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Differential growth of the brown mussel, Perna perna (Linnaeus, 1758), in longline and pole cultures in Dakhla Bay ( SW Morocco, Atlantic Ocean)
Author(s) -
Ait Chattou El mustafa,
Abounahel Najem,
Kassila Jawad,
Ouagajjou Yassine,
Abouhala Abderrahmane,
Idhalla Mohamed,
Moukrim Abdellatif
Publication year - 2019
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.13927
Subject(s) - mussel , biology , perna perna , perna viridis , bay , fishery , shellfish , mariculture , dry weight , zoology , bivalvia , mollusca , aquaculture , ecology , oceanography , aquatic animal , botany , fish <actinopterygii> , geology
There is a great interest in establishing mussel farming in Dakhla bay. Selection of suitable sites is more meaningful only if a reliable culture method at proposed site is included. We compared two different culture methods, longline and pole, over 1 year (June 2016 to June 2017). Growth indicators for Perna perna (size and weight growth rates, frequency distributions and estimating growth curves) were analysed from seeding to harvest. The results highlighted the influence of culture method on growth rates of mussels ( p < 0.05). At harvest, individuals reared on longline presented higher growth rates and consequently reached greater weight and length values than those reared on pole. Mussels reared at the longline grew 73.2 mm and gained 53.5 g W L (live weight) and 3.3 g W t (tissue dry weight) after 12 months of cultivation. However, mussels cultured at the pole gained only 52.3 mm, 26.7 g W L and 1.6 g W t . Aerial exposure of mussels at low tides could explain this reduced performance on pole compared with longline. Size frequency distributions at harvest fitted bimodal distribution in both cultures due to an asymmetric competition among individuals. Effect of density started in both treatments after 7 months of culture when mussels reached 60–70 mm, implying an increment of their food and space requirements. To prevent overcrowding, the initial density should have been reduced through “thinning‐out.” The longline method exhibited high‐performance growth and hence is highly recommended for cultivation of P. perna in Dakhla bay.