Peringkat Akreditasi: A
Nomor Akreditasi: 78/Akred-LIPI/P2MBI/5/2007
Editorial Board: Zainal Arifin (Chief Editor), Augy Syahailatua, Anugerah Nontji, Subagjo Soemodihardjo, Abdul Gani Ilahude. Technical Assistant: Rahmadani Ningsih Maha, Siti Kania Kushadiani, J. Mulawardana.
Editorial Address: Research Center for Oceanography, Indonesian Institute of Sciences (LIPI), Jl. Pasir Putih I, Ancol Timur, Jakarta 14430, Phone: +62-21-64713850., Fax: +62-21-64711984., Email: mri@oseanografi.lipi.go.id
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Content
Experiment on Fission Stimulation of Holothuria Arta (Holothuroidea, Echinodermata): Changing in Body Weight and Morphology
Pradina Purwati and Sigit A. P. Dwiono
Abstract
Experiment on Holothuria atra provided evidence that asexual reproduction by fission was possible to be stimulated at laboratory. The success of the experiment was determined based on the high survival of stimulated individuals that grew into intact. After being tightened, induced individuals divided into anterior- and posterior-end individuals. During regenerating into intact individuals, the body weight decreased to relatively minimun weight. Developing of new tentacles in posterior-end individuals and anal aperture in anterior-end individuals required 7-8 weeks after fission. These indicators may lead to anatomical recovery which may be a sign of feeding necessity.
Keywords: Holothruria atra, Induced fission, Fresh weight, Morphology
Size, Sex and Length at Maturity of Four Common Sharks Caught From Western Indonesia
Fahmi and Kurnaen Sumadhiharga
Abstract
A study on four common shark species in Indonesia, the spinner shark Carcharhinus brevipinna (Muller and Henle, 1839), silky shark Carcharhinus falciformis (Bibron, 1839), spot-tail shark Carcharhinus sorrah (Valenciennes, 1839) and scalloped hammerhead Sphyrna lewini (Griffith and Smith, 1834) was conducted at several shark landing sites in western Indonesia from March 2002 to December 2004. Data were collected from the surveyed areas including the length of frequency, sex composition and length at maturity. In general, they were caught at size smaller than their maturity size. The proportion of immature C. brevipinna, C. falciformis, C. sorrah and S. lewini to their total number recorded at the surveyed area during the study were about 87%, 50%, 80% and 65%, respectively. According to the length at maturity, females generally attained their maturity in larger size than males. Some factors contributing the catches in immature size and conservation status of those four species were also discussed.
Keywords: Shark, Size composition, Western Indonesia
The Extended Longevity of a Small Coral Reef Serranid; a Lesson from Cephalopholis Cyanostigma (Blue Spot Rock Cod) of the Central Great Barrier Reef, Australia
Jacobus W. Mosse and Campbell R. Davies
Abstract
The blue spot rock cod, Cephalopholis cyanostigma, is a small common coral reef serranid that forms a significant proportion of the discarded by-catch in the Great Barrier line fishery. Samples were obtained by spear and line fishing at Orpheus Island (range 114– 294 mm FL, mean = 226 mm, n = 137) and from Pelorus Island (range 120-285 mm FL, mean = 214 mm, n = 125). Sagittal otoliths were used to obtain age-based parameter estimates for the populations at each island. Analysis of marginal increments on monthly samples suggested that a single opaque band was deposited annually during November – December. Recaptures of three fishes (9, 18, and 24 years old) in July and November 1997, five years after injection of oxytetracycline, further corroborated our conclusion that band formation was annual. The maximum age in our samples of 31 years suggested that the blue spotted rock cod was one of the longest lived serranids documented to date. The von Bertalanffy growth function provided the best description of the pattern of growth for populations at both islands with high coefficients of determination (R2 = 0.86 and 0.82 for Orpheus and Pelorus islands, respectively). Female population of both sites grew relatively slow, not reaching asymptotic size until 7-10 yrs. Statistical comparisons on male and female growth patterns were not significant, however. There were significant differences in growth parameters between islands with C. cyanostigma on average growing larger at Orpheus Island (L∞ = 258 mm and K = 0.22) compared with Pelorus Island (L∞ =244 mm and K = 0.25). These age-based population parameter estimates indicated that C. cyanostigma was considerably longer lived than expected for a small coral reef serranid and further demonstrated the utility of age-based methods in studies of the demography of tropical reef fish. The implication for conservation and fisheries management of small tropical serranids is that species with similar population parameters are likely to sustain much lower levels of fishing mortality than previously thought.
Keywords: Cephalopholis cyanostigma (Serranidae), Growth, Longevity, Otolith, Validation
Eurypegasus Draconis Linnaeus, 1766 (Gasterosteiformes: Pegasidae); a New Record to the Derawan Islands, Indonesia
Teguh Peristiwady
Abstract
Three specimens of Eurypegasus draconis Linnaeus, 1766 were collected in seagrass beds of Samama Island, East Kalimantan, in June 2006. It was the first record of this uncommon species that widely distributes in Indian and Pacific waters. The species was characterized by 8-9 tail rings and a spine on the dorsal side of last tail ring.
Keywords: Eurypegasus draconis, Gasterosteiformes, Pegasidae, Seamoths, Derawan Island.
Patterns of Relative Growth in Tropical Neritids, Nerita Undata, Based on Operculum Analysis
Prulley A. Uneputty
Abstract
Growth is one of the important events in the life history of an organism beside reproduction. The objective of the present study was to evaluate the possibility of using the operculum to determine the growth pattern of tropical neritids (Nerita undata). Shell and operculum dimension were measured using a vernier caliper to the nearest 0.01mm. The results showed that there was a relationship between operculum dimensions (length and width) and shell, and it was also shown allometric growth pattern. The study also indicated the relationship between operculum dimension and the shell parameters.
Keywords: Operculum, Shell, Allometric
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