Eli Lilly ($LLY) has been doubling down on its efforts to invent new animal vaccines--opening a 48,000-square-foot research facility near its Indianapolis headquarters, for example, that its animal health division, Elanco, will use for R&D. On the production-animal side of the business, Elanco’s bread and butter until now has been cattle and swine products, but the company is looking to expand into a rapidly growing corner of food production where it has had virtually no presence: aquaculture.