductive stage (e.g. primary spawning during the summer) in freshwater and marine mussels (Bourgeault et al, 2010b;Bourgeault et al, 2011;Galvao et al, 2015). Consequently, bioaccumulation data from caged mussels retrieved after July 2011 and 2012 were not included in the results insofar as CI decreases can reflect the biological alterations of mussels including metal bioaccumulation.…”