Scientists recently tried something new with tambaqui fish, a type of Amazonian fish. They added different amounts of an essential oil from a plant called Croton conduplicatus to their food. This oil has certain compounds like 1, 8-Cineole, p-Cymene, and α-Phellandrene. The fish were fed this special diet for 60 days and then exposed to a bacterial infection called Aeromonas hydrophila for another 14 days.

The fish seemed to like the food with the oil better. They ate more and grew faster, especially when the diet had around 0. 85 milliliters of oil per kilogram of food. This helped them use their feed more efficiently. However, the oil didn't seem to protect the fish from the bacterial infection.

Before the infection, the oil affected the fish's blood and body chemistry. It changed the number of red blood cells and increased hemoglobin levels, a protein that carries oxygen. It also altered the levels of glucose, cholesterol, and certain enzymes in the plasma and liver.

After the infection, the fish not given any oil had the highest blood sugar and albumin levels. Meanwhile, the fish receiving 0. 5 milliliters of oil per kilogram of food had bigger red blood cells and lower liver enzyme activity.

Even though the oil didn't protect the fish from the infection, it did seem to make them grow better and improved some of their blood and body chemistry. So, scientists think adding about 0. 85 milliliters of Croton conduplicatus essential oil per kilogram of tambaqui food is a good idea.

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