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NOTES ON FOOD, GROWTH AND REPRODUCTION OF HOMALOPTERA AMPHISQUAMA TA (WEBER and DE BEAUFORT), (BALlTORIDAE) FROM ALAS RIVER, ACEH, SUMATRA ISLAND Mosse, Jacobus W.; Wirjoatmodjo, Soetikno
TREUBIA Vol 31, No 3 (1999): Vol. 31 No. 3, December 1999
Publisher : Research Center for Biology

Approximately 253 specimens of freshwater fish Homalopteraamphisguamata (Weber and de Beaufort) were collected during dry and rainy seasons from the upper reached of Alas river, Sumatra island in 1981-1983. Their food, growth and reproduction were studied. Phytoplanktonic algae, especially Bacillariophyceae and small aquatic insects are their food preference. The growth pattern was different between sex, that is allometric for the male and isometric for the female.Relatively, there is no difference of condition factor between sex (0.850 for the male and 0.848 for the female). However, tnevaiues were different between seasons. The mixed value in average was around 0.934 in rainy season and around 0.775 in dry season. Total fecundity highly varied from 63 up to 470 or 93 in average. The bigger size of the fish tended to show higher fecundity value. The percentage number of matured gonads during the rainy season was 8.89-22.55 % and in dry season was 8.21-18.33%. The diameter of matured eggs was around 2.01 mm in average.

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 Mosse, Jacobus W.; Davies, Campbell R.
Marine Research in Indonesia Vol 32, No 1 (2007)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

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.

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 Mosse, Jacobus W.; Davies, Campbell R.
Marine Research in Indonesia Vol 32 No 1 (2007)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

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.

Parameter Populasi Beberapa Spesies Ikan Karang Di Perairan Kecamatan Seram Timur RUMAGIA, Abdul Gafur; Mosse, Jacobus W.; Ongkers, Ong T. S.
Agrikan: Jurnal Agribisnis Perikanan Vol 12, No 2 (2019)
Publisher : Sangia Research Media and Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29239/j.agrikan.12.2.360-368

Kecamatan Seram Timur Kabupaten Seram Bagian Timur cukup terkenal dengan hasil perikanan tangkap dan salah satunya adalah ikan karang. Penelitian tentang parameter populasi dari ikan karang di Indonesia masing tergolong sedikit sehingga penulis memandang perlu untuk melakukan penelitian ini guna menambah kajian ilmu tentang parameter populasi ikan karang di Indonesia dan di Kabupaten Seram Bagian Timur secara khusus. Pengambilan sampel di Perairan Kecamatan Seram Timur dilakukan selama 8 bulan, sebanyak 622 ekor ikan sampel. Parameter yang dianalisis adalah pola pertumbuhan, parameter pertumbuhan (Lt, L¥, K dan t0), estimasi laju mortalitas (M, F dan Z) dan laju eksploitasi (E). Hasil penelitian menunjukan bahwa sebaran frekuensi panjang dari semua jenis ikan berada pada satu kelompok ukuran panjang, dengan pola pertumbuhan pada semua jenis ikan karang adalah alometrik negative. Nilai L¥ berkisar antara 314.74 mm sampai 460.00 mm dengan nilai koefisien pertumbuhan (K) berkisar antara 0.42 sampai 1.10 per tahun dimana umut t0 berkisar antara – 0.0735 sampai – 0.2530. Laju mortaltas akibat penangkapan (F) pada umumnya lebih rendah dari laju mortalitas alami (M) kecuali pada jenis Lutjanus lentjan yang menyebabkan rata-rata laju ekploitasi (E) masih dibawah 50% sehingga dapat dikatan bahwa ikan-ikan karang diperairan kecamatan Seram Timur masih berada pada kondisi under exploitation

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