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As from January 2010 The Israeli Journal of Aquaculture-Bamidgeh (IJA) will be published exclusively as an on-line Open Access (OA) quarterly accessible by all AquacultureHub (http://www.aquaculturehub.org) members and registered individuals and institutions. Please visit our website (http://siamb.org.il) for free registration form, further information and instructions. This transformation from a subscription printed version to an on-line OA journal, aims at supporting the concept that scientific peer-reviewed publications should be made available to all, including those with limited resources. The OA IJA does not enforce author or subscription fees and will endeavor to obtain alternative sources of income to support this policy for as long as possible.

Fish mortality due to outbreak and to the decrease in the quality of the environment is a latent problem increasingly complex in Indonesia. Extreme weather conditions with high rainfall intensity, reacute actually bring back several opportunistic pathogens of diseases such as Motile Aeromonads Septicemia. Various cases of mass fish deaths re-emerged, especially in public waters such as Maninjau Lake and Cirata reservoir is the sign of the decline in the quality and carrying capacity of the environment and it is suspected to be the main cause of the case. Over the past four years, fish mortality in public water has been regularly recorded and a peak of massive fish mortality occurred in 2016. A total of 4,725 tons of dead fish occurred which is estimated around 0.95 percent of the total production of freshwater net cages cultivation nationally. This amount is estimated to cost economic losses up to IRD 47.25 billion equivalent to 3.3 million US$ (assuming the price of fish is IDR 10,000/0.71US$ per kg). The occurrence of mass mortality of fish from net cages may reduce the aquaculture production originating from public waters up to 23.5 percent. Furthermore, risk of a new cross- border disease such as Acute Hepatopancreatic Necrosis Disease (AHPND); White Fecal Syndrome (WFS); Enterozytozoon hepatopenaei (EHP) and Tilapia Lake Virus (TiLV) heavily threaten aquaculture businesses. There is a need for cross-sectoral and even cross-country collaborative efforts, especially in anticipating the spread of cross-border fish diseases. This condition requires commitment and awareness from all stakeholders involved. Therefore, in order to promote sustainable aquaculture production, a national aquatic animal health (NAAH) strategy was formulated and will assist Indonesia government to: improve the national fish health services skills, make aware fish farmers undertaking responsible fish health management and to improve their capacity on emergency responses and contingency planning against diseases, reduce of important fish diseases and the use of chemicals in aquaculture, and prevent introduction of exotic disease. The implementation of the NAAH strategy needs guidance, support and full commitment from the government. The Ministry of Marine Affairs and Fisheries through Directorate General of Aquaculture is the competent authorities who will share responsibilities in the implementation of NAAH strategy.

This study aimed to identify pathological agent and determine the impact of water quality during climate transitions on mass mortalities of neon tetra (Paracheirodon innesi) in the West Java region of Indonesia. Ten thousand fishes reported died each day during the seasonal. Samples of 10 fish/tank were taken and tested for parasites, fungal, and bacteria. The investigations tests showed that the primary disease was caused by parasite from protozoa Pleistophora spp. (Microsporidia). It was confirmed by taxonomic descriptions and histopathological diagnosis. This parasite causes histozoic infection. Fungus was not detected, and bacteria were identified as Aeromonas sp. and Pseudomonas sp.. The water temperature fluctuation was recorded higher than 7°C between daylight and night. Mortality was recorded in every size of fish. The clinical signs of fish on the outbreak were pale body, discoloration of the lateral line, the appearance of white patches under the skin, lethargy, swimming disorder, and losing weight. The recommendations due to the outbreaks were total eradication for infected fish populations, separating newly arrived fish (quarantine) at least 2 weeks, maintaining water quality in the optimal range, and proper cleaning (sanitizing) must be performed.

<p>Micotic diseases caused by aquatic fungi is often found in gouramy fish (<em>Osphronemus goramy</em> Lac.) at various stages from egg hatching to adult. Samples of fungi were isolated and identified from eggs and fish indicated with fungal diseases infection. <em>Saprolegnia</em> was identified in infected egg whereas <em>Aphanomyces </em>sp. was identified in the internal part (underneath lesion) of gouramy fish. Postulate Koch tests was further confirmed that both species could infect gouramy fish.    </p> <p>Keyword : Gouramy, fungi, <em>Saprolegnia</em> and <em>Aphanomyces</em></p> <p> </p> <p>ABSTRAK</p> <p>Penyakit mikotik yang disebabkan oleh cendawan akuatik sering ditemui pada ikan gurame (<em>Osphronemus goramy</em> Lac.) dari fase penetasan telur sampai ukuran dewasa. Dari isolasi dan identifikasi yang dilakukan terhadap telur yang terinfeksi dan permukaan tukak diperoleh cendawan <em>Saprolegnia</em>, sedangkan isolasi dan dan identifikasi dari bagian internal (dibawah tukak) ikan gurame diperoleh cendawan <em>Aphanomyces </em>sp. Dari uji reinfeksi dengan menggunakan Postulat Koch diperoleh hasil bahwa cendawan <em>Saprolegnia </em>yang diisolasi dari telur gurame maupun cendawa cendawan <em>Aphanomyces</em> dari tukak dapat menginfeksi ikan gurame.</p> <p>Kata kunci : gurame, cendawan, <em>Saprolegnia</em> dan<em> Aphanomyces</em></p>