Towards Sustainable jellyfisheries in European waters with special emphasis on the Trondheimsfjord as a case area

Autor: Aberle N(1), Andrade C(2, 3, Angel DL(5), Canning-Clode J(6, Dierking J(8), Dror H(5), Edelist D(5), Ellingsen I(9), Gueroun SKM(3, 4, Klun K(10), Leone A(11), Majaneva S(1), Rotter A(10), Tiller R(9), Javidpour J(12)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Aquaculture Europe 2021 (EA21), Funchal, Madeira, Portugal, 03-07/10/2021
info:cnr-pdr/source/autori:Aberle N(1), Andrade C(2,3,4), Angel DL(5), Canning-Clode J(6,7), Dierking J(8), Dror H(5), Edelist D(5), Ellingsen I(9), Gueroun SKM(3,4,6), Klun K(10), Leone A(11), Majaneva S(1), Rotter A(10), Tiller R(9), Javidpour J(12)/congresso_nome:Aquaculture Europe 2021 (EA21)/congresso_luogo:Funchal, Madeira, Portugal/congresso_data:03-07%2F10%2F2021/anno:2021/pagina_da:/pagina_a:/intervallo_pagine
Popis: Jellyfish are an important component of pelagic ecosystems that can form massive blooms over large spatial and temporal scales. Intensity, frequency, and duration of jellyfish blooms vary, show strong species- and site-specific differences and are often considered as nuisance for local industries, tourism and artisanal fishery. Demands for jellyfish-related products in e.g. the aquaculture feed, foods, cosmetics or pharmaceutical sector are increasing becoming concrete specially for food uses of some species, thus providing an opportunity to turn this nuisance into a resource. However, a sound management of jellyfish resources is missing thus hampering a sustainable, cost-efficient harvesting of jellyfish biomass. Within the framework of the EU-project GoJelly, the aim was to provide a basis for ecosystem-based management approaches taking the knowledge gaps related to jellyfish ecology, bloom dynamics, and origin of seed populations into account. By focusing on the biotic and abiotic drivers that promote jellyfish bloom formation, more reliable predictions on jellyfish blooms and tools for sustainable harvesting should be achieved. From 2018-2020, target jellyfish species with broad spatiotemporal distribution ranges in European waters were harvested (Aurelia spp., Periphylla periphylla, Cyanea capillata, Rhopilema nomadica, Rhizostoma pulmo, Cotylorhiza tuberculata, Catostylus tagi, Mnemiopsis leidyi) in several GoJelly case areas (Norwegian Sea, Baltic Sea, Mediterranean Sea and Eastern Atlantic). Different types of fishing vessels were used ranging from small-sized open boats to medium-sized research vessels. Jellyfish were harvested using six gear types (gillnets, bottom trawls, pelagic trawls, landing nets, hand nets, 20-L buckets). The mesh size varied from 0.35 to 50 mm. The gear type reflected the harvesting depth as well as the vessel type. In total approx. 3 tons of jellyfish were harvested by GoJelly partners whereof 60% of the total biomass was harvested in the Trondheimsfjord case area, Norway. The harvested biomass showed interannual variation related to differences in harvesting efforts and bloom intensities of the target species (Figure 2A). Nine jellyfish species were harvested (Figure 2B), three on them representing 80% of the total catch (44% Periphylla periphylla: harvested in Trondheimsfjord; 18% Rhizostoma pulmo: harvested in the Mediterranean Sea (Gulf of Trieste and Ionian Sea); 17% Aurelia spp.: harvested in Trondheimsfjord, Baltic Sea and Gulf of Trieste (Mediterranean). Management of jellyfish resources in Europe is currently missing thus hampering a sustainable, cost-efficient harvesting of jellyfish biomass. Within the EU-project GoJelly, the aim was to provide a basis for ecosystem-based management approaches taking the knowledge gaps related to jellyfish ecology, bloom dynamics, and origin of seed populations into account. The aim was to analyse biotic and abiotic drivers that promote jellyfish bloom formation in the Trondheimsfjord case area to enable more reliable predictions on jellyfish blooms and tools for sustainable harvesting. Here, we address the knowledge gaps related to jellyfisheries and demonstrate future needs towards an ecosystem-based management of local jellyfish resources.
Databáze: OpenAIRE
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