FAO aquaculture data

[gclawson1]

@cottrellr I noticed that you filtered the FAO aquaculture data for species == "Atlantic salmon" only. I was curious, so I took a look at other salmon species (e.g. Coho(=Silver) salmon), and the numbers aren't insignificant (Chile has ~200000 tonnes for coho). Should we consider adding these species? :

[cottrellr]

It's really up to you for any analyses going forward. I chose Atlantic salmon for the origins paper because:

1) it's the species of greatest production, investment, and the one that had the most selective breeding and so changes to feed reflect that 2) that's what all the feed data is coming from 3) I didn't have any resolute data on the feed differences or feed conversion ratio differences at country level between species so, functionally, adding those species biomass basically just assumes a greater biomass of Atlantic salmon (rather than getting us closer to reality, per se) 4) the origins paper is more of a thought experiment so keeping it to one species gave it nice boundaries.

If the Atlantic salmon was filtered in this repo, that was probably just a hang up from me originally starting biodiversity analyses in this one, then swapping to the origins paper, and there was some code sharing between the two. So I'm happy with whatever you would like to do. Maybe worth looking into whether there are any notable differences in the feed of salmon species and the feed conversion ratios as that will be needed to weight their raw material demand if there are substantive differences. Alex J might have some for Chinook/King?

[gclawson1]

Found this paper looking at Chinook diets. They say the standard industry diet for Chinook is this:

This is pretty different from the Atlantic Salmon diet reported in Aas et al.

This paper (although a bit dated suggests that Coho salmon feed is primarily made up of fish meal/oil. They also say that Coho salmon are extremely sensitive to dietary changes, especially when adding soy, so it seems like a plant-based diet isn't as viable for pacific salmon species.

Since Atlantic Salmon represents >90% of production. I'm thinking that just sticking with Atlantic Salmon only is probably what I'll end up going with. It seems justifiable, given that production of coho and chinook is so small elsewhere, and the diets and sensitivity to changes are so vastly different.

[cottrellr]

Yeah I think you are right to stick to Atlantic salmon – and it’s where the evolution of feed formulation is the most interesting.

Amazing to see such high inclusion levels as a standard diet. I’m guessing dietary inflexibility has been a major barrier to growth.

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Richard S. Cottrell Research Fellow in Aquaculture Sustainability Institute for Marine and Antarctic Studies College of Sciences and Engineering University of Tasmania

Theme Co-Lead, Sustainable Futures and Planetary Health Centre for Marine Socioecology University of Tasmania

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From: Gage Clawson @.> Date: Wednesday, 22 March 2023 at 9:56 am To: Sustainable-Aquafeeds-Project/feed_biodiv_impact_mapping @.> Cc: Richard Cottrell @.>, Mention @.> Subject: Re: [Sustainable-Aquafeeds-Project/feed_biodiv_impact_mapping] FAO aquaculture data (Issue #3)

Found this paperhttps://link.springer.com/article/10.1007/s40071-019-00241-3 looking at Chinook diets. They say the standard industry diet for Chinook is this:

[image]https://user-images.githubusercontent.com/33332753/226764698-36a02d51-75c4-4909-83f3-9e869aa9d055.png

This is pretty different from the Atlantic Salmon diet reported in Aas et al.

This paperhttps://www.sciencedirect.com/science/article/pii/S0044848612004218 (although a bit dated suggests that Coho salmon feed is primarily made up of fish meal/oil. They also say that Coho salmon are extremely sensitive to dietary changes, especially when adding soy, so it seems like a plant-based diet isn't as viable for pacific salmon species.

Since Atlantic Salmon represents >90% of production. I'm thinking that just sticking with Atlantic Salmon only is probably what I'll end up going with. It seems justifiable, given that production of coho and chinook is so small elsewhere, and the diets and sensitivity to changes are so vastly different.

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[bshalpern]

agree with Rich on this - stick with Atlantic salmon diet. but yes, crazy to see these differences!

[juliablanchard]

yep I agree too - best to stick with Atl. salmon feeds for this; though could be useful in future if we look at a range of particular species

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From: bshalpern @.> Sent: Wednesday, 22 March 2023 12:03 PM To: Sustainable-Aquafeeds-Project/feed_biodiv_impact_mapping @.> Cc: Subscribed @.***> Subject: Re: [Sustainable-Aquafeeds-Project/feed_biodiv_impact_mapping] FAO aquaculture data (Issue #3)

agree with Rich on this - stick with Atlantic salmon diet. but yes, crazy to see these differences!

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