Not true. Salmon roe is a random item (I think). I had max out my salmon slice inventory. I had 20/20 salmon. Just gave a shot of cutting up a giant salmon in spite of this. Lo & behold got 1 salmon roe. Personally I feel Zynga should give out at least 1 salmon roe every time the fish is diced (Its hard enough getting random salmon fish from the moon pond) The random item would be that sometimes we get more than 1 salmon roe ;)