Here is the Facts on Food Pathogens including Human and Animal Infection. Use your judgement. There really is more of a YUCK Factor than a risk of getting Sick...
Fresh water fish carry, Salmonella, Listeria, Vibrio, Yersinia and Clostridium Botulinum, the source of Botulism, in their Intestinal Tract, just like Chicken and other land animals. There is no issue feeding Fish or Chicken guts to Chickens, cause they already have the same Pathogens in their gut.
Intestinal Bacteria does Not Infect Healthy Meat Muscle, unless YOU CAUSE IT TO. Infection happens by Sloppily removing the guts, getting Fecal Matter on the meat and everywhere else, and then not washing the carcasses well. Once well washed, It is important that you then Chill the birds, get temp below 70°F in 2 hours and Ice or Refrigerate, get temp below 40°F in the following 2-4 hours. This is not hard with plenty Ice Water on hand during processing.
Mad Cow Disease can only Infect Chickens, and Humans if they eat the Infected Brain or Nervous System, Spinal Cord, etc, and some feel Lungs. Currently there is only One Documented Case of Human infection in the USA and that guy got infected in ENGLAND. Just Don't feed English Cow Brains to your Chickens and there will be nothing to worry about.
TRICHINOSIS, Was once common because Hogs were fed Raw Rotting Garbage. Since the 40's that practice was Banned and although Hogs still are often fed Food Waste, in MUST be cooked to kill Trichinella and other Pathogens. With a few exceptions on small farms, according to the CDC, there has not been a documented case of Pork Trichinosis post WWII from eating undercooked Pork. There are a few cases from folks eating Rare Cooked Wild Bear Meat and in Alaska, several cases of from natives eating traditionally fermented Stink Heads. Raw Salmon Head fermented buried in beach sand for a year, until thoroughly Rotten and STINKY!!!
Studies have not shown Trichinella in Chicken meat, even if they eat infected Rats, Mice, Cats, three most susceptible animals, or Rotting Garbage. NO WORRIES HERE EITHER!
Cook PORK to an Internal Temp (IT) of 145°F, just a Blush of Pink, and Chicken to an IT of 165°F, Well Done but Juicy. Use a tested good, Leave in the Meat or Instant Read Thermometer. You can test for Boiling Water to be 212°F at Sea Level, adjust for Elevation.
Hope this helps. BTW...I am a Retired Certified Food Safety Instructor and have taught hundreds of Students this stuff....JJ