Many brands produce a smaller gelcap or capsule, I've found the ones sourced from Krill seem to be the smallest.

While there are no real guidelines on how much is a suitable daily dose, remember that the effective ratio of Omega 3 to Omega 6 is important, and Omega 6 is readily available in our diets so many people have a much higher ratio than the recommendation, so the options are decreasing the dietary intake of Omega 6, or balancing it with Omega 3.

"The recommended ratio of omega-6 to omega-3 fatty acids in the diet is 4:1 or less. However, the Western diet has a ratio between 10:1 and 50:1. Therefore, although omega-6 fats are essential in the right quantities, most people in the developed world should aim to reduce their omega-6 intake ( Exp Biol Med (Maywood NJ))"