By the way, how much is the fish?*

By Cornelia Kreiss:

To produce a good seafood product according to ecological, welfare and human health aspects we also have to consider the economic side of the coin. The use of sustainable alternative feed, close monitoring of the production conditions or the valorisation of side-stream products is beneficial for a more sustainable production, but will also come at a cost. How high is this cost? Which production benefit or who (the consumer?) will compensate for these costs? What about the whole sector impact?

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These are very important questions for farmers and the seafood industry in general, which we seek to answer within GAIN. In order to do this on farm-scale we use a so-called “typical farm approach” implemented by the agri benchmark network headed by the Thünen Institute in Germany. This is a micro-economic tool which allows to portray the typical production of a farmed species according to real costs, techniques and other inputs: all of it in great detail. In the end we can estimate, which market returns per kg fish should be achieved in order to stay (as) profitable (as before)!

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Sustainable production methods themselves already benefit the farmer, resulting in better quality fish that needs less feed to grow to the same size, or achieving higher water quality which might also allow for higher stocking densities. However, such benefits do not always outweigh the full costs that adaptations towards sustainable production might involve. As long as follow-up costs of environmental impacts are not part of the market price (which is admittedly not an easy task to determine!), price differences are at the expense of sustainable products and need a transparent justification.

Originating from Germany, where public awareness and willingness to pay for more sustainable seafood products is higher than in other countries, I am convinced that a good market transparency is the way forward and I am excited to be part of this aim in combination with more sustainable seafood production within GAIN.

*The fish bought by the electro trashers band “Scooter” in the 1990’s and being the name giver for their song “How much is the fish”, cost 3.80 Deutsche Mark and supposedly lived for at least 18 years, which seems to be a quite good deal!

Beer from oysters

By: Joshua Kyle

Walled City Brewery is an independent brewery in Londonderry which prides itself in providing patrons with a ’taste of the North West‘ by crafting local, authentic, premium quality, flavoursome beer and food. Inspired by Guinness’ suggested serving of oysters with stout, the challenge was laid down to the brewers to develop a beer using local Lough Foyle oysters and so Foyster Stout was born.

As with all great challenges, research was needed before jumping into the beer-making by looking to other breweries such as Maine’s ’Out-To-Sea‘ imperial stout in the USA or Dublin’s own Porterhouse’s beer, ’Oyster Stout‘.

A sustainably sourced supply of oysters was required for the beer and that’s why we selected the Lough Foyle Irish Flat oyster—the Loughs Agency, operated jointly by Ireland and Northern Ireland, has worked extensively on this species, as have members of the GAIN team. The oysters were sourced from licensed farmers—it is vital for us and for our customers that we use the best ingredients from sustainable suppliers.

The use of the oyster had a dual purpose in the brewing process. Firstly, the flesh was used in the mashing process which extracts natural sugars—the flesh gives a fantastic marine essence to these sugars. Secondly, the shells contain a high amount of calcium carbonate which is used as clarifying agent of the beer. This ensures every part of the oyster is used and nothing is wasted.

The Walled City Brewery launched the beer on 12th October, 2019 which was widely well received. It will be going on sale as a seasonal beer and Foyster Stout will be available in selected bars and restaurants in the city. We’re grateful to the Loughs Agency for their support in our development of this new beer which will help raise awareness for the Flat Oyster.

The Future of Aquaculture

By: Remigiusz Panicz

The Future of aquaculture’ was the overarching motif of the international conference held in Kudowa Zdrój, Poland between 25 and 27 September of 2019. Fish farmers, scientists and other stakeholders had a unique opportunity to participate in the science-grounded lectures and follow-up discussions both devoted to the aspects and problems of the aquaculture sector

Among these current and future concerns, are animal welfare, the diversification of aquaculture, certification models, climate change and diseases risk. GAIN’s partners Remigiusz Panicz, Jacek Sadowski and Piotr Eljasik, from ZUT introduced participants of the conference to the GAIN project, its objectives and provided its vision on common carp eco-intensification.

 

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This species, whose culture has a long tradition in Poland, currently struggles due to numerous factors: water scarcity, unfavorable policy, and market uptake. The freshwater farmed fish sector seeks for viable solutions to keep carp farming on a profitable level.

During the conference an interesting voice was raised regarding precision aquaculture: a direction which is unavoidable in order to cope with the aforementioned factors. Aspects of macroalgae culture in Polish coastline waters was also presented and discussed: this interesting idea is developing into a new project being launched in Poland this year.

Numerous aspects of circular economy in the Polish aquaculture sector were also raised and discussed openly: energy efficiency, regulations, and management of by-products and waste streams, and pertinent questions related to carp meat supply throughout the whole year.

The eco-intensification and precision aquaculture work developed in GAIN, coordinated with the efforts of stakeholders, might bring solutions for the future of carp farming in Poland.

The day of a fish

By Caitlin Stockwell:

Have you ever wondered what the day of a fish looks like? Or what leads to their decision making? Well I have always been curious, and I turned that curiosity into a career path.

I am a PhD student at Dalhousie University studying fish behavior in aquaculture using acoustics. Now what does that actually mean? There are many ways to study fish behavior from putting tags into a fish and tracking an individual’s movement, to using sound to track an entire populations movement. I use both in my research to help understand different aspects of where fish swim and why.

 

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To make a complicated technology simple, I use acoustics (sounds in the water) to send a sound signal up into the cage and, depending what type of sound is returned, will determine the amount of fish and their location in the cage. This information can be extremely useful to fish farmers as it can help them determine when to start and stop feeding, as well as how their fish respond to other environmental conditions (such as storms or harmful algae blooms).

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The aim of studying fish movement is to help farmers better understand their fish and assist them in mitigating any stress that could impact the fish’s well-being. By providing this information, we can help make happier, healthier fish to help feed our growing population.

GoodFish

By: André Lopes

As consumers what do we look for in our food? Something tasty, that we like, want and are able to find in our towns and cities. We look for healthy options, at least as far as we are able or willing to go. Fish – or shellfish – either farmed or wild mostly fits such criteria, especially when compared to other available animal protein sources.

We also want safe seafood, which is nowadays commonly available at most supermarkets, fish markets and even online. For most consumers on top of these considerations is the most important factor: cost. A fish that would check all of these boxes at a reasonable price, could be considered to be a GoodFish.

Although these aspects shape our choices, other considerations have entered our plates recently: now we also want our fish to be fed, grown, processed and transported sustainably – in its three-pronged meaning: ecological, social and economic.

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Inside each of these three aspects of sustainability resides a multitude of components which include genuine concerns such as animal welfare, gender equality, environmental protection and waste reduction objectives which fuel the implementation of circular economy principles.

Coupled with these recent requests (and partially originated by them) also stems a demand for higher trust in the food we purchase, hence the growth in innovative technologies who enable companies to increase the traceability and transparency of their supply chains, and empower us, consumers, (ideally) to also bask in the benefits of such tools. Shortly: we want to know more about what we eat so we can shape our consumption knowingly.

On the other side of this “coin” we have: 1. Regulators seeking to create conditions that promote sustainable practices; and 2. The seafood industry, who keeps providing an ever-increasing amount of fish and shellfish to our plates, while providing livelihoods to millions of people.

In order to figure out how to breed higher quantities of fish with less environmental impacts, while not trampling over animal welfare or human rights, could be (in fact is) a tough, reachable and critical task. That is why innovations stemming from science and businesses that can help us reach these goals will play a role. In working together and combining them we can reach that sweet spot: a GoodFish.

VALORIZATION OF AQUACULTURE BY-PRODUCTS: BEYOND OF FISH MEAL PRODUCTION

By: Xosé Antón Vázquez Álvarez

Industrially implemented in northern Europe (mainly Iceland and Scandinavia) a century ago to manage herring fishery wastes, the production of fish meal and fish oils were – and still are – traditional ways of valorizing by-products generated by the fishing industry. Extensible also to the co-products produced in the de-heading, gutting and filleting of the heads, viscera and frames of farmed fish (salmon, trout or sea bass), fish meal plays a fundamental role in the productive system of the aquaculture industry as final receptors (managers) of their wastes, and producers of the aforementioned compounds. The market value of fish meal is a function of its level of protein, and fish oils are more valued the higher the concentration of omega-3 fatty acids, especially docosahexaenoic acid (DHA). Both products are essential ingredients in aquaculture feed formulations.

However, other alternatives and processes of valorization can be applied to these substrates: the production of fish protein hydrolysates (FPHs) and marine peptones generated from all wastes, the recovery of collagen and gelatin from the skins or hydroxyapatites of the fish bones. Within the framework of the GAIN project, the Marine Research Institute (IIM-CSIC, Vigo, Spain) is developing and optimizing these alternatives, initially on a lab scale, and scaling some of them in the pilot plant available in the IIM-CSIC. The raw materials studied are heads, trimmings, frames and viscera from rainbow trout, salmon, turbot and carp.

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In the first case, the production of FPHs consists in the application of proteases, mainly exogenous, to the mixing of the crushed wastes with water working under optimal experimental conditions (pH, T, enzyme concentration, etc.) for the adequate enzymatic hydrolysis of the substrates. The solid hydrolysates generated after the separation of the bones and oils present in the initial substrates and the drying process are a highly digestible protein-rich material, with a varied set of peptides of different sizes, in some cases with certain bioactive properties and better nutritional characteristics than the fish meal used as ingredient in aquaculture feed. It is in this direction where the application of the FPHs produced in the IIM-CSIC will be focused: the preparation by SPAROS of new formulations for aquaculture feed based, among other ingredients, on FPH’s. Additionally, hydrolysates from individuals of blue whiting discarded by European fishing fleets and which must be landed to the ports following the new EU fishing policy (Landing Obligation) will also be evaluated in salmonids feed.

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The second of the examples consists in the production of marine peptones from the FPHs after stages of autoclaving and centrifugation. These fluids rich in protein material should be a source of organic nitrogen of great potential in the formulation of nutritive media for the cultivation of bacteria with important technological applications (probiotics, dairy starters, producers of bacteriocins and lactic acid, etc.). On the other hand, collagen and gelatins that can be recovered from fish skins, combining different chemical, enzymatic and thermal purification/extraction steps, could be biomaterials of interest in pharmacological, nutraceutical and food sectors. Finally, thermally processed clean bones of muscular debris, should have a composition rich in calcium phosphates with possibilities of application as a food supplement, incorporated into fertilizers or as bioapatites for bone regeneration.

We hope that the processes that will be developed within GAIN will lead to other alternatives, economically more profitable, for the management of aquaculture by-products beyond the well-established production of fish meal.

Toward the eco-intensification of Rainbow Trout Farming in Trentino (Northern Italy)

By: Edouard Royer with contributions from Andrea Forchino

I am Edouard, a French engineer working within GAIN for Università Ca’Foscari (UNIVE) in Venice, Italy. In my previous life, I was busy launching satellites. Now I am discovering the fascinating world of aquaculture and finding out that dynamic systems and data assimilation are becoming key tools in managing aquafarms. Within the GAIN project I’m trying to set up a model of a trout farm based on data provided from Troticoltura Leonardi located in Preore (Trentino, Italy).

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Rainbow trout farm in Trentino

Rainbow trout farming is the main fish farming activity in northern Italy, allowed by the presence of many watercourses coming from the Alpes Mountains. The last Italian census of aquaculture (PO FEAMP 2014-2020) counted 310 freshwater farming companies, most of them producing rainbow trout (Oncorhynchus mykiss). These farms are mainly located in Northern Italy, particularly in 3 different regions: Veneto (70 farms), Friuli Venezia Giulia (68) and Trentino Alto Adige (58).

If on the one hand trout farming is a traditional productive activity in Italy, on the other hand the new generation of farmers are looking forward to exploring the application of new technologies and collaboration leading to the optimization of management practices. This is the case of Dr. Matteo Leonardi who together with his company, Troticoltura Leonardi S.r.l., is involved in GAIN as an associated partner. But, how can a traditional productive activity such as trout farming be eco-intensified? This was the question risen by GAIN and now, at the beginning of the second year of the project, everything is ready to answer that question!

Troticoltura Leonardi trout farm in Preore (TN)
Troticoltura Leonardi trout farm in Preore (TN)

On July 16th 2019, with my colleagues Roberto Pastres and Andrea Forchino we met Filippo Faccenda (Fondazione Edmund Mach – FEM) and Mateo Leonardi at Preore in Troticoltura Leonardi aquafarm.

It was first an opportunity to monitor the sensors that were immersed at the beginning of July: water quality sensors provided and managed by FEM, and the daily biomass system. Second, it was the occasion to acquire the first data in order to accomplish an in-situ validation of the acquisition systems. Concerning water quality sensor, it was installed in one of the six raceways of the farm to continuously record data on ammonia, nitrates, redox potential, pH, dissolved oxygen, and temperature. All sensors are working well and the activities of the next weeks will be focused on the periodic transfer from the site to the IBM Castor platform, both from the technical and organizational point of view. These data will be crucial in trying to model the relationship between biomass growth, oxygen rate, temperature and feeding strategy.

Dr Filippo Faccenda (FEM) and Dr. Edouard Royer (UNIVE) download the data recorded by the water quality probe
Dr. Filippo Faccenda (FEM) and Dr. Edouard Royer (UNIVE) download the data recorded by the water quality probe.

But the meeting was also a good way to share again the objectives of the GAIN project related to Troticoltura Leonardi: Matteo Leonardi explained again his farming process and the concerns related to the lack of forecast in the frame of oxygen concentration (and its regulation) and its influence on feeding assimilation. Both inner products (oxygen and feeding) are for the farmer two important costs, as well as two central parameters for the welfare of the rainbow trout.

It was then the opportunity to confirm again the pertinence of the objectives of the GAIN project regarding farmers concerns and the challenges they face everyday in growing trout in raceways with water that continuously fluctuates in quality (due to its origin in natural water courses).

The GAIN work will now consist in modelling the biomass growth, the oxygen concentration variation due to animals behavior, and the evolution of temperature, seeking to build reliable forecasts that can support the farmer in his day-to-day decisions, reducing the costs and increasing welfare of the fishes. In one word, optimizing the process!