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Nasution, Syahroma Husni
Research Center for Biology-Indonesian Institute of Sciences
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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PERTUMBUHAN DAN MORTALITAS IKAN ENDEMIK BUTINI (Glossogobius matanensis Weber, 1913) DI DANAU TOWUTI, SULAWESI SELATAN [Growth and Mortality of Endemic Fish Butini (Glossogobius matanensis Weber,1913) in Lake Towuti, South Sulawesi] Mamangkey, Jefry Jack; Nasution, Syahroma Husni
BERITA BIOLOGI Vol 13, No 1 (2014)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v13i1.651

Abstract

Lake Towuti is the largest lake in the Malili Complex covering the area of 560 km and 203 m in depth. Butini is an endemic and vulnerable fish species that consumed by the local people and have an important economic value. Various activities occured in the lake was thought to be the cause of decreasing fish populations.The objective of this study was to determine the growth and mortality of butini in Lake Towuti.This research was conducted in Lake Towuti for 12 months from Mei 2006 to April 2007.Fish samples obtained by using long lines with various number of hooks i.e. 8,10,12,14,and 16.Each depth (25, 50, 75, 100, 150, and 200 m) launched one long line unit in three zones (A, B, and C).Growth and fish mortality were calculated based on total length frequency data using FiSAT II software. The results showed that the longest size (46.20 cm) was the male found at a depth of -1,200(t-to)150 m in April in Zone C.The combined Von Bertalanffy’s growth pattern was of L(t)= 46,62 [1 - e ]. While the growth pattern for each male -0,950(t-to) -0,820(t-to) and female was L(t) =46,62 [1 - e ] and L(t)= 46,62 [1 - e ] respectively. The highest total mortality was found in Zone B (5.49 per year) occurred in female fish. The highest natural mortality was observed in Zone B (1.80 per year) occurred in male fish.The highest fishing mortality was recorded in zone B (4.08 per year) and found in female fish. The highest exploitation level was found in zone A (E = 0.76) recorded in female fish.Exploitation level of butini stock in Lake Towuti indicated over-fishing (E=0.56) recorded in Zone A.
PIRAMIDA UMUR DAN PENGELOMPOKAN POPULASI IKAN BONTI-BONTI (Paratherina striata) SECARA SPASIAL DI DANAU TOWUTI, SULAWESI SELATAN Nasution, Syahroma Husni
BERITA BIOLOGI Vol 10, No 5 (2011)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1231.623 KB) | DOI: 10.14203/beritabiologi.v10i5.1912

Abstract

Bonti-bonti (Paratherina striata) is an endemiz and vulnerable fish in Lake Towuti and L. Mahalona. The fish population tend to decreasing due to intensive fishing and habitat quality decline. This study was aimed re reveal the age pyramids and the grouping of fish populations as a basis for describing condition and diversty of fish populations. The study was conducted in L.Towuti at five stations. Samples were collected using experimental gillnet with mesh sized ], ¾, 1, dan 1¼ inches. Meansurement of morphometric characters of  fish consist of 22 characters. Results shows that fish population at each station features a different age pyramid. at station inlent of L. Towuti and Loeha Island, the age pyramid type which is dominated by juveniles a reletively rapid population growth. At station Cape Bakara, outlet of lake Towuti and Beau, the age pyramid type tend to be mederate. This shows the fish population is dominated by medium-size, fish populations in stable condition. Obtained 12 characters that have a strong correlation values. ANCOVA test results showed no difference in morphometric characters between the stations in male and female. Based on ANCOVA test assumed that the Bonti-Bonti at fish station is a population group.  
Co-Authors Jefry Jack Mamangkey