Clams are aquatic biota that do not have a spine, belonging to the phylum Molluscs class Bivalvia. This study aims to determine the density, morphomteric differences of S. woodiana clams based on depth. The sampling technique used Purposive sampling method, with 1x1 meter plot and repetition 3 times. Data collection was carried out in July 2022 until completion. The results showed that the highest density of S. woodiana clams was found at a depth of 0-50 cm with an average density of 29.3 individuals/meter. Small size clams were dominantly found at a depth of 0-50 cm with a percentage reaching 97.92%, 54.46% of medium size clams were found at a depth of 50-100 cm, while 83.33% of large size clams were found at a depth of 100-150 cm. Anova test results showed significant differences with a 95% confidence interval. At a depth of 100-150 cm, the weight value of S. woodiana clams was 24.87 ± 3.36 grams, shell length 43.73 ± 1.21 cm, shell width 38.73 ± 1.76 cm, and umbo height 22.83 ± 0.76 cm. The results of this study can be concluded that the shallower the waters, the higher the density of shells, but the large size of the shells, the smaller the density.
Gastropods are soft-bodied animals with stomachs as legs, live in land and waters, and have dominant nature in the area they inhabit, especially in the Lanaga Waters, Meureubo District, West Aceh Regency. This study aimed to (1) analyze the dominance level of each species of the Gastropod class inhabits the Lanaga Waters, and (2) determine the species of Gastropods dominates the Lanaga Waters, Meureubo District, West Aceh Regency, Aceh Province. The research was carried out from January to March 2021, in the Lanaga Waters, Meureubo District, West Aceh Regency, Aceh Province. The research area was divided into 9 stations based on the conditions of the aquatic environment, and each station was assigned to five sampling plots. Data were collected using purposive sampling technique, and data analysis was analyzed using the dominance formula and further described. The results showed that (1) the dominance index of each species of the Gastropod class ranged from 0.00001 to 0.710716, indicating a low to moderate level of dominance, and (2) the species from the Gastropod class dominated the Lanaga Waters, Meureubo District, Aceh Barat was Faunus ater, with a moderate level of dominance
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