| Penulis | Artikel | Abstrak |
|---|---|---|
| Suharsono and Giyanto | A Formulation Approach to Quantify the Abundance of Coral Genera | A formulation approach to quantify the abundance of coral genera is considered important to obtain basic information necessary in determining the potency and condition of coral, and one application can also be used to set quota for coral trade. The line intercept method has been used in five different area throughout Indonesian archipelago representing prestine area to heavy disturbances. Based on the number of occurance, the genera dominance, the size of colony and the coral coverage in each study area was assigned scale, weight and value. The calculation gave the range of Total Value (TV) froms 5-20 and the assignment abundance category of coral genera is 17-20 very common. 14-16 common, 11-13 uncommon, 8-10 rare, and 5-7 very rare. The catagorization of each coral genus of certain area can be used to consider whether it can be harvested or not. Suggestion based on this study as follow: coral genera catagorized as “very common” can be harvest, coral genera catagorized as “common” can be harvest with caution, coral genera catagorized “uncommon”, harvest are limited, coral genera as “rare”, harvest are strictly limited and coral genera as “very rare” are prohibited to harvest. |
| L.M.G. Panggabean, S.A.P. Dwiono, D.E. Djoko Setyono | Growth of Juvenile Horse Hoof Clams (Hippopus hippopus) Reared in Coastal Waters, Pari Island, Kepulauan Seribu | The main purpose of this present study is to determine the growth and survival rate of juvenile horse's hoof clams (Hippopus hippopus) and to find out a suitable site for their rearing in nature. Juveniles used in this study were about 3 years old, produced in the hatchery of CV Dinar, Bali. They were reared in the cages, placed on the sea bed at several sites, namely: (1) on the reef flat, (2) on the bed of a lagoon, and (3) on the sea channel. After 360days of rearing, the highest daily growth was found for juveniles reared in site-2, i.e. 0.110 mm in length, 0.080 mm in width and 0.091 mm in height. These values were significantly different from other two sites. The survival rate after 360 days of rearing was 85.5% in site-1, 99.4% in site-2 and 96.8% in site-3. Based on these results the bed of a lagoon is the best and suitable site to grow horse's hoof clam juveniles in nature. Water condition at this site is relatively calm with sandy-muddy substrates and relatively dense seagrasses, mainly Thallasia spp. |
| M. Litaay | Occurence and Distribution of Mollusca Family Trhocidae at Badi Island SW-Sulawesi Indonesia | The occurrence and distribution of family trochidae at Badi Island, Spermonde Archipelago off SW-Sulawesi has been studied. The line transect with combination of quadrant method was used during sampling. A transect covering 400 m2 of sampling area was applied at 1, 3, 5, and 7 m depth, respectively. Parameters such as shell length and size-class distribution were observed. Ecological parameters were also recorded during investigation. We found the presence of 11 species of trochidae at the study area. It was evident that some trochidae were common and while top shell Trochus niloticus seems to be rare. Vertical distribution among this group was uneven. The number of species decreases with increasing depth. Furthermore, high density of smaller trocha occurred at shallow water followed by a decline with changes in depth. |
| J.W. Mosse and B.G. Hutubessy | Demersal Fishing Analysis of Kupang Bay | Study on demersal fish in Kupang bay was carried for 6 months, from July 2002 to December 2002. Sampling was conducted twice a month at the ten-selected locations within the bay using different fishing gears such as gill net, bottom logline, hand line and traps. Fishes caught were stored in a icebox and transferred to the laboratory of the Fisheries Faculty of Artha Wacana Christian University, Kupang for further identification. Similarity index of fish species of the study sites was analyzed using non-metric multidimensional scaling (nMDS) of the matrix Bray Curtis similarity. A computer program PRIMER was used to perform the analysis. The result shows that there are 56 species (total catch 890 fishes) found during this study and their similarity index revealed three groups of study sites. Interestingly, it seems that these species remained to have some strong association with the existing ecosystem. |
| S.A.P. Dwiono and D.E.D. Setyono | Growth of Juvenile Green Snail (Turbo marmoratus) Cultured in Cages Placed at Different Depths | This research was part of successive studies on culture techniques of juvenile green snail (Turbo marmoratus). This study was carried out for 14 weeks in coastal waters of Morella, Ambon Island. Three cages were placed at depths of 0 m, 4 m and 8 m below mean sea level. Each cage had a bottom area of 0.81 m2 and was stocked with 20 green snail juveniles of 40-50 mm shell diameter. During the first 4 weeks, juveniles reared at 0 m deep showed lowest instantaneous growth, while those reared at 8 m deep attained highest instantaneous growth. The instantaneous growth decreased significantly over 6 weeks for juveniles reared at 4 m and 8 m deeps. Over 14 weeks, juveniles reared at 8 m deep had higher daily growth than those at 0 m deep. It is recommended that to grow green snail juveniles at 8 m deep without any food complement, the substrates (coral rubbles) in the cages need to be renewed every 4 weeks with ones covered with microalgae. |
| A. Syahailatua | Marine Biodiversity of Indonesia; Larval Fish Perspective | Marine life of Indonesia is very well known as a high diversity according to Ekman’s hyphothesis. However, from the larva fish perspectives, this hypothesis seems to be rejected according to the comparative results of larval fish studies during the Snellius Expedition (1984-1985) in Banda Sea and the larval fish observation related to the East Australian Current (1998-1999) off New South Wales coast in Australian waters. Larval fish diversity from some previous studies over the world is also included. Several suggestions are also recommended to enhance our knowledge in marine biodiversity including improvement in marine biodiversity observation such as, research programs, field and laboratory facilities and numbers of taxonomists, and also collaborative works among research institutes, universities, and non-governmental organizations. |
Penulis : Suharsono, Giyanto, LMG Panggabean, SAP Dwiono, DE Djoko Setyono, M Litaay, JW Mosse, BG Hutubessy, SAP Dwiono, DED Setyono, A Syahailatua
Dewan redaksi : Zainal Arifin (Chief Editor), Augy Syahailatua, Anugrah Nontji, Subagjo Soemodihardjo, Abdul Gani Ilahude.
ISSN : 0079-0435
Tahun Penerbitan : 2006
Penerbit : LIPI PRESS
