Jellyfish summer distribution, diversity and impact on fish farms in a Nordic fjord

Halsband, Claudia; Majaneva, Sanna; Hosia, Aino; Emaus, Per; Gaardsted, Frank; Zhou, Qin; Nøst, Ole Anders; Renaud, Paul E.

doi:10.3354/meps12274

Cited by 20 publications

(11 citation statements)

References 34 publications

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“…having interfered with aquaculture in the sense of having adverse effects or lead to increased mortality on farmed fish, other siphonophores including Apolemia uvaria (Båmstedt et al, 1998) and Muggiaea atlantica have been implicated in killing farmed fish (Fosså et al, 2003) and causing considerable economic losses, together with a number of other cnidarians and even ctenophores (cf. Lucas et al, 2014;Halsband et al, 2017). Aquaculture activity, e.g.…”

Section: Potential Consequencesmentioning

confidence: 99%

Coincident Mass Occurrence of Gelatinous Zooplankton in Northern Norway

et al. 2018

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In autumn 2015, several sources reported observations of large amounts of gelatinous material in a large north Norwegian fjord system, either caught when trawling for other organisms or fouling fishing gear. The responsible organism was identified as a physonect siphonophore, Nanomia cara, while a ctenophore, Beroe cucumis, and a hydromedusa, Modeeria rotunda, were also registered in high abundances on a couple of occasions. To document the phenomena, we have compiled a variety of data from concurrent fisheries surveys and local fishermen, including physical samples, trawl catch, and acoustic data, photo and video evidence, and environmental data. Because of the gas-filled pneumatophore, characteristic for these types of siphonophores, acoustics provided detailed and unique insight to the horizontal and vertical distribution and potential abundances (∼0.2-20 colonies•m −3) of N. cara with the highest concentrations observed in the near bottom region at ∼320 m depth in the study area. This suggests that these animals were retained and accumulated in the deep basins of the fjord system possibly blooming here because of favorable environmental conditions and potentially higher prey availability compared to the shallower shelf areas to the north. Few cues as to the origin and onset of the bloom were found, but it may have originated from locally resident siphonophores. The characteristics of the deep-water masses in the fjord basins were different compared to the deep water outside the fjord system, suggesting no recent deep-water import to the fjords. However, water-masses containing siphonophores (not necessarily very abundant), may have been additionally introduced to the fjords at intermediate depths, with the animals subsequently trapped in the deeper fjord basins. The simultaneous observations of abundant siphonophores, hydromedusae, and ctenophores in the Lyngen-Kvaenangen fjord system are intriguing, but difficult to provide a unified explanation for, as the organisms differ in their biology and ecology. Nanomia and Beroe spp. are holopelagic, while M. rotunda has a benthic hydroid stage. The species also have different trophic ecologies and dietary preferences. Only by combining information from acoustics, trawling, genetics, and local fishermen, were the identity, abundance, and the vertical and horizontal distribution of the physonect siphonophore, N. cara, established.

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Section: Potential Consequencesmentioning

confidence: 99%

Coincident Mass Occurrence of Gelatinous Zooplankton in Northern Norway

et al. 2018

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“…18 SM-2017 (MF662619) and two specimens with Ctenophora sp. 15 SM-2017 (MF662620) an unidentified cydippid larvae collected from Northern Norway (Halsband et al, 2018). These specimens also formed their own branch in the phylogenetic analysis (Figure 3).…”

Section: Molecular Species Identificationmentioning

confidence: 95%

“…18 SM-2017 and Ctenophora sp. 15 SM-2017 (Halsband et al, 2018), an unidentified cydippid larva collected from Northern Norway. Cydippid larva is an early developmental stage, found in most ctenophores belonging to the orders Lobata and Cydippida (Podar et al, 2001).…”

Section: Ctenophore Species Identificationmentioning

confidence: 99%

Assessing the Value of a Citizen Science Approach for Ctenophore Identification

et al. 2021

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During the era of biodiversity loss, a complete species census and understanding where the different species occur is of high priority. Even though this knowledge has increased tremendously, mainly with expanded use of integrated taxonomic identification, there are groups where our knowledge is very limited, both in terms of diversity and distribution. Ctenophores are such a group. Due to a lack of identification literature, damage to specimens during net sampling and sample processing, difficulties with preservation and a considerably undescribed diversity within the phylum, this group is often hard to work with. A citizen science approach was applied during a mapping campaign on ctenophore diversity along the Norwegian coast in order to have a broad geographical coverage. This was achieved by a collaboration with five diving clubs along a south-north geographical gradient that were briefly introduced to ctenophore taxonomy and ecology and sampling techniques using Whatman® FTA® Cards. The data collected by the participating divers gave a broad spatial coverage and provided information on ctenophore diversity in these regions. The use of FTA® Cards in the sampling allowed successful species and genus level identification using DNA barcodes. However, small obstacles such as accurate morphological species identification and labor-intensive issues were identified that can impede the use of large-scale citizen science approaches to map ctenophore diversity and thus recommendations for future implications that address these issues are proposed here.

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“…Jellyfish blooms vary from weekly changes to decadal cycles (Lucas et al, 2012;Hosia et al, 2014;Licandro et al, 2015). The frequency and intensity of blooms can restructure pelagic food-webs, clog electrical power plant passages, and impact fisheries, aquaculture and tourism (Doney et al, 2012;Doyle et al, 2014;Graham et al, 2014;Dong, 2018;Halsband et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Occurrence and Habitat Characteristics of Aurelia sp. Polyps in a High-Latitude Fjord

et al. 2021

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Causes and consequences of jellyfish bloom formation are subject to controversial discussions worldwide. While medusae have been studied to a broader extent, the knowledge on polyp stages of scyphozoans is limited thus hampering reliable prediction of jellyfish bloom formation. This study describes the occurrence, abundance, habitat characteristics and interactions of scyphozoan Aurelia sp. polyp colonies with other fouling organisms in intertidal and subtidal sectors of Trondheimsfjorden (Norway). In total, 982 polyps were found on 70 substrata of varying material types during a field survey in spring-summer 2018 along a longitudinal gradient within and outside Trondheimsfjorden. The polyps were identified as Aurelia sp. based on molecular species identification. Most polyps were found in bays with macroalgae canopy on the down facing side of artificial and natural substrata (rocks, concrete, iron) and inside rock cracks. Polyp microhabitats included the surface of Ascidia mentula (solitary ascidian), increments of Pomatoceros triqueter (polychete) tubes and dead Balanus balanoides (barnacle) shells. Based on the deployment of settling plates, abundance of Aurelia sp. polyps ranged from 1.2 (± 0.7) to 0.12 (± 0.07) polyps cm–2. Settlement occurred either directly on the PVC settling plates or as epibionts on the ascidian Ascidia mentula and on barnacle shells of Balanus balanoides. This study provides insights into the potential of local Aurelia sp. polyps contributing to the seasonal occurrence and abundance of Aurelia sp. in fjord systems, where intensive blooms occur annually.

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Jellyfish summer distribution, diversity and impact on fish farms in a Nordic fjord

Cited by 20 publications

References 34 publications

Coincident Mass Occurrence of Gelatinous Zooplankton in Northern Norway

Coincident Mass Occurrence of Gelatinous Zooplankton in Northern Norway

Assessing the Value of a Citizen Science Approach for Ctenophore Identification

Occurrence and Habitat Characteristics of Aurelia sp. Polyps in a High-Latitude Fjord

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