A well formed fish mark is always a boon to the subject. A clearly formed fish mark will show that the planet Jupiter is strong in the hands and horoscope of the subject. The subject will be financially strong and learned and good-hearted, and enjoy a post of authority. It is excellent for a woman to have a clear strong fish mark on her palms. If she is a housewife, it is clear indication that her husband will rise materially in life. This will be all the more certain if the favorable strong fish mark is found in the woman's right hand. This is because in the Indian Hand Reading System the right hand reveals something of the material prospects of the husband. This only applies if the woman is fated to have only one marriage in this birth. In Indian Palmistry and astrology the destiny of the husband and wife are inter related due to the karma of their previous life or lives.
The fish mark can be found on Mount of Moon in the palm but in general it is found near the wrist and frequently attached to the Life line. The fish mark may or may not have an 'eye' mark to it. If the fish symbol has the face pointing towards the wrist the subject will rise in life in middle age but if the face of the fish points towards the fingers then the subject will be blessed with prosperity at an earlier age. Also in this case these blessings will basically last throughout life.
Let us assume that a married woman has a clear strong fish mark on her palms. In this case she will not be childless if she keenly desire children. This should be of interest to gynecologists. But the important point to note is that the fish sign must be clear and prominent.
Above Image is example of fish mark (mastya sign) on hand. For more detail about fish tail and fish sign read this article
Fish Sign In Hindu Palmistry