scholarly journals First report of an idiopathic partial tail myonecrosis in European brown shrimp Crangon crangon caught in the North Sea

2020 ◽  
Vol 138 ◽  
pp. 35-40
Author(s):  
XHC Vermeersch ◽  
A Decostere ◽  
G Vlaemynck ◽  
K Chiers
Keyword(s):  
North Sea ◽  
Distal Part ◽  
Brown Shrimp ◽  
Bacterial Invasion ◽  
Microscopical Examination ◽  
Necrotic Tissue ◽  
Crangon Crangon ◽  
Important Species ◽  
The North ◽  
The North Sea

The European brown shrimp Crangon crangon is an abundant and commercially important species in the North Sea. Currently, there is interest in landing live shrimp to provide fresh animals for a growing market in live brown shrimp. During 4 survival studies between 2014 and 2016, shrimp were collected from commercial trawlers and maintained alive in off-shore facilities. From Day 1 onwards, a minority of shrimp (~2.24%) developed a white discoloration of the abdominal muscles and a depigmentation of the distal part of the abdomen, along with paralysis of the affected tissues and appendages. As the symptoms progressed, a circumferential blackish delineation appeared, creating a distinct boundary between healthy and necrotic tissue. Affected shrimp survived up to 3 wk, although in several animals the distal part of the tail was completely lost. Histological and electron microscopical examination confirmed the myonecrosis. A secondary bacterial invasion of the necrotic muscle was observed in some animals. RT-PCR for infectious myonecrosis virus was negative. The condition appears not to be contagious, based on the feeding of healthy shrimp with necrotic tissue of affected shrimp. Based on these observations, a mechanical cause inflicted during the catching process is proposed.

scholarly journals Predictive framework for codend size selection of brown shrimp (Crangon crangon) in the North Sea beam-trawl fishery

PLoS ONE ◽  
2018 ◽  
Vol 13 (7) ◽  
pp. e0200464 ◽  
Author(s):  
Juan Santos ◽  
Bent Herrmann ◽  
Daniel Stepputtis ◽  
Claudia Günther ◽  
Bente Limmer ◽  
...  
Keyword(s):  
North Sea ◽  
Brown Shrimp ◽  
Beam Trawl ◽  
Crangon Crangon ◽  
Size Selection ◽  
Trawl Fishery ◽  
The North ◽  
Sea Beam ◽  
The North Sea ◽  
Selection Of

scholarly journals Tail Myonecrosis IN Brown Shrimp (Crangon crangon L.) Caught in the North Sea

2016 ◽  
Vol 154 (1) ◽  
pp. 93
Author(s):  
X. Vermeersch ◽  
A. Decostere ◽  
G. Vlaemynck ◽  
K. Chiers
Keyword(s):  
North Sea ◽  
Brown Shrimp ◽  
Crangon Crangon ◽  
The North ◽  
The North Sea

scholarly journals Hydrostatic pressure affects selective tidal stream transport in the North Sea brown shrimp (Crangon crangon)

2015 ◽  
Vol 218 (20) ◽  
pp. 3241-3248 ◽  
Author(s):  
M. Tielmann ◽  
S. Reiser ◽  
M. Hufnagl ◽  
J.-P. Herrmann ◽  
A. Eckardt ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
North Sea ◽  
Brown Shrimp ◽  
Crangon Crangon ◽  
The North ◽  
The North Sea ◽  
Tidal Stream ◽  
Selective Tidal Stream Transport ◽  
Stream Transport

scholarly journals The Algicidal Bacterium Kordia algicida Shapes a Natural Plankton Community

2019 ◽  
Vol 85 (7) ◽  
Author(s):  
Arite Bigalke ◽  
Nils Meyer ◽  
Lydia Alkistis Papanikolopoulou ◽  
Karen Helen Wiltshire ◽  
Georg Pohnert
Keyword(s):  
North Sea ◽  
Algal Blooms ◽  
Plankton Community ◽  
Algicidal Bacteria ◽  
Important Species ◽  
Substantial Impact ◽  
The North ◽  
Algicidal Bacterium ◽  
The North Sea ◽  
Plankton Communities

ABSTRACT Plankton communities consist of complex microbial consortia that change over time. These fluctuations can be only partially explained by limiting resources. Biotic factors such as herbivores and pathogens also contribute to the control of algal blooms. Here we address the effects of algicidal bacteria on a natural plankton community in an indoor enclosure experiment. The algicidal bacteria, introduced into plankton taken directly from the North Sea during a diatom bloom, caused the rapid decline of the bloom-forming Chaetoceros socialis within only 1 day. The haptophyte Phaeocystis, in contrast, is resistant to the lytic bacteria and could benefit from the removal of the competitor, as indicated by an onset of a bloom in the treated enclosures. This cascading effect caused by the bacterial pathogen accelerated the succession of Phaeocystis, which bloomed with a delay of only several weeks in the in situ waters at Helgoland Roads in the North Sea. The algicidal bacteria can thus modulate the community within the limits of the abiotic and biotic conditions of the local environment. Implications of our findings for plankton ecosystem functioning are discussed. IMPORTANCE Plankton communities change on a seasonal basis in temperate systems, with distinct succession patterns; this is mainly due to algal species that have their optimal timing relative to environmental conditions. We know that bacterial populations are also instrumental in the decay and termination of phytoplankton blooms. Here, we describe algicidal bacteria as modulators of this important species succession. Upon treatment of a natural plankton consortium with an algicidal bacterium, we observed a strong shift in the phytoplankton community structure, compared to controls, resulting in formation of a succeeding Phaeocystis bloom. Blooms of this alga have a substantial impact on global biogeochemical and ecological cycles, as they are responsible for a substantial proportion of primary production during spring in the North Sea. We propose that one of the key factors influencing such community shifts may be algicidal bacteria.

scholarly journals Shell disease does not affect biochemical profiles of the North Sea brown shrimp Crangon crangon

2020 ◽  
Vol 141 ◽  
pp. 117-126
Author(s):  
A Segelken-Voigt ◽  
W Hagen ◽  
G Gerlach ◽  
J Strahl
Keyword(s):  
Nutritional Value ◽  
Essential Fatty Acids ◽  
Brown Shrimp ◽  
Hepatosomatic Index ◽  
Crangon Crangon ◽  
The North ◽  
The North Sea ◽  
Shell Disease ◽  
Biochemical Profiles ◽  
Atlantic Coastal

The brown shrimp Crangon crangon is a key component of the North Atlantic coastal food web and an important target species for the fishery economy. As the brown shrimp contains large amounts of protein and essential fatty acids, its consumption makes it a beneficial choice for humans. Commercially harvested crustaceans like C. crangon are frequently affected by bacterial shell disease, with necrotizing erosions and ulcerations of the cuticle. To determine whether shell disease influences the nutritional value of C. crangon, total protein and lipid contents, as well as fatty acid compositions of muscle tissue and hepatopancreas, together with the hepatosomatic index, were examined in healthy and affected individuals. The biochemical composition of the tissues did not differ significantly between the 2 groups. Also, the hepatosomatic index, as an indicator of energy reserves in shrimps, was similar between healthy and affected animals. Our results indicate that the nutritional value of C. crangon is not affected by shell disease, as long as it remains superficial as in the present study.

scholarly journals Recent findings of wild European flat oysters Ostrea edulis (Linnaeus, 1758) in Belgian and Dutch offshore waters: new perspectives for offshore oyster reef restoration in the southern North Sea

2018 ◽  
Vol 148 (1) ◽  
Author(s):  
Francis Kerckhof ◽  
Joop W.P. Coolen ◽  
Bob Rumes ◽  
Steven Degraer
Keyword(s):  
North Sea ◽  
Ostrea Edulis ◽  
Important Species ◽  
Reef Restoration ◽  
The North ◽  
Detection And Identification ◽  
The North Sea ◽  
Feasible Alternative ◽  
Flat Oyster ◽  
The 19Th Century

The European flat oyster, Ostrea edulis, is an emblematic and ecologically important species that was fished to virtual extinction in Belgian and Dutch waters in the 19th century. We report on recent findings of live specimens in Belgian and Dutch waters, an indication for the presence of O. edulis in these waters. Though small, these relict populations provide possibilities for natural recovery of O. edulis reefs in Belgian and Dutch waters, provided the oyster’s habitat requirements are restored (e.g., exclusion of bottom disturbance). We suggest investigating whether a natural, yet slow, recovery using fisheries closures and gravel bed restoration is a feasible alternative to the currently envisaged human-mediated re-introduction of O. edulis in the North Sea. We identify and address the challenge of O. edulis detection and identification as an important issue blurring the true presence and distribution of oysters.

Short-term effect of pulsed direct current on various species of adult fish and its implication in pulse trawling for brown shrimp in the North Sea

2016 ◽  
Vol 179 ◽  
pp. 90-97 ◽  
Author(s):  
Marieke Desender ◽  
Koen Chiers ◽  
Hans Polet ◽  
Bart Verschueren ◽  
Jimmy H. Saunders ◽  
...  
Keyword(s):  
North Sea ◽  
Direct Current ◽  
Term Effect ◽  
Brown Shrimp ◽  
Adult Fish ◽  
Short Term ◽  
Short Term Effect ◽  
The North ◽  
The North Sea ◽  
Pulsed Direct Current
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