The existence of eels in a freshwater area is influenced by various factors, one of which is the availability of habitats that are suitable for the life of eels. East Nusa Tenggara Province is an archipelago that is mentioned as one of the distribution areas for eel in Indonesia. However, the type and size of eel is strongly influenced by the distance it finds. The farther the river is from the estuary, the larger the size of the eel and the different types. As eurihaline migratory fish, eels can swim far upstream to find a suitable habitat for their life. This study aims to analyze the relationship between location distance and the size and dominance index of eel in freshwater in East Nusa Tenggara (NTT). This research was conducted from October to April. The results obtained are that the three rivers in East Nusa Tenggara province, namely the Tarus river in Kupang district, the Oetona river in Kupang city and the Kamaifui river in Alor district, managed to catch 71 eels at a fishing distance of 0.69 km to 7.86 km. from the mouth of the river. Based on the ano-dorsal analysis, two types of eel caught in the Tarus and Kamaifui rivers were identified, namely Anguilla marmorata and Anguilla nebulosa nebulosa, while in the Oetona river only A. marmorata was found. Based on the calculation of the dominance index, the most dominant species in fresh waters of NTT is A. marmorata.

This study is conducted in Oebelo waters, Central Kupang Sub-district from October to December, 2013. It aims to find out the fishing power of trap (ID: bubu) in different types toward mangrove crab catch. It uses observation method by experimental fishing for one month. The findings show that the caught crab consists of 6 species, i.e. Scylla serrata, S. transquabarica, S. olivacea, Portunus pelagicus, Charybdis granulata and C. anisodon which six of these species are caught in every trap type. The caught crab species with the highest proportion is Scylla serrata by 60 crabs (58.823%), then followed by the other species. Trap type having the highest abundance rate is conical type code B 2.3, then conical type code B 3.2 and followed by the other types. Trap code B 2.3 and B 3.2 is the trap prototype having the higher fishing power compared to the others. Trap having the highest CPUE value is conical shape type code B 3.2, followed by semicircular shape code C 3.2, cube-shaped type code A 2.2 and the other types. Trap engineering in this observed crab 80 fishing is one of the important information to improve the trap construction design and mangrove crab fishing method by utilizing trap in the future.

Changes in temperature, salinity water associated with growth and carrageenan content. Temperature and salinity determines the performance of seaweeds, and indeed all organisms, at the fundamental levels of enzymatic processes and metabolic function. Carrageenan is extracted from the Rhodophyceae. In this study described the ways in which changes in the environment directly affect seaweeds. We consider the extent to which seaweed may be able to respond to changes temperature and salinity. By prioritizing research in sea water we can rapidly build upon understanding of seaweed to climate change to more effectively conserve and manage coastal ecosystems. This research has been carried out from February to December. This study aimed to determine the effect of temperature and salinity on growth, nutrition and carrageenan content. The specific growth rate was 6.25% day-1 at 290C, 5.19% day-1 at 300C, 4.6% day-1 at 310C, 3.6% day-1 at 330C, 2.08%day-1 at 340C, and 1.9% day-1 at 350C, respectively. We concluded that the productivity decreased as both temperature and salinity increased. It was also observed that ice-ice disease was not present at the temperature of 29 to 32 0C and salinity from 30 to 31 psu, while ice-ice was present at temperature 33 to 35 0C and salinity of 34 to 35 psu. Carrageenan content ( 41.87% − 65.43% ) at temperature of 29 0C – 310C, salinity 30–31 psu on March to June while at temperature 32 0C-35 0C, salinity 33–35 ppt: on July to October 7.27% − 25.20%.