REVIEW: Current Status of Extenders and Cryoprotectants on Fish Spermatozoa Cryopreservation

An important component of many studies of cryopreservation of fish spermatozoa is the type of extenders and cryoprotectants. The suitability of extenders and cryoprotectants differs from one fish to another. There are many studies have been done in cryopreservation of fish spermatozoa. However, there are few review have been done. This review reveals some aspects of cryopreservation especially the role of extender and cryoprotectant in fish sperm cryopreservation. Fish produce high viscosity of sperm and in some cases only small volume is produced. Before cryopreserved in liquid nitrogen, sperm have to dilute with extenders and for long-term cryopreservation, cryoprotectants are needed to protect the sperm cell from cold and hot shock treatments and prevent cell dehydration during pre-freezing, freezing and post thawed. The suitability of extenders and cryoprotectants differs from one fish to another. Over the last decade, studies on the cryopreservation of mammalian sperm, animal husbandry sperm and human sperm have progressed significantly but studies on fish sperm is still confined to some aquatic

Studi Pendahuluan Kualitas Air Untuk Pengembangan Budidaya Perikanan di Kecamatan Sampoinit Aceh Jaya Pasca Tsunami

The preliminary study of water quality assessment for developing aquaculture effortwas done in Sampoinit sub district for one week (1-8 December 2007). The objective of the presentstudy is to evaluate the suitability of sites for developing of aquaculture. The explorative surveymethod was used in this study by determine of several sampling points at identified sites. Thesurvey was covered four villages i.e. Meunasah Kulam, Crak Mong, Krueng No dan Pulo Raya. Theresults show that Meunasah Kulam, Crak Mong, Krueng No dan Pulo Raya were suitable forbrackish water aquaculture of Scylla serrata, Mugil sp, Tilapia mossambica), Tilapia nilotica andChannos channos, while Crak Mong was suitable for freshwater aquaculture of Clarias batrachusand Channa striata. A semi intensive of aquaculture was suitable to be developed

Studi Pendahuluan Kualitas Air Untuk Pengembangan Budidaya Perikanan di Kecamatan Sampoinit Aceh Jaya Pasca Tsunami

The preliminary study of water quality assessment for developing aquaculture effort was done in Sampoinit sub district for one week (1-8 December 2007). The objective of the present study is to evaluate the suitability of sites for developing of aquaculture. The explorative survey method was used in this study by determine of several sampling points at identified sites. The survey was covered four villages i.e. Meunasah Kulam, Crak Mong, Krueng No dan Pulo Raya. The results show that Meunasah Kulam, Crak Mong, Krueng No dan Pulo Raya were suitable for brackish water aquaculture of Scylla serrata, Mugil sp, Tilapia mossambica), Tilapia nilotica and Channos channos, while Crak Mong was suitable for freshwater aquaculture of Clarias batrachus and Channa striata. A semi intensive of aquaculture was suitable to be developed

Studi Pendahuluan Kualitas Air Untuk Pengembangan Budidaya Perikanan di Kecamatan Sampoinit Aceh Jaya Pasca Tsunami

The preliminary study of water quality assessment for developing aquaculture effortwas done in Sampoinit sub district for one week (1-8 December 2007). The objective of the presentstudy is to evaluate the suitability of sites for developing of aquaculture. The explorative surveymethod was used in this study by determine of several sampling points at identified sites. Thesurvey was covered four villages i.e. Meunasah Kulam, Crak Mong, Krueng No dan Pulo Raya. Theresults show that Meunasah Kulam, Crak Mong, Krueng No dan Pulo Raya were suitable forbrackish water aquaculture of Scylla serrata, Mugil sp, Tilapia mossambica), Tilapia nilotica andChannos channos, while Crak Mong was suitable for freshwater aquaculture of Clarias batrachusand Channa striata. A semi intensive of aquaculture was suitable to be developed

Factors Affect Gonadal Development And Egg Quality Of Female Broodfish: A Review

Keywords: Gonadal Development, Egg Quality, Female Broodfis

Estimation of production trend of the depik, Rasbora tawarensis (Teleostei, Cyprinidae), in Lake Laut Tawar, Indonesia

The objective of the present study was to evaluate the production trend of the depik (Rasbora tawarensis) during the last two decades in Lake Laut Tawar. The production trend was examined based on the catch per unit efforts. The direct sampling, fishermen catches collection and fishermen interview were conducted to collect actual fish catches. The results showed that the depik, R. tawarensis production (indicated by the catch-per-unit effort (CPUE)) was seasonally dependent where the CPUE was higher in the rainy season compared to dry season. In addition, the CPUE was higher in the new moon according to lunar cycle. The production of depik in particular and fishes of Lake Laut Tawar in general are declining dramatically during the last two decades. The decrease in the water levels, destructive fishing gears, the presence of introduced species and pollution are the main reasons suggested for this phenomenon.</p

Remote sensing and field assessment of tsunami effects on coastal pond aquaculture in northern Sumatra

An attempt was made to conduct spatial assessment of the pattern and extent of damage to coastal aquaculture ponds along the east coast of Aceh province in Sumatra, Indonesia, resulting from the tsunami event of 26 December 2004. High-resolution satellite imagery, i.e., SPOT-5 multispectral scenes covering the 700 km stretch of the coast, acquired before and after the tsunami, were digitally enhanced and visually interpreted to delineate pockets of aquaculture ponds that were discerned to be damaged and relatively intact. Field checks were conducted at 87 sites in the four eastern coastal districts. The results indicate that SPOT-5 multispectral imagery was minimally sufficient to detect areas of damaged and relatively intact aquaculture ponds, but the 10-m spatial resolution poses limitations to evaluating the extent of pond damage. Nevertheless, the 60 km swath of the imagery makes it reasonably affordable for large-area assessment to identify pockets of severe damage for targeting more detailed assessments. The image maps produced from a mosaic of the SPOT-5 scenes can also serve as base maps for spatial planning in the challenging task of reconstruction and rehabilitation of the disrupted livelihoods of the coastal communities.Remote sensing, Disasters, Spatial analysis, Coastal zone, ISEW, Indonesia, Aceh,

Remote Sensing and Field Assessment of Tsunami Effects on Coastal Pond Aquaculture in Northern Sumatra

An attempt was made to conduct spatial assessment of the pattern and extent of damage to coastal aquaculture ponds along the east coast of Aceh province in Sumatra, Indonesia, resulting from the tsunami event of 26 December 2004. High-resolution satellite imagery, i.e., SPOT-5 multispectral scenes covering the 700 km stretch of the coast, acquired before and after the tsunami, were digitally enhanced and visually interpreted to delineate pockets of aquaculture ponds that were discerned to be damaged and relatively intact. Field checks were conducted at 87 sites in the four eastern coastal districts. The results indicate that SPOT-5 multispectral imagery was minimally sufficient to detect areas of damaged and relatively intact aquaculture ponds, but the 10-m spatial resolution poses limitations to evaluating the extent of pond damage. Nevertheless, the 60 km swath of the imagery makes it reasonably affordable for large-area assessment to identify pockets of severe damage for targeting more detailed assessments. The image maps produced from a mosaic of the SPOT-5 scenes can also serve as base maps for spatial planning in the challenging task of reconstruction and rehabilitation of the disrupted livelihoods of the coastal communities

Preliminary study on the natural extenders for artificial breeding of African catfish Clarias gariepinus (Burchell, 1822)

The objective of the present study was to determine the most suitable extender and their respective dilution ratios for African catfish sperm for artificial induced breeding and cryopreservation purposes. Three natural extenders were tested i.e. coconut water, sugarcane water and soybean solutions, at three different levels of sperm to extender dilutions of 1:20, 1:30 and 1:40. While Ringer solution was used as a control Diluted sperm were fertilized with ready isolated eggs to assess the fertility and hatching rate at 0, 6 and 12 hour intervals. The results showed that the eggs hatched approximately 19 to 27 hours after fertilization. In general, the fertilization and hatching rates decreased with increasing dilution ratio. With respect to natural extenders, the coconut water showed the highest fertility and hatching rates at 1:20 dilution ratio. Therefore, coconut water at 1:20 dilution ratio was the optimal condition for African catfish spermatozoa among the natural extenders investigated