Mass occurrence of the physonect siphonophoreApolemia uvaria(Lesueur) in Norwegian waters

To Adapt or Not Adapt: Assessing the Adaptive Capacity of Artisanal Fishers in the Trondheimsfjord (Norway) to Jellyfish (Periphylla periphylla) Bloom and Purse Seiners

“…The most important direct negative consequences of jellyfish blooms are economic losses, which include reduced tourism in affected areas due to stinging danger. It can also reduce fish catches of artisanal and commercial fishers due to damage to net gear, stinging danger and the resultant longer working hours required to clean and fix fishing nets (Quiñones et al 2013), fish mortality due to stinging, oxygen deprivation in the aquaculture industry, and blocking of water inlets of power plants (Hay et al 1990;Ba mstedt et al 1998;Hay 2006;Purcell 2007). These negative consequences can lead to large economic losses through reduced profits and increasing costs, especially for fisheries (Graham et al 2003;Quiñones et al 2013), as well as to the whole fishing industry at a sector level (Kim et al 2012;Nastav et al 2013).…”

“…Aquaculture has had heavy losses due to jellyfish such as Apolemia uvaria and lion's mane Cyanea capillata clogging the fish cages and stinging the gills of the fish, causing suffocation and mortality (Ba mstedt et al 1998). The traditional fisheries experience, however, has centered around high densities of jellyfish, specifically the helmet jellyfish Periphylla periphylla, which has been clogging their nets, stinging fishers, and preyed on both the larval stages of cod and Atlantic Herring Clupea harengus as well as the food of these fish, the redfeed, thereby reducing the catches for the artisanal fishers in the area dramatically over the years.…”

Fauna of the Mediterranean Hydrozoa.

“…Cited in the Mediterranean, in the vicinity of Naples, Messina, Monaco, and Villefranche-surMer (Alvariño, 1971). In the Atlantic Ocean cited off the British Isles and Norwegian fjords (Båmstedt et al, 1998).…”

“…References : Totton (1965);Carré (1973, 1995), Alvariño (1971); Kirkpatrick and Pugh (1984); ; Båmstedt et al (1998).…”

Occurrence of the physonect siphonophore Apolemia uvaria off Plymouth and in south-west England

“…The occurrence of Apolemia uvaria as far north as Norway (Båmstedt et al, 1998) and, at least from the 1960s in the northern North Sea, makes it unlikely that seawater warming is a reason for its recent presence off Plymouth. It seems more probable that some variation in ocean currents or upwelling of deeper waters has caused more specimens to be brought into British waters, as suggested by Båmstedt et al (1998) for the Norwegian increase.…”