scholarly journals Field clearance of an intertidal bivalve bed: relative significance of the co-occurring blue mussel Mytilus edulis and Pacific oyster Crassostrea gigas

2016 ◽  
Vol 25 ◽  
pp. 107-119 ◽  
Author(s):  
B Vismann ◽  
M Wejlemann Holm ◽  
JK Davids ◽  
P Dolmer ◽  
MF Pedersen ◽  
...  
Keyword(s):  
Mytilus Edulis ◽  
Crassostrea Gigas ◽  
Pacific Oyster ◽  
Blue Mussel ◽  
Relative Significance

scholarly journals Coexistence of Pacific oyster Crassostrea gigas (Thunberg, 1793) and blue mussels Mytilus edulis Linnaeus, 1758 on a sheltered intertidal bivalve bed?

2016 ◽  
Vol 11 (2) ◽  
pp. 155-165 ◽  
Author(s):  
Mark Wejlemann Holm ◽  
Jens Kristian Davids ◽  
Per Dolmer ◽  
Esbern Holmes ◽  
Thomas Nielsen
Keyword(s):  
Mytilus Edulis ◽  
Crassostrea Gigas ◽  
Pacific Oyster ◽  
Blue Mussels

scholarly journals Filtration and fertilisation effects of the bivalves Mytilus edulis and Magallana gigas on the kelp Saccharina latissima in tank culture

2021 ◽  
Author(s):  
Matthew S. Hargrave ◽  
Anothai Ekelund ◽  
Göran M. Nylund ◽  
Henrik Pavia
Keyword(s):  
Mytilus Edulis ◽  
Pacific Oyster ◽  
Blue Mussel ◽  
Inorganic Nitrogen ◽  
Saccharina Latissima ◽  
Dissolved Inorganic Nitrogen ◽  
Tissue Quality ◽  
Ambient Seawater ◽  
Fouling Organisms ◽  
By Products

AbstractBiofouling by opportunistic epiphytes is a major concern in seaweed aquaculture. Colonisation of fouling organisms contributes to a reduction in algal performance as well as a lower quality crop. Further, epiphyte removal techniques often increase maintenance costs of cultivation systems. There have been a variety of methods to mitigate fouling in tank cultivations of seaweed, including the use of biological controls. Here, we present the use of filter feeding bivalves, the blue mussel (Mytilus edulis) and Pacific oyster (Magallana gigas), as a novel biofilter that also serves as a source of dissolved inorganic nitrogen in tank cultivations of the sugar kelp, Saccharina latissima. We observed significant reductions of fouling epiphytes on seaweed blades of around 50% by bivalve filtration, significant elevations of ammonium (NH4+) and phosphate (PO43−) by bivalves and alterations to kelp tissue quality when co-cultivated with bivalves rather than supplied with ambient seawater. Stable isotope ratios and seawater chlorophyll a concentrations provided evidence for bivalve biofiltration and the incorporation of their by-products into kelp tissue.

scholarly journals Toxicity and histopathological effects of toxic dinoflagellate, Alexandrium catenella exudates on larvae of blue mussel, Mytilus galloprovincialis, and Pacific oyster, Crassostrea gigas

2020 ◽  
Vol 12 (2) ◽  
pp. 188
Author(s):  
Supono Supono ◽  
Graeme Knowles ◽  
Christopher Bolch
Keyword(s):  
Crassostrea Gigas ◽  
Mytilus Galloprovincialis ◽  
Pacific Oyster ◽  
Blue Mussel ◽  
Larval Mortality ◽  
Larval Rearing ◽  
Toxic Dinoflagellate ◽  
Alexandrium Catenella ◽  
Paralytic Shellfish Toxins ◽  
Paralytic Shellfish

HighlightToxicity and pathological effects of A. catenella were investigated on shellfish larvaeUnfiltered exudates of A. catenella caused significant mortality of blue mussel larvaeApplication of 0.22 mm filtration on A. fundyense exudates potentially decrease the toxicity effectsPathological effects of A. catenella occurred as early as 3 h after exposureThe prevalence and intensity of necrosis increased with exposure duration to A. catenella exudatesAbstractBlooms of the toxic dinoflagellate Alexandrium catenella have affected shellfish industries globally due to their capacity to produce paralytic shellfish toxins(PST). This study aimed to investigate the toxicity effect of exudate A. catenella on larvae of blue mussel Mytilus galloprovincialis and Pacific oyster Crassostrea gigas and filtration methods to reduce the toxic effect. Blue mussel and Pacific oyster larvae were assessed their survival and histopathological changes after exposure to extracellular exudates of A. catenella ranging from 100 to 1,000 cells ml-1 . The results showed that exposure to exudate A. catenella caused significantly higher larval mortality (39 to 52%) than exposure to an equivalent biovolume of the nontoxic species, Tisochrysis lutea (33%) or unfed controls (17%). Filter-sterilization (0.22 µm) of exudates and activated carbon filtration decreased the mortality of Pacific oyster larvae to a level similar to controls (unfed), with the exception of the highest concentrations (600 and 1,000 cells ml-1 ) and mortality of bluemussel larvae mortality by 32% respectively. Blue mussel larvae exposed to exudate A. catenella showed pathological changes mainly in the stomach (digestive gland and style sac) as early as three hours after onset of exposure. The findings of this study suggest that early detection of blooms in the vicinity of mussel and Pacific oyster hatcheries and taking steps to mitigate their effects, is important to reduce the effects of A. catenella blooms on shellfish larval rearing.

Sign in / Sign up

Export Citation Format

Share Document