[Show abstract][Hide abstract] ABSTRACT: The objective of the present study was to evaluate the characteristics of mud clam ovaries (Geloina erosa) harvested from estuary areas of Reuleung River, Aceh Besar District, Indonesia. The sampling was conducted three times in June, July and August 2014. The clams were measured and weighed for cohort analysis using FISAT software and ovaries of a representative of each group length class was taken randomly for histological analysis. A total of 261 clams were sampled during the study which resulted in one cohort and two groups of shell-length classes i.e. 36.37– 49.09 mm (group A) and 49.09–61.81 mm (group B). Most of the oocytes in group A were at a late developing stage, while mature oocytes were predominant in group B, indicating that bigger clam have higher gonadal development stage. The ovaries of every group had several oocytes development stages, indicating anasyncronous spawner.
[Show abstract][Hide abstract] ABSTRACT: The objective of the research was to determine the pathogenicity of probiotic-potential bacteria isolated from the common carp (Cyprinus carpio) collected from the Jantho region, Aceh Province, Indonesia. The research was conducted from July to September 2014 at Microbiology Laboratory and Hatchery Laboratory, Syiah Kuala University. A completely randomized design with single factor at five levels of treatment with three replications was used in this study. The treatment was A, positive control of Aeromonas hydrophila; B, the negative control of Phosphate Buffered Saline (PBS) solution; C, D, and E, probiotic-potential bacteria A, B, and C, respectively. The ANOVA test showed that the inoculation of probiotic-potential bacteria had a significant effect on the growth rate (p < 0.05), but did not have significant effect on the survival rate (p > 0.05). It was concluded that three isolates can be used as probiotic-potential bacteria based on pathogenity assay. Introduction. Common carp (Cyprinus carpio) is one of the most cultivated freshwater fish worldwide due to its considerable economic value (Stankovic et al 2011). There are various types and strains of common carps indicated in their physical forms, shapes and colors as a result of interaction between genotypes and habitats, seasons, and culture systems. This species was a favorite fish target for aquaculture farmers in Aceh Province, Indonesia especially in the Jantho region, Aceh Besar District. However, the farmers claimed that many cultivated carps were infected by diseases because of reduced production and profit. The farmers used antibiotics to control and inhibit the growth of pathogenic micro organisms; this drug was administered to treat bacterial infections. However, this method is costly and generates side effects not only for the bacterial pathogens but also for the cultivated fish. Prolonged use of antibiotics caused the pathogenic bacteria to be resistant and reduced the effectiveness of antibiotics. For the cultured fish, antibiotics may lead to bioaccumulation in the fish bodies creating a carcinogenic effect on humans who consume this contaminated fish (Bruno et al 2000). The application of probiotic bacteria as biocontrol agents in fishery is one alternative to addressing the problems of diseases caused by bacterial pathogens (Irianto & Austin 2002). The incidence of microbial pathogens, especially those of bacterial origin, is one of the most significant factors affecting fish culture (Post 1989; Zorrilla et al 2003). The activity of probiotic bacteria can inhibit the growth of pathogenic bacteria without generating any adverse effects on the ecological balance system of bacteria (Feliatra et al 2004). Nowadays, use of probiotics in aquaculture is mostly focused on improving the digestion rate and growth performance of fish, while study on the probiotic potential bacteria for preventing disease is very limited. Therefore, the objective of the research was to analyze probiotic-potential bacteria which was effective to inhibit Aeromonas hydrophila growth and no pathogenic effect to common carp.
[Show abstract][Hide abstract] ABSTRACT: The study of the lenght weight relationships and condition factors of the brackiswater fishes found in Kuala Gigeng was conducted. The objective of the present study was to evaluate the growth pattens and condition factor of the belanak (Mugil cephalus), seriding (Ambassis koopsii) and petek (Leiognathus
fasciatus). The sampling was conducted for eight time on July 2011 by using gillnet and castnet. The results showed that the belanak (M. cephalus) and seriding (A. koopsii) have allometric negative growth patten, while the petek (L. fasciatus) has an allometric positive. In addition, the relative weight condition factor’s was higher than 100. And the Fulton’s condition factor were not different significantly among fishes. Indicating the condition of the Kuala Gigeng is relatively in good condition and support fish growth as well.