The generic local name, mural, refers toa group of fishes found in the Palk Bay. It comprises ray-finned fishes such as halfbeaks and needlefish (distinguished from halfbeaks by their long needle-shaped jaws). This group of fishes is often not listed in country- level statistics as having any commercial value merely on account of the fact that European consumers do not and its green flesh appetising. However, these tropical fish are consumed in many domestic markets across the world and the freshly prepared fish is a delicacy obtained only in the coastal towns of Palk Bay.
Early records of studies conducted by CMFRI scientists show that nearlyall villages of the Palk Bay were involved in this fishery. Fishers corroborate this, stating that many fisher familiesknew the techniques of making the special mural nets (mural valai). Today, mural valai specialists are found mainly in Mullimunai and Morepannai although some families in Kollukadu continue to teach this technique to younger generations. This net is now mostly made by older men and women since it is a time-consuming operation that requires being at home for long hours. Each net takes about a full week to complete.
Scientists distinguish species of needle fish from one another based on small morphologic differences. The shape of the beak, markings on the body, length and shape of the caudal fin as well as colouration, pigmentation, length of pectoral fins, number of rays in the fin and so on are examples of such morphological features.
Vernacular names of mural often do not overlap with these scientific distinctions between different species of fish. For instance, the local name belt mural refers to the species known to fisheries scientists as Ablennes hains which has distinct bands through the lengthof its body. However, for species that do not have very clear distinctions a more generic name is used. For instance, the kalinga mural refers to fish that belong to the scientific genus Strongylura but in contemporary times no further distinction is made between species of this genus. Experienced fishers often make fine distinctions between species, but unless these distinctions are identified and passed on to newer generations of fishers, traders and other actors involved in fisheries, such information is likely to get coarser as time passes on.