Variabilidade Nas Taxas Fisiológicas Do Mexilhão Perna Perna Em Dois Sítios De Cultivo Do Litoral Norte De Santa Catarina

Abstract

RESUMOCom a crescente atividade sócio-econômica da mitilicultura na costa do estado de Santa Catarina, problemas relacionados com a identificação de novos sítios de cultivo tornaram-se prioritários. Dentre os mais diferentes métodos utilizados para análise de potenciais regiões produtoras, o estudo das taxas fisiológicas dos mexilhões enquadram-se como uma das mais adequadas, incluindo neste caso, o monitoramento de sítios já estabelecidos e problemas relacionados com a poluição ambiental. Este relatório faz referência a uma preliminar comparação entre duas áreas de cultivo do mexilhão Perna perna no litoral norte do estado (municípios de Penha e Bombinhas). Dados ambientais de temperatura, salinidade, material em suspensão e fisiológicos do mexilhão como crescimento, filtração, respiração e assimilação foram comparados. Os principais resultados deste estudo podem ser resumidos em: relação direta entre a temperatura e a taxa de crescimento e relação entre a salinidade e a taxa de respiração para os dois ambientes. O material em suspensão apresentou uma maior variabilidade ambiental influenciada pelos aportes continentais mas que necessitam de maiores investigações. A importância das taxas de maturação dos folículos embrionários dos mexilhões foi sugerida na relação com as taxas de filtração e assimilação. Em termos de produção, os ambientes mostraram maiores diferenças nos meses frios e similar resultados nos meses quentes. Entretanto, resultados conclusivos estão dependentes de estudos ao longo de um ciclo anual. ABSTRACTWith the growing socioeconomic activity of mussel farming on Santa Catarina's coast, the identification of new cultivation sites became necessary. Among a variety of methods used for the analysis of potential producing areas, studying of the mussel physiological rates may be considered as one of the most appropriated, specially when addressing the monitoring of sites already established and the negative effects of environmental pollution. This report presents a preliminary comparison between two areas of cultivation in the northern coast of the state (municipalities of Penha and Bombinhas). In both locations, environmental data (temperature, salinity and seston) and physiological parameters of the mussels (growth, and filtration, respiration and assimilation rates) were analysed. Our findings suggested a direct relationship between temperature and mussel growth rate and also between salinity and respiration rates for both areas. The seston concentration showed a high environmental variability as a response to the continental drainage. In addition, the filtration and

Continuous Exposure to Microplastics Does Not Cause Physiological Effects in the Cultivated Mussel Perna perna

“…The growth rate (GR) for each of the 80 mussels used in the experiment was estimated as proposed by Resgalla Jr et al (1999). The method considers the variation of weight during the months experiment (i.e., three months).…”

Oysters and mussels as equivalent sentinels of microplastics and natural particles in coastal environments

“…However, in areas under lower anthropogenic pressures and high variations of natural conditions as in S3, C. brasiliana exhibited a suitable performance due its higher capacity to retain particles (1.6±0.9 particles.g -1 ) than mussels (0.6±0.5 particles.g -1 ). This occurs possibly due to its higher filtration rate (5 to 25 L/h) (Resgalla et al, 1999) compared to P. perna (1.5 to 2.5 L/h) (Manzoni, 2001). In addition, the organism distribution along estuarine environments should be a decisive factor for the selection, once C. brasiliana is euryhaline (Oliveira et al, 2018), while P. perna is a stenohaline organism (Bayne, 1967) as already discussed for the stress biomarkers.…”

DIFERENCIAÇÃO GENÉTICA DE ESTOQUES NATURAIS E CULTIVO DO MEXILHÃO Perna perna EM SANTA CATARINA.

“…The culture of Perna perna began in Santa Catarina in 1988, and since then its production has grown up steadily Costa et al, 1998). During 1998 and1999 the production of cultured molluscs increased to 8,500 tons, involving about a thousand of fisherman families. In 2000 was observed the highest value of production (11,365 tons) since the initiation of the culture (Winckler, 2003), but afterwards the production start to decline steadily.…”

“…The evaluation of the degree of conservation through genetic monitoring is needed for subsequent management. Therefore, the aim of the present work was to evaluate the degree of genetic diversity in natural and cultured stocks, and the population subdivision of two Santa Catarina stocks, which are submitted to slightly different environmental conditions (Resgalla Jr. et al, 1999). Allozyme markers has been used in previous studies for analysing the genetic structure of natural populations of P. perna (Silva, 1991;Grant et al, 1992;Neto, 2003) for the eastern and western Atlantic coasts, where moderate subdivision has been found.…”