Historical developments and current issues in fish nutrition
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1 Historical developments and current issues in fish nutrition EAAP th of August, Johan Schrama & Sachi Kaushik
2 Content presentation Historical development of aquaculture Trends in fish nutrition/fish feeds EU fish nutrition projects ARRIANA Examples of issues in fish nutrition: Mineral requirements fishmeal replacement Minimizing waste production Do fish drink? Chyme conditions and digestion Enteritis in Salmonids and other fish
3 Content presentation Historical development of aquaculture Trends in fish nutrition/fish feeds EU fish nutrition projects ARRIANA Examples of issues in fish nutrition: Mineral requirements fishmeal replacement Minimizing waste production Do fish drink? Chyme conditions and digestion Enteritis in Salmonids and other fish
4 Historical development of aquaculture Reasons to culture fish: Human food supply: aquaculture Ornamental fish Public aquaria & Zoos 4
5 Historical development of aquaculture Why to eat fish: Source of nutrients: protein, fatty acids, vitamins, minerals Healthy unsaturated fatty acids EPA, DHA & ARA (minimal in farm animals) Nutritional intervention of farmed fish: Protein content & profile No Fat level & fatty acid profile Yes Fishoil Mineral/trace elements/vitamins +/- Contaminants (POPS, heavy metals) Yes
6 Historical development of aquaculture Global fisheries and aquaculture production Source: FAO, The State of World Fisheries and Aquaculture.
7 Historical development of aquaculture What is done with catch/cultured fish? Fishmeal/-oil: 13% total 20% from fisheries Source: FAO, The State of World Fisheries and Aquaculture.
8 Historical development of aquaculture Fishmeal and fish oil production: Raw materials: Whole fish from feed fishing fleets Trimmings & rejects from food fish Total raw material Million tons 5-6 Million tons Million tons Production of: Fishmeal Fish oil 5-6 Million tons < 1 Million tons
9 Historical development of aquaculture Importance of aquaculture over the years. Globally. Source: FAO, The State of World Fisheries and Aquaculture.
10 Historical development of aquaculture Importance of aquaculture in Europe.. 18% from aquaculture: growth small.. Source: FAO, The State of World Fisheries and Aquaculture.
11 Historical development of aquaculture Diversity: aquaculture Intensity Feed/food High variability in aquaculture: Species: Molluscs crustacean fish Type of systems: Ponds raceways cages Indoor (RAS) Type of feeds: Food web formulated complete feed
12 Historical development of aquaculture Diversity: aquaculture
13 Historical development of aquaculture What do we rear? Diversity of species Cyprinids > 60% of volume Majority of fish from low trophic levels No. of species > 300 species reported under aquaculture < 5 species represent 50% of volume produced < 25 species represent 90% of volume produced
14 Historical development of aquaculture European aquaculture dominated by 5 species of finfish (Atlantic salmon, rainbow trout, Seabream, European seabass, Carps) New comers : Asia in tons Tilapia in tons Panga
15 Historical development of aquaculture Diversity: Feeding ecology Carnivore Omnivore Herbivore Generally energy flow in food web: Only 10% of the energy is transferred to the next trophic level (Pauly &Christensen, 2005) Fish species Trophic level Salmon 4.4 Yellowtail kingfish 4.1 Sea bass 3.8 Cod 3.7 Pangasius 3.1 Grass carp 2.0 Nile tilapia 2.0
16 Historical development of aquaculture Diversity: Feeding ecology within species carnivore omnivore herbivore Trophic level of fish: life stage dependent. mouth size. energy budgets (effort)
17 Historical development of aquaculture Summarizing: Aquaculture strong growth globally, but local differences. Large diversity in fish species cultured.. Large variety in culture conditions... From open to more closed/controlled conditions Young sector highly innovative
18 Content presentation Historical development of aquaculture Trends in fish nutrition/fish feeds EU fish nutrition projects ARRIANA Examples of issues in fish nutrition: Mineral requirements fishmeal replacement Minimizing waste production Do fish drink? Chyme conditions and digestion Enteritis in Salmonids and other fish
19 Trends in fish nutrition/fish feeds
20 Trends in fish nutrition/fish feeds Growth aquaculture sector mainly in fed species Source: FAO, The State of World Fisheries and Aquaculture.
21 Trends in fish nutrition/fish feeds Total feed used in aquaculture. 20% inclusion level ingredient 7 million tonnes Source: FAO, Demand and supply of feed ingredients for farmed fish and crustaceans. 14 million tonnes
22 Trends in fish nutrition/fish feeds Fish meal use in aquafeeds Other FW fish 9% Shrimp 28% Carps 15% Salmonids, marine fish and cyprinids consume over 60% of FM and over 80% of FO used for aquaculture Salmonids 27% Carps 6% Fish oil use in in aquafeeds Other FW fish 4% Marine fish 21% Shrimp 9% Marine fish 14% Salmonids 67%
23 Trends in fish nutrition/fish feeds Aqua-feeds less Fishmeal/-oil used Source: FAO, The State of World Fisheries and Aquaculture.
24 Trends in fish nutrition/fish feeds Summarizing: Historically with intensification fish species concentrated diets, increasing fat content Growing sector more aqua feed needed Doubling Composition limited amount of FM & FO Alternative ingredients
25 Content presentation Historical development of aquaculture Trends in fish nutrition/fish feeds EU fish nutrition projects ARRIANA Examples of issues in fish nutrition: Mineral requirements fishmeal replacement Minimizing waste production Do fish drink? Chyme conditions and digestion Enteritis in Salmonids and other fish
26 EU fish nutrition projects ARRIANA EU projects (FP5&FP6) last 15 years, fishmeal (FM) and oil (FO): PEPPA FM replacement by plant protein sources (trout, gilthead seabream) RAFOA FO replacement by veg oils (salmon, trout, European seabass) Gutintegrity effects of dietary factors on gut (salmonids) => FORM for collective dissemination to stakeholders Aquamax, FP6 integrated project, combined replacement of FM & FO (salmon, trout, seabream, carps) ARRAINA, FP7 FO & FM devoid diets: full life cycle, nutrient requirements... (salmon, trout, seabream, European seabass, carps)
27 EU fish nutrition projects ARRIANA Background More than 300 species are farmed around the world But, quantitative data on the needs for all essential nutrients are available only for a few species Not accounting for life stage
28 EU fish nutrition projects ARRIANA Species with different life cycles
29 Content presentation Historical development of aquaculture Trends in fish nutrition/fish feeds EU fish nutrition projects ARRIANA Examples of issues in fish nutrition: Mineral requirements fishmeal replacement Minimizing waste production Do fish drink? Chyme conditions and digestion Enteritis in Salmonids and other fish
30 Mineral req. fishmeal replacement Background Fishmeal source of minerals Replacement plant ingredient: different amounts & forms (e.g. phytate) Within ARRAINA assessment of: Variability between fish species Within species (life cycle) Dietary factors Culture conditions
31 Mineral req. fishmeal replacement Factors affecting requirements: Meta analysis On available P basis variability < then on total P basis
32 Mineral req. fishmeal replacement Factors affecting requirements: Species differences
33 Mineral req. fishmeal replacement Factors affecting requirements: Species differences
34 Mineral req. fishmeal replacement Factors affecting requirements: Dietary factors
35 Mineral req. fishmeal replacement Factors affecting requirements: Culture conditions
36 Mineral req. fishmeal replacement
37 Content presentation Historical development of aquaculture Trends in fish nutrition/fish feeds EU fish nutrition projects ARRIANA Examples of issues in fish nutrition: Mineral requirements fishmeal replacement Minimizing waste production Do fish drink? Chyme conditions and digestion Enteritis in Salmonids and other fish
38 Minimizing waste production Farmed fish efficient convertors of feed protein/energy WRI, 2014
39 Minimizing waste production N & P retention in different farmed animals WRI, 2014 For fish There is much room for improvement
40 Minimizing waste production Fish nutrition faecal waste production (in RAS) Feeding level amount of faeces (waste) Digestibility diet amount of faeces (waste) Composition faeces system performance Physical properties faeces (stability) removal efficiency
41 Minimizing waste production Phd: Amirkolaie A.K Dietary carbohydrate and faecal waste in the Nile Tilapia (Oreochromis niloticus L.) Aim thesis: Does feed composition affect faeces stability?
42 Minimizing waste production 80 Faecal removal (%) *** Gelat. Native 50 Faecal waste
43 Minimizing waste production 80 Faecal removal (%) *** Gelat. Native 50 Faecal waste Chyme characteristics
44 Minimizing waste production
45 Minimizing waste production Recovery (stability) not affected (73 82%) Total faecal waste amount: enzyme effect diet dependent SFM diet 17% less faeces
46 Content presentation Historical development of aquaculture Trends in fish nutrition/fish feeds EU fish nutrition projects ARRIANA Examples of issues in fish nutrition: Mineral requirements fishmeal replacement Minimizing waste production Do fish drink? Chyme conditions and digestion Enteritis in Salmonids and other fish
47 Do fish drink? Chyme conditions & digestion Drinking... Do fish drink water?
48 Do fish drink? Chyme conditions & digestion Moisture content
49 Do fish drink? Chyme conditions & digestion Water flux in the intestine with time after feeding stomach Prox. intestine Distal intestine Mid intestine
50 Do fish drink? Chyme conditions & digestion Dry matter content digesta with time after feeding stomach Prox. intestine Mid intestine Distal intestine
51 Do fish drink? Chyme conditions & digestion Water balance, water flux : If low in stomach high in proximal part intestine Stomach
52 Do fish drink? Chyme conditions & digestion Correlations between ADC and chyme DM content Current research topic: nutrition gut physiology
53 Content presentation Historical development of aquaculture Trends in fish nutrition/fish feeds EU fish nutrition projects ARRIANA Examples of issues in fish nutrition: Mineral requirements fishmeal replacement Minimizing waste production Do fish drink? Chyme conditions and digestion Enteritis in Salmonids and other fish
54 Enteritis in Salmonids and other fish Soy bean meal induced enterites in salmonids Location 2nd gut segment: Mucosal folds Sub-epithelail mucosa Lamina propria wider Eosinophilic granulocytes Supranuclear vacuoles Fishmeal diet 20% Soybean meal diet Cause still not clear Saponine?... Uran, 2008
55 Enteritis in Salmonids and other fish Soybean meal induced enterites in other fish? Week 0 Week 1 Week 4 Week 5 Also in carp: But in carp: Naive carp fed SBM enterites distal intestine Disappears with time Uran et al. (2008)
56 Thank you Aquaculture An ocean of opportunities!! 56
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