This research is commissioned by the professorship Novel Proteins: Insects and Fish, Healthy, Sustainable and Safe (INVIS) and conducted with the aim to investigate the constraints that hinder the uptake of insect-based feed in the Dutch finfish aquaculture branch and advise upon how to initiate a transition within the branch to adopt insect meal in fish feed widely. This is a underlying report of the webinar Insect culture in the Netherlands for feed and food on January 19, 2021.
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Flyer with information about the lectureship INVIS, HAS Hogeschool. Extend and integrate knowledge, experience, and education on healthy and safe insect and fish culture: Investigate risk factors and support the use of healthy and safe insects in aquaculture feed in cooperation with feed processors.
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Recording of the webinar "Insect culture in the Netherlands for feed and food with special focus on bacterial health" from Dr. Olga Haenen (Dutch National Reference Laboratory for Fish, Shellfish and Crustacean Diseases) presenting as part of the Centre for Sustainable Tropical Fisheries and Aquaculture (CSTFA) Webinar Series.
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Vietnamese farmed pangasius products have experienced major price fluctuations over numerous crop cycles exposing this important export commodity to risk and uncertainty. This study focuses on two distinct areas of risk. First, this study seeks to measures the farm-gate price volatility, explores farmers’ perceptions about the price volatility risk related to the input sourcing and output selling activities, and quantifies the effectiveness of price volatility risk management strategies. Second, the relationships between farm and farmer socioeconomic characteristics, perceptions about the price volatility risk and management strategies are also examined. To respond to these research questions, a focus group workshop was conducted with 29 stakeholders and a structured survey with 92 farmers located in the provinces of An Giang, Can Tho, and Dong Thap of the Vietnamese Mekong Delta. Results illustrated that the pangasius farm-gate price fluctuates significantly over time. Vietnamese pangasius farmers are mainly concerned about the volatilities of input and output prices, additionally with the instability of the volume input supply, instability in demand volume, and weak legislation on sale contracts. Results further indicate that price volatility risk management strategies are less effective in practically protecting farmers against price volatility risks. Farmers with higher education knowledge opt for fully integrated farms and are less concerned about the output price volatility risk. Promoting risk-sharing schemes such as contract farms or insurance for farmers with higher educational levels and being accessible to credit could support Vietnamese pangasius farmers toward increasing the sustainability of pangasius production.
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Lake Kivu is experiencing unprecedented decline in production of Tanganyika Sardine (Limnothrissa miodon). This study sought to characterise the value chain of this fish species so as to chart its sustainable utilisation. The study performed in 2015 found two chains; an informal chain that takes 30% of the production and a formal chain that handles 70%. The average catch of sardine was 30 kg/day in the high production season and <15 kg/day in the low season. Two thirds of the fishers were not aware of the governing law. Fishing malpractices included fishing in prohibited sites, beach seining and fishing during moratorium period. Majority of fishers were not satisfied with the price offered in the market as costs involved in fishing was 701 Rwanda Francs/kg caught. This is despite the shift in time since the study was performed. Therefore, there is need for re-training of value chain actors, increasinglake surveillance, strengthening internal controls of the Fishers’ Cooperatives and improving information sharing and communication among value chain actors.
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Bij elke levenscyclusanalyse komt het voer naar voren als de meestmilieubelastende component van de aquacultuursector. Een van de oorzaken daarvan is het gebruik van eiwitbronnen. Plantaardige ingrediënten vragen land, water en energie, en de vangst van vis voor vismeel en visolie is energieintensief en draagt bij aan de verstoring van de biodiversiteit in zee. In een NWO-KIEM project vanuit het lectoraat INVIS inventariseerden onderzoekers, samen met studenten van de HAS Hogeschool, de kansen en uitdagingen van het gebruik van meel van insecten die groeien op afval. De kennis die is opgedaan tijdens het eenjarige project is gedeeld met geïnteresseerden tijdens een webinar.
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Seaweeds from the genus Porphyra play a big economic role in seaweed aquaculture, mainly in Asia. In Europe, resources are put towards seaweed cultivation, but without attention to the Porphyra species which is also native to Europe. Different nomenclature and specifications are used to describe Porphyra, due to taxonomical reclassification and difficult phenotypical identification. Abiotic & biotic together with seasonal factors make for major variance in chemical compositions that are reported. This is also fueled by differences in chemical analytical methods and procedures followed. Combining taxonomical challenges, variance due to seasonal factors and differences in analysis, overviewing published research on Porphyra constituents such as protein, polysaccharides and fatty acids is warranted. Within this review, cellular consitutents found in Porphyra are discussed, including proteins, polysaccharides, fatty acids and mycosporine-like amino acids (MAA’s). MAA's are considered amongst the strongest UV-photoprotectants found in nature and feature possible applications in cosmetics. As global interest in seaweeds as food, feed and industrial resource is emerging, opportunities for Porphyra constituents is rising.
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Aquaponics is a recirculating aquaculture system (RAS) which combines the cultivation of fish with the growing of plants. Similar to vertical farming, aquaponics is one of the new forms of space and resource efficient methods of food production. The mechanical and electronic technology essential to a sustainable management of the living system(s) is still at an early stage of development. Systemic imbalance frequently occurs in current practice and leads to costly and time consuming problems that threaten the commercial viability of aquaponics at all scales of application. The smart marine aquaponics (SMA) project endeavoured to explore opportunities in two key areas of RAS development. Firstly by focusing upon what could be the most resource efficient type of RAS, namely one using marine conditions and life forms. Secondly by addressing what is commonly accepted as one of the greatest obstacles to prolonged system stability and efficiency, the process known as fecal waste mineralization. The transformation of fecal waste excreted by aquatic fauna into the nutrients for aquatic plants can be assisted or hampered by water conditions and in turn, accumulating in its untransformed state, can reduce the ability of the water to support flora and fauna. SMA applied sensors to actual and simulated forms of marine based RAS to measure and optimize the effects of mechanical intervention in the process of mineralization.
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Hieronder vindt u de presentaties van het webinar Insect culture in the Netherlands for feed and food op 19 januari 2021.
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