Environmental parameters and growth performance of Green Mussel, Perna Viridis in Marudu Bay

• 主要作者: Afizah Mohd. Taib
• 格式: Thesis
• 语言: 英语; 英语
• 出版: 2017
• 主题: QL360-599.82 Invertebrates
• 在线阅读: https://eprints.ums.edu.my/id/eprint/44310/1/24%20PAGES.pdf; https://eprints.ums.edu.my/id/eprint/44310/2/FULLTEXT.pdf

Green mussel ( Perna viridis) is one of the most highly demanded bivalve species that fetches high market price in the Southeast Asian region. However, market supply of this species is still very much dependent on traditional farming using wild seeds. The complete cycle aquaculture of this species is still not reliable in this part of the world. The present study was conducted to determine the population parameters and effect of environmental factors to growth performance of this species in Marudu Bay after the occurrence of massive mortality. One year sampling period started in April 2013 to March 2014 was carried out. In which, monthly water quality, morphometric measurement of green mussel samples and analyses of water nutrients and chlorophyll-a were conducted throughout the sampling period. The population parameters of the green mussel were analysed by usin the FiSAT software based on the length frequency data. The relationship between the green mussel density and the environmental factors was analysed by using bivariate tests. The growth of raft-grown green mussel population showed high asymptotic length (Loo), growth coefficient (K) and growth performance index ( q;' estimated at 113.4 mm, 1.7 yea(1 and 4.34, respectively.The study revealed that the green mussel experienced high mortality rate(Z=3.4/year, F= 1.6/year, M=l.8/year) and low percentage of recruitment every month (ranged from 1.51 % to 18.59%). However, the water quality at the farm site was found to be ideal for green mussel cultivation. In general, this study had demonstrated that Marudu Bay is a potential area for green mussel farming. However, insufficient numbers of mussel spawners available in the bay after a mortality event could have influenced the low recruitment rate. Nevertheless, changes in environmental parameters, such as increase in water temperature and water velocity may have disturbed or delayed the attachment process of green mussels on substrates, hence resulting in low settlement density. The low dissolved oxygen and high amount of phosphorus may have also affected the settlement density of the green mussel in the bay. This study recommends that the sustainability of green mussel farming in Marudu Bay could be enhanced by the addition of healthy broodstock, controlled harvesting, use of new culture substrates and culture techniques, spat production in hatchery and minimizing pollution into the bay.