Jellyfishing in Europe: Current Status, Knowledge Gaps, and Future Directions towards a Sustainable Practice (original) (raw)
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Jellyfish fisheries in southeast Asia
Jellyfish Blooms: Ecological and Societal Importance, 2001
A few large jellyfish species in the order Rhizostomeae constitute an important food in Chinese cooking. For more than 1700 years, they have been exploited along the coasts of China. Such jellyfish became an important fishery commodity of Southeast Asian countries in the 1970s with increasing demand from the Japanese market. Recently, Japan has imported 5400-10 000 tons of jellyfish products per year, valued at about 25.5 million US dollars, annually from the Philippines, Vietnam, Thailand, Malaysia, Indonesia, Singapore and Myanmar. Judging from the type names at market and the external appearance of the semi-dried products, the edible jellyfish harvest in Southeast Asia is composed of more than 8 species. They are caught by various kinds of fishing gear including setnets, drift-nets, hand-nets, scoop-nets, beach-seines and hooks. The fishery is characterized by large fluctuations of the annual catch and a short fishing season that is restricted from two to four months. The average annual catch of jellyfish between 1988 and l999 in Southeast Asia is estimated to be about 169 000 metric tons in wet weight and the worldwide catch is approximately 321 000 metric tons. Needs for future study on the biology of rhizostome jellyfish are discussed as they relate to understanding population fluctuations.
Jellyfish fisheries in northern Vietnam
Plankton and Benthos Research, 2008
The aim of this study is to describe jellyfish fisheries (JF) in Thanh Hoa, the northern part of Vietnam. Information was accumulated based on an interview with the owner of a private jellyfish processing factory (JPF) and fishermen, sampling animals, and through reports of fishery statistics. The JF season begins in April and finishes in May. Two species, Rhopilema hispidum and Rhopilema esculentum are confirmed as commercially exploited, with the former species being caught in much higher abundance than the latter. Cyanea, Chrysaora, Sanderia, and Aequorea were also by caught but not used for processing. Jellyfish are cut into three parts, the bell, the oral-arms, and the stem (fused part of the oral-arm), which are processed separately using salt and alum at the JPF. The number of Rhopilema jellyfish collected by fishermen is estimated as 800,000-1,200,000 indiv. per fishery season, suggesting that the fishery may have an impact on jellyfish populations in the area. On the other hand, the JF has resulted in substantial economic benefits to fishermen, the JPF and thus the local economy. In a jellyfish-rich year, the income of fisherman can reach 31-75 USD day Ϫ1 or 1,200-3,000 USD during the JF season, which could sustain their living for the rest of the year. However, the JF also put fishermen into a financially unstable condition because they have to rely on jellyfish occurrence, which shows high inter-annual variation, and market price set by brokers who purchase their product. Statistics provided by the Sea Product Processing Company indicates that the export amount of jellyfish tripled from a total of 1,500 tones in 1995 to 4,600 tones in 2005.
Jellyfish swarms in the Southern European Seas (SES: Mediterranean and Black Seas) are a recurrent phenomenon which is attracting a groundswell of scientific and societal interest, with potential repercussions for public health, recreation, tourism, fisheries, aquaculture and marine ecosystem health. But this phenomenon also occurs in other areas of the globe, necessitating a collaborative framework which extends beyond the SES. The goal of this International Workshop is thus to bring together people involved in jellyfish research and in management for two full days, and to open the discussion to a wider community than that simply found within the SES. The Workshop will tackle ecosystem services and potential societal benefits provided by jellyfish and their blooms, and detrimental impacts of jellyfish and their aggregations on PERSEUS study areas and other oceans. The main focus of the Workshop is to review the state of our understanding of jellyfish blooms and their dynamics, and to discuss the development of observational systems that will eventually enable better management of their impacts. Some of the topics that will be addressed in Cadiz are the following: how to strengthen our observational capacities to monitor jellyfish over time? (so as not to rely solely on citizen science for distribution and abundance data over time) how can we make use of recent technological advances for research and monitoring of jellyfish blooms? how to incorporate jellyfish in routine monitoring programmes that are carried out by specialists? (like for example phytoplankton or copepods) what knowledge gaps we still need to bridge in order to be able to advance our conceptual understanding of jellyfish blooms and to enhance predictive abilities? how to quantify the impact of jellyfish blooms within the context of Good Environmental Status achievement?
In recent years, there has been a steady rise, globally in the reports of jellyfish blooms and the damages that they cause. Jellyfish im-pacts on commercial fisheries include the clogging, tearing and collapse of nets, loss of fishing days, physical injury to the fishermen. Indirect impacts on fisheries include the competition of jellyfish with finfish over the same food source and direct predation of jellyfish on fish eggs and larvae. In the present paper we propose a methodology to evaluate both direct and indirect impacts of jellyfish on commercial fishery. We use the methodology to estimate the impacts of jellyfish in the eastern Mediterranean (Levant) on the Israeli fishery sector. Our estimation predicts a long run impact on annual profits of about 7 percent on Trawl Fishing and of 46 percent on Trammel and gill net fishing.
Jellyfish Impacts on Marine Aquaculture and Fisheries
Reviews in Fisheries Science & Aquaculture, 2020
Over the last 50 years there has been an increased frequency and severity of negative impacts affecting marine fishery and aquaculture sectors, which claimed significant economic losses due to the interference of stinging gelatinous organisms with daily operational activities. Nevertheless, original scientific information on jellyfish-related incidents, their consequences, and potential preventative and mitigation countermeasures is limited and scattered across gray literature, governmental technical reports, and communication media. A literature scan searching for records of any interactions between jellyfish and the marine fishery/aquaculture sectors was carried out. Out of 553 papers, 90 contained original information, referring to more than 130 cases worldwide of negative impacts of jellyfish on marine fishery/aquaculture over the last century. Calling attention on too often neglected socioeconomic and ecological impacts of jellyfish blooms, the purpose of this paper is to review and analyze the most up-to-date research on this subject and to provide a global perspective on the importance of jellyfish impacts and their cascading effects on marine fishery and aquaculture sectors.
Reviews in Fish Biology and Fisheries, 2016
Jellyfish (primarily scyphomedusae) fisheries have a long history in Asia, where jellyfish have been caught and processed as food for centuries. More recently, jellyfish fisheries have expanded to the Western Hemisphere, often driven by demand from Asian buyers and collapses of more traditional local fish stocks. Jellyfish fisheries have been attempted in numerous countries in North, Central, and South America, with varying degrees of success. Here, we chronicle the arrival of jellyfish fisheries in the Americas and summarize relevant information on jellyfish fishing, processing, and management. Processing technology for edible jellyfish has not advanced, and presents major concerns for environmental and human health. The development of alternative processing technologies would help to eliminate these concerns and may open up new opportunities for markets and species. We also examine the biodiversity of jellyfish species that are targeted for fisheries in the Americas. Establishment of new jellyfish fisheries appears possible, but requires a specific combination of factors including high Hermes Mianzan: Deceased.
Journal of the Indian Society of Coastal Agricultural Research, 2021
The jellyfish-baited trap fishery was studied at four fishing grounds off the eastern coast of Sri Lanka throughout the entire fishing season (February and March) in three consecutive years, from 2017 to 2019, due to its uniqueness of export-oriented small-scale fishery. The composition of catch and their respective stomach content analysis revealed that the highly expensive Malabar groupers, which are predominantly targeted for export markets get attracted to traps as the secondary catch because they predate on the primary catch, e.g., filefishes, rabbitfishes, surgeonfishes and triggerfishes, and the bycatch, i.e., angelfishes and butterflyfishes. The varieties of primary catch are attracted to the jellyfish-bait. Among the 24 species of fishes caught, medusivorous Siganus javus had the highest abundance (24%), followed by Acanthurus mata (21%). Family-wise, the maximum contribution to the total catch was by Siganidae (56%), followed by Acanthuridae (34%). The average CPUE (kg three-man group-1 boat-1 day-1) ± SD of primary, secondary and by-catch during the fishing season was 87.0 ± 18.4 kg (~80%), 15.1 ± 3.4 kg (~14%) and 6.3 ± 1.4 kg (~6%) respectively, while the average total catch per trap was 7.2 ± 1.4 kg. The results of this study are important for utilizing the commonly available jellyfish bait to expand this trap fishery as well as to adapt the strategies for similar fisheries.
EDIBLE JELLYFISH RESOURCE: A MODEL OF COMMUNITY-BASED COASTAL FISHERIES MANAGEMENT
ARTICLE INFO ABSTRACT Fisheries resources management of a single species is planned and approached holistically and sustainably. Similarly, edible jellyfish (scyphozoan) resource management is undergoing a period of blooming every year. Scyphozoan is one of fishery resources that lives in the Indonesia coastal waters and has an important value (economic value). Studies on the edible jellyfish fishery resources management aims to (a) improve the sustainability status and (b) formulate a strategy (management model, operational policies, direction of action). The research activities carried out at Saleh Bay (Sumbawa Island, Indonesia) covering an area of 2,123 km 2 , and the authors visited four times. This research method is a survey method and the method of data collection by sampling method (simple random sampling). Data processed by RAPJELLYFISH method which is a modification of RAPFISH. RAPJELLYFISH analysis results showed that the status of edible jellyfish fishery resources management is "Quite Sustainable" (54.00) and there are 15 sensitive attributes that affect sustainability status. After the intervention of all sensitive attributes, and then re-analyzed by method RAPJELLYFISH, and the status of sustainability increased to "Sustainable" (79.37). Educational Level and Ratio of Quota is the sensitive attributes that most influences of sustainability management status. The most important policy recommendation is the Increase of Management Institution Capacity. Recommended co-management model namely Community-Based Small Scale Coastal Fisheries Management (CBSSCFM) and five operational policies. While the most important recommendation is immediately establishes the independent Authority for managing of Saleh Bay area.