Biology and ecological functional of Genus Crassostrea (Bivalvia: Ostreidae): a review

The genus Crassostrea has an important role for community life in coastal and mangrove ecosystems. In this article, we try to review in detail the ecology, biology, and ecological functions of Crassostrea spp. Furthermore, we also review about 25 species of Crasostrea that exist in the world and also have a high level of adaptation. Based on ecological functional, Crassostrea acts as an efficient engineer of ecosystems, where in forming ecosystems, in nutrient cycling, in reducing anthropogenic eutrophication, shelter area, breeding grounds, and as a link between benthic-pelagic. In addition, high Crassostrea communities can form reefs and serve as ecologically important for diverse species.Keywords:Marine BivalvesCommunity Anthropogenic EcosystemsFunctiona

Molecular characterization of Tapah fish (Wallago leerii, Bleeker 1851) from Riau Province based on Cytochrome b gen

Tapah fish (Wallago leerii) is a fish with high economic value in Riau Province. Molecular research on W. leerii is very important to do. This study aims to determine the molecular characteristics of W. leerii from Riau Province based on the Cytochrome b gene. The universal primer Cytochrome b is used for the Polymerase Chain Reaction (PCR) process. The PCR result is a partial Cytochrome b gene with a length of 373 bp. Multiple alignments were performed on nucleotide sequences of the Cytochrome b gene of W. leerii from river of Tapung and Indragiri Riau with the cytochrome b gene of other fish from Genbank and analyzed using the MEGA program version 6.0. Phylogenetic construction using the Cytochrome b gene can distinguish W. leerii from river of Tapung and Indragiri Riau, with other species. Keywords: Alignments Molecular GenBan

Check list of marine fishes from Simeulue Island waters, Aceh Province, Indonesia

The objective of the present study was to inventory the marine commercial fishes in Simeulue waters, Aceh Province, Indonesia. Sampling was conducted on August 2017. The sampling was conducted in fish landing and direct sampling by using handline hooks and casting net. A total of 77 species of marine commercial fishes belong to 7 orderS, 26 families and 54 genera were recorded during the study. Serranidae was a predominant family with 14 species followed by Lutjanidae with 13 species and Carangidae 9 specie

The negative effect of the chicken feather meal in the diet on growth performance of the shortfin eel Anguilla bicolor larvae

The aim of these study was to examine the effect of the replacement fish meal with chicken feather meal (CFM) for eel Anguilla bicolor larvae. The study was conducted at the Laboratory of Ichthyology, Faculty of Marine and Fisheries of Syiah Kuala University on September to October 2017. The Complete Randomized Design (CRD) with 7 treatments and 4 replications were used in this study. The  tested dosage of CFM were of 0% CFM (control), 10% CFM, 20% CFM, 30% CFM, 40% CFM, 50% CFM and 60% CFM, where each treatment were contained of protein 32.26% (0% CFM), 33.09% (10% CFM), 36.20% (20% CFM), 39.10% (30% CFM), 41.22% (40% CFM), 45.43 ( 50% CFM) and 40.02% (60% CFM). The experimental fish were stocked in the plastic container at the stocking density of 15 fish container-1 and fed the experimental diets at the feeding level of 10% body weight a day for 60 days. The results showed that the application of CFM in the diet was not given a significant effect on the weight gain, daily weight gain, specific growth rate (P0.05). In addition, the fish fed on CFM did not show growth rate even reduces the body weight of the experimental fish. It is concluded that the application of the CFM in diet gave the negative effect on the growth performance of the eel larvae

Biometrics of the gastrointestinal tract of Tor tambra and Tor soro from Aceh, Indonesia

The gastrointestinal tract of native fish shows structural and functional diversity, which is related to different dietary requirements, feeding habits, phylogeny, age, body shape, and sex. There is some research that discusses the digestive tract of fish, but research on the digestive tract of Tor tambra and Tor soro is still limited. The purpose of this study was to describe the biometrics of the stomach and intestines of T. tambra and T. soro harvested from Leuser Ecosystem Area. This study included sample collection, sample preparation, gastrointestinal biometrics, and data analysis. The observation parameters include GaSI (Gastro Somatic Index), ISI (Intestine Somatic Index), RGL (Relative Gut Lengths), and RIL (Relative Intestine Lengths). The measurement data were tested using analysis of variance (ANOVA). The results showed that the highest GaSI, ISI, RGL and RIL values were in T. tambra with respective values of 0.50±0.24%, 2.46±0.58%, 44.35±5.22%, and 340.37±33.99%, while the lowest values were found in T. soro, whereas 0.22±0.07%, 1.57±0.55%, 32.03±14.99%, and 259.62±65.74%, respectively. The results of the statistical analysis showed that there were significant differences (P0.05) between the two species

Identification of pathogenic bacteria (Vibrio sp) in the waters of the industrial area of north aceh regency and lhokseumawe city

North Aceh Regency and Lhokseumawe City’s waters are mangrove ecosystems, estuaries, fisheries management activities, and industrialization activities. Activities in the industrial areas of North Aceh Regency and Lhokseumawe City have the ability to contaminate waters and affect the chemical and physical composition of the water, which has a direct impact on the abundance of harmful bacteria (Vibrio sp). The study looked at the distribution of harmful bacteria (Vibrio sp) in water near industrial areas in North Aceh Regency and Lhokseumawe City. The purpose of this study is to investigate the abundance of pathogenic bacteria (Vibrio sp.) in the waterways of North Aceh Regency and Lhokseumawe City's industrial areas. This study will also look into the relationship between water quality factors and the abundance of harmful bacteria. The study was carried out in July and August 2023 at four stations placed in marine waters near the industrial area. The research methods used in this research are survey methods and laboratory analysis. Purposive sampling and the ANOVA test were the analysis and sampling techniques employed in this study. The findings demonstrated that there was no discernible variation in Vibrio parahaemolyticus between stations 1, 2, 3, and 4. Station 2 saw a strong Vibrio cholerae effect (p > 0.05), resulting in 87.20 74.36b CFU/ml. Vibrio total from the four research stations that significantly affected station 2 (p > 0.05) were 280.00 167.26b CFU/ml

A comprehensive description of the exoskeleton of six Lobster species (Genus Panulirus) in Aceh Province, Indonesia

Lobster (Panulirus spp.) is a leading commodity on a local and export scale in Aceh Province, Indonesia, where the population has experienced a significant decline in recent years. This study describes the exoskeleton morphology of six lobster species distributed in Aceh Province, Indonesia. The research was carried out in 2022 with stages covering sample preparation, sample shooting, and morphological analysis. The results of the study showed that there were six lobster species in Aceh including Panulirus penicillatus, P. homarus, P. longispes, P. ornatus, P. versicolor, and P. polyphagus. The anatomy of the lobster exoskeleton of six species of P. penicillatus, P. homarus, P. longispes, P. ornatus, P. versicolor and P. phloyphagus has marked differences, where each part of the cephalothorax (cervical sulcus, sternum, epistome, maxillaped, pereiopod), Abdominal (segment, pleura, pleopod) and caudal (telson, uropod, and protopod) have different shapes. In addition, differences were also found in the color and presence of spines on the dorsal bod

Lobster (Panulirus spp) catch in simeulue waters, aceh province: composition and results

Aceh Province's main export is lobster. This commodity commands a high economic price in Simeulue Regency, which boasts exceptional commodities in the fisheries industry, particularly lobster. The purpose of this study is to describe the composition of the catch and the productivity of the catch of six different varieties of lobster in the Simeulue water. The research methods employed include field surveys to collect data directly from fishermen. The study was carried out in Simeulue waters in numerous areas in 2023, including Busung, Kampung Air, Teupah Selatan, and Alafan. The types of samples taken were six species consisting of Panulirus homarus, P. longipes, P. penicillatus, P. versicolor, P. ornatus and P. polyphagus. The research results showed that the catch comprised lobster species such as Panulirus homarus, P. longipes, P. penicillatus, P. versicolor, P. ornatus, and P. polyphagus. The catch composition was dominated by Panulirus penicillatus (44%) and P. versicolor (23%). The length and weight growth of the six varieties of lobster is allometric, which is vital for sustainable fisheries management. The research findings also show oscillations in the supply of Simeulue lobster shipments, with peak delivery in 2022 (246,157 ind) and a fall in 2023 (57,654 ind). It is critical to underline the need for sustainable management in maintaining a balance between usage and conservation of fishing resources

Turbidity effect derived from palm oil mill effluent altered predation period of siamese fighting fish (Betta splendens, Regan 1910)

Contamination of palm oil mill effluent (POME) into water bodies potentially increases turbidity, resulting in disrupting aquatic organisms behaviour, including predation period. However, the effect of increased turbidity due to POME contamination toward the fish predation is still unexplored. Siamese fighting fish (Betta splendens) is one of the ideal test fish to investigate this effect. This study aims to analyze the effect of increased turbidity due to POME contamination toward the fish predation period of Siamese fighting  fish. The research design was completely randomized with six treatments (0, 20, 40, 60, 80 and 100 NTU) followed by five repetitions for each treatment. The experimental data parameters include the predation rate of Siamese fighting  fish during foraging activity, which was calculated from the percentage of the number of mosquito larvae consumed per 2 min during 15 min. The significance level of predation between treatments in each observation time period was analyzed using a one-way Analysis of Variance (ANOVA) with the confidence interval set at the 95% level.  The results showed that at a turbidity level of 100 NTU, the predation period of Siamese fighting  fish had been altered. In the period of 0-2 min, the predation rate decreased significantly. Meanwhile, the predation rate increased significantly during the period of 2-4 and 8-10 min. This finding should be considered  to support POME remediation management, especially turbidity parameters. Keywords: POME Feeding period Foraging area Turbidit