In a glass
dish, marinate the fish in the lemon and lime juices for about 30
minutes. Meanwhile, in a large skillet bring the stock to a boil. Add
the onion, celery, green pepper and garlic. Simmer 15-20 minutes, until
tender. Reduce the heat and add the tomato paste, tomatoes, capers,
jalapeno peppers and oregano. Cook until slightly reduced.
Place the
fish in the pan with the sauce. Simmer 15-20 minutes, until the fish is
opaque. Place a fillet on each plate and sprinkle with cilantro. Garnish
with a slice of lime.