Kepadatan, Pola Distribusi dan Pola Pertumbuhan Kerang Darah (Anadara granosa) di Perairan Pantai Sialang Buah, Kabupaten Serdang Bedagai, Sumatera Utara

Abstract

Bivalve, Arcidae granosa, has a high economic value. It cause, the activity of clam harvest among community in Sialang Buah Beach increase in order to take the blood mussel as many as they can. It is feared, the population of blood clams to decrease in on that beach. The research conducted aimed to determine the density value, the distribution pattern and the growth pattern of blood clam as well as the correlation analysis to the physical factors were examined. This study used the "Purposive Sampling" method consisting of three stations based on the presence or the absence of human activity around the station. 1st Station was an activity-free area, 2nd station was a tourist area and 3td station was a stopover area for fishermen's canoes. The blood clam obtained was counted for the density, the distribution pattern was analysis using the moricita index formula, and the growth pattern analysis by calculating the length and total weight of individual blood clam and the relationship of aquatic chemical physical factors with blood clam density was obtained using pearson correlation analysis. The research showed, the highest density value was obtained at 1st station which was 0,78 ind / m² and the lowest at 3rd station which was 0,56 ind / m². The growth pattern of blood clam from each station was negative allometric with the value b < 3, means that the length was more dominant than weight. The distribution pattern of blood clam from each station was classified as clustered. And the results of correlation analysis show salinity, DO and C-organics had a very strong effect to the density of blood clam.