Yep, 250 for fish is way too hot. What type of smoker do you use?
Here is my general list or info.
Do you brine or not? Do you use a rub? (I make my own) and it needs to be on the meat at least over night; I like 2 days.
Keep meat moistened with a spray bottle every 20 minutes or so when you add wood chunks.
Have meats fully thawed (I try to only use fresh/non-frozen). Allow meat to come to just above room temp (Allow it to sit out for about 45mins or so) before placing on a grill or in the smoker.
Cooking time depends on many factors: the type of meat, its size and shape, the distance of food from the heat, the temperature of the coals, bone-in or boneless, and even the weather. It can take anywhere from 4 to 14 hours to smoke meat or poultry, so it's imperative to use thermometers to monitor temperatures. SIZE, SIZE, SIZE matters! LOL, the wife made me type that!
Air Temperatures in the smoker between 175 - 200 degrees. (Pork & Beef)
Air Temperatures in the smoker between 100 - 150 degrees. (Fish)
GUESS-T-MATE used for MY smoker = between 1.3 and 1.6 hrs per pound. (Pork & Beef) USE a meat thermometer for sure!
Smoke food to a safe minimum internal temperature.
* Beef, veal, and lamb steaks, roasts, and chops may be cooked to 145 °F.
* All cuts of pork to 160 °F.
* Ground beef, veal and lamb to 160 °F.
* All poultry should reach a safe minimum internal temperature of 165 °F.
* Alder - light, delicate flavor excellent for salmon, chicken and pork
* Apple and Cherry- sweet, fruity flavor that's great for poultry, game birds and pork
* Hickory - strong, pungent bacon-like flavor used for beef, pork and ham. This is the most popular of flavoring woods
* Maple - a sweet, smoky flavor ideal for game meat, poultry and pork
* Mesquite - a little sweeter than hickory, but still strong, this wood is great for richly flavored meats such as lamb, beef, and duck
* Pecan - a subtle, but rich flavor that complements any turkey or other poultry
In addition to these common woods, there are varieties of exotic woods such as plum, peach, and guava, and still other chips are made from wine and bourbon barrels. The options and flavors are virtually limitless!
KEEP A JOURNAL of what works for you and your smoker.