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The condition of the Porong River has experienced a decline in water quality caused by detergent pollution containing surfactants. Accumulation of surfactants that have not been well-degraded can have negative impacts on the aquatic ecosystem. The aim of this research is to analyze the water quality parameters and surfactant concentrations in the Porong River, as well as to determine their correlation. The method used in this study is the descriptive survey method. Data collection was carried out at 3 stations using purposive sampling method. Data were collected in three replicates. Based on the data obtained from the water quality parameter measurements, the temperature ranges from 27.8 to 29°C, TDS levels range from 249.9 to 652.1 mg/L, TSS levels range from 4.1 to 37.9 mg/L, pH values range from 6.7 to 6.8, DO concentrations range from 5 to 5.6 mg/L, nitrate concentrations range from 1.09 to 1.23 mg/L. The results of surfactant measurements in the water range from 3.6 to 7.8mg/L. The relationship between water quality parameters indicates a positive correlation or interdependence among them. Furthermore, high surfactant content in the water leads to a decline in water quality, thereby adversely affecting aquatic ecosystems.

Riparians vegetation can improve water quality, feeding grounds, spawning grounds, nursery grounds, and shelter grounds for fish. The aim of this research is to determine the types of riparian plants, types of fish and water quality in Klampok Swamp, Senggreng Village, Malang Regency, East Java. This research was conducted using the survey method to determine the types of riparian plants, types of fish, and water quality in Klampok Swamp, Senggreng Village, Malang Regency, East Java. The data is taken from 4 stations determined by the riparian cover. The station I with 100% riparian cover, station II (70%), station III (40%), and station IV (5%). The fish obtained from the research results in Klampok Swamp are betta fish (Osphronemidae), blue panchax (Aplocheilidae), snakehead (Channidae), marble goby (Eleotridae), guppy (Poeciliidae) or million fish, tilapia and the red devil (Cichlidae), goby fish and transparent goby fish (Gobiidae). Found 14 families of riparian, with the most species being Asteraceae (7 species of cosmos). The families in all stations are Poaceae or grains and Amaranthaceae (spinach). Water quality indicates waters that are good for fish and other organisms. [ABSTRACT FROM AUTHOR]

The high demand for carp as consumed fish nor decorative fish, causes an increasing production. However, an obstacle occurs in production, due to the reproductive characteristics of Common Carp fish. Different times in sperm and egg production from male and female fish cause difficulties in breeding. Hence, it needed sperm preservation so the breeding could be done for the whole year. Natural extenders are the solution to preserve fish sperm without side effects. The purpose of this study was to determine the effect of different types of extenders and different doses on the percentage of sperm motility and viability of carp (Cyprinus carpio) after storage This research was conducted at the Faculty of Fisheries and Marine Sciences, Universitas Brawijaya and the Freshwater Cultivation Installation (IBAT Punten), Batu, East Java. The method in this study was Complete Random Design (CRD) with 6 treatments, K (100ml lactate ringer); A (1ml cider + 99ml lactate ringer); B (1ml coconut + 99ml lactate ringer); C (1ml date juice + 99ml lactate ringer); D (1ml honey + 99ml lactate ringer); E (1ml sugar cane + 99ml lactate ringer). The results showed that the highest motility was obtained in the treatment using date extract extender with a motility percentage rate of 77.66%; the highest viability was obtained in the honey extract with 80.71%; and the highest fertility rate was obtained in the honey extract treatment with 72.67 %. [ABSTRACT FROM AUTHOR]