Chapter 7, Problem 61P

& BIO Salmon move upstream In the past, salmon would swim more than 1130 km (700 mi) to spawn at the headwaters of the Salmon River in central Idaho. The trip took about 22 days, and the fish consumed energy at a rate of 2.0 W for each kilogram of body mass. (a) What is the total energy used by a 3.0-kg salmon while making this 22-day trip? (b) About $80\mathrm{**\#x0025;}$ of this energy is released by burning fat and the other $20\%$ by burning protein. How many grams of fat are burned? One gram of fat releases $\text{3}\text{.8 }\times {\text{ 10}}^{\text{4}}\text{ J}$ of energy. (c) If the salmon is about $15\%$ fat at the beginning of the trip, how many grams of fat does it have at the end of the trip?