Large number of fish breaking the surface of the Holy Sarovar o the Golden Temple complex in Amritsar

The sarovar of the Golden Temple complex is teeming with fish (the varieties are not very clear to me though), with both golden colored fish and black-grey colored fish being found very easily (you go near the tank and you will see these fish coming to the surface). In this photo, you can find a large number of fish at the surface of the water.