Panen parsial adalah metode panen sebagian biomassa udang pada saat kegiatan operasional budidaya sedang berlangsung. Tujuan dari penelitian ini adalah menentukan konseptual model optimalisasi pengelolaan budidaya udang vannamei (L. vannamei) pola intensif berdasarkan prosentase estimasi panen parsial. Penelitian ini dilaksanakan dengan konsep desain kausal ex-post facto selama satu siklus budidaya intensif udang vannamei (L. vannamei). Hasil dari penelitian menunjukkan, selama masa budidaya parameter kualitas air yang meliputi pH, suhu, oksigen terlarut, nitrit, dan nitrat masih berada dalam ambang batas, sedangkan posfat, TAN, dan TOM berada diatas level ambang batas baku mutu untuk budidaya udang intensif. Untuk konsep model simulasi pengelolaan budidaya intensif dari skenario panen non-parsial, parsial 10%, dan parsial 20%. Sistem panen parsial 10% memiliki beberapa keunggulan dibandingkan dua sistem panen lainnya. Yakni, dengan diterapkannya simulasi panen parsial 10% didapatkan nilai efisiensi biomassa panen sebesar 88.08 kg dan efisiensi prosentase survival rate udang sebesar 11% dibandingkan dengan konsep panen parsial 20% atau non-parsial. Sehingga dapat disimpulkan, bahwa untuk konsep model pengelolaan budidaya udang vannamei (L. vannamei) pola intensif yang paling optimal berdasarkan hasil simulasi sistem pemodelan dinamis adalah konsep model budidaya panen parsial 10% dengan pelaksanaan panen parsial pada saat budidaya umur 60 hari.

The prevalence of disease spread caused by improper cultivation systems causes a decrease in the productivity level of vannamei shrimp ponds. A low salinity cultivation system is one of the cultivation innovations that can be developed to reduce the spread of disease. The purpose of this study was to describe water quality status on aquatic shrimp culture and business financial feasibility in the intensive vannamei shrimp (Litopenaeus vannamei) culture with low salinity levels. The research method used was quantitative descriptive with a purposive sampling technique of data collection. The result of the research is the Water Quality Index analysis value of 110 which means it is very suitable to be used as a cultivation medium. Profitability analysis produces a profit value of Rp. 244,456,603, R/C Ratio 1.35, BEP Unit 3,797, BEP Sales Rp. 188,745,587, and Profitability 35%. Meanwhile, the financial analysis of the business found that the NPV value was Rp. 19,627,985,863, the Profitability Index was 25.43%, the IRR was 27.55%, and the Payback Period was 5 years, which meant that this business was very feasible to be developed based on its financial feasibility status criteria. So that the overall, low salinity shrimp culture is very feasible to be applied when viewed from the ecological or economic advantage, and can be used as an alternative for vannamei shrimp aquaculture in areas that have the location of a pond far from the source of marine water.

Abstract. Fadjar M, Islamy RA, Herawati EY. 2019. Short communication: First record of Arapaima gigas (Schinz, 1822) (Teleostei: Osteoglossomorpha), in the Brantas River, Sidoarjo, East Java, Indonesia. Biodiversitas 20: 3527-3531. The arapaima (= Arapaima gigas) is the largest freshwater fish in the Neotropical region, obligate air-breathing fish that known to reach up to 3 m - 3.90 m in length and 200 kg in weight endemic to the Amazon basin. Arapaima gigas is giant osteoglossomorph and obligate air‐breathing fish and also a native species of the Amazon basin. We present the first record of Arapaima gigas (Schinz, 1822) in Brantas River, Sidoarjo, East Java, Indonesia with diagnostic meristic and morphometrics of the specimens analyzed following Stewart method. Herein, it recorded from the Brantas River basin. This record based on the finding of one live specimen on the tributary of Brantas River basin, and in situ observation of juveniles and adults in the river).

White feces disease which is the presence of white feces floating on the surface of the water. Physical disruption of white feces disease attacked by exocytes becoming soft. the cause of white feces disease (WFD) is a decrease in environmental quality such as salinity, dissolved oxygen and ammonia. White feces disease is associated with gregarine protozoa in the Apicomplexa phylum. Gregarine parasitic infection from the type of nematopsis that was interacted with Vibrio and Vibrio bacteria found in white shrimp (Litopenaeus vannamei) which was attacked by white impurities was V. harveyi. This study aims to analyze the presence of gregarine protozoa in the gills, intestines and hepatopancreas of white shrimp infected with white feces disease. The method used in this research is descriptive method. Histopathological results showed that there were protozoa (gregarine) in the intestine, hepatopancreas and gills of white shrimp infected with WFS in 3 different locations and found Aggregated Transformed Microvilli (ATM) that resembled gregarine.

The business of developing shrimp farming cannot be separated from the existence of disease. In shrimp farming health management, disease prevention strategies can use various methods, one of which is immunostimulant. One alternative immunostimulant source that can be used to improve the body defense system in shrimp is squid (Loligo sp.) ink extract powder who has antibacterial ability. This study aims to analyze the presence of active compound in squid ink extract powder can be used as an immunostimulant candidate against shrimp disease. The method used in this research is descriptive explorative and experimental method. This research was conducted with several stages of squid ink extraction until it becomes powder. Identification of squid ink extract powder is using FTIR and LC-MS test. The results showed that the squid ink extract powder contained alkaloid and carboxylic acid from the FTIR test results. Based on LC-MS test results, it was found that squid ink extract powder contained betaine, cinnamic acid, and choline compounds with large amounts of content. Betaine, cinnamic acid, and choline have several biological activities as antibacterial, antioxidant, antiviral, antifungal, etc. so that it can be used as an immunostimulant against shrimp disease.