MORPHOREGRESSION AND FIRST SIZE AT MATURITY OF GOLDSTRIPE SARDINELLA (SARDINELLA GIBBOSA) FROM BALI STRAIT WATERS

Bali Strait was one of the highest density areas for small pelagic fish in Indonesian Fisheries Management Area (FMA)-573 with goldstripe sardinella (Sardinella gibbosa) as was one of the abundant species in the catch. The aims of this study were to reveal the morphoregression characteristics and the first size of maturity for Sardinella gibbosa in Bali Strait waters. A total of 1.282 goldstripe sardinella were measured in total length (TL), fork length (FL), and standard length (SL)) and weighed during the study. All of the length measurement methods were highly related to the weight, which were W = 4 x 10-6 TL3,1686 (R² = 0,9817); W = 4 x 10-6 FL3,2334 (R² = 0,9732); and W = 1 x 10-5 SL3,0239 (R² = 0,9656), respectively. Among all the measurement methods, total length estimated the weight more accurately than the others. The growth pattern of goldstripe sardinella in this study were various based on the measurement method, sex, and the maturity level of the fish. A total of 800 individuals were dissected and their gonads examined. The sex was identified by visual characteristics. The size at 50% maturity for goldstripe sardinella in Bali Strait was 148 mm TL for male and 155 mm TL for female. Most of the caught fish were under the size at 50% maturity

KARAKTER MORFOMETRIK DAN MERISTIK IKAN EKOR PEDANG (Xiphophorus helleri Heckel, 1848) DI DANAU BUYAN, BULELENG, BALI

Ikan ekor pedang bukan merupakan ikan asli Indonesia. Ikan ini berasal dari Amerika Tengah dan dilaporkan menyebabkan kerugian di beberapa perairan yang dihuninya. Ikan ekor pedang merupakan ikan kedua yang paling banyak tertangkap di Danau Buyan. Penelitian ini bertujuan untuk mengungkap karakter morfometrik dan meristik, hubungan panjang bobot dan hubungan panjang total-panjang baku pada dua varian ikan ekor pedang di Danau Buyan yang memiliki warna tubuh yang berbeda. Penelitian dilakukan pada bulan Januari sampai April 2018. Ikan yang diamati berjumlah 160 ekor. Pengamatan meliputi pengukuran 12 karakter morfometrik tradisional, 14 karakter truss morphometric, penghitungan empat karakter meristik, dan penimbangan bobot. Panjang total ikan ekor pedang jantan dan betina pada varian I adalah 43,94 - 79,47 mm dan 43,81 - 115,80 mm dengan nilai b= 2,90 dan b= 2,98. Kemudian, panjang total ikan ekor pedang pada varian II adalah 45,76 - 83,91 mm untuk ikan jantan dan 41,43 - 88,49 mm untuk ikan betina dengan nilai b= 2,80 dan b= 3,07. Karakter meristik pada kedua varian ikan ekor pedang baik jantan dan betina adalah D. 12-13 ; A. 8 - 9. Hubungan panjang bobot ikan ekor pedang pada kedua varian menunjukan pertumbuhan isometrik. Berdasarkan pengamatan dalam penelitian ini, diketahui tidak terdapat perbedaan pada dua varian ikan ekor pedang di Danau Buyan.Green swordtail is not originally from Indonesia, but from Central America. This fish was reported harmful in some freshwater ecosystem. Green swordtail was the second most caught fish in Buyan Lake. The aims of this research were to reveal morphometric and meristic characters, length-weight relationship and total length-standard length relationship on two variants of green swordtail with the different color in Buyan Lake. This research was conducted from January to April 2018 in Buyan Lake. The number of measured and weighed fish were 160 individuals. There were 12 traditional morphometric characters, 14 truss morphometric characters, and four meristic characters observed. Respectively, the total length for green swordtail variant I male and female were 43.94 - 79.47 mm and 43.81 - 115.80 mm. The b value for both of the variant I were 2.90 and 2.98. For the variant II, the total length was 45.76 - 83.91 mm for male fish and 41.43 - 88.49 for female. The b value for variant II were 2.80 and 3.07 for male and female respectively. Meristic characters for all variant and sex was D 12 - 13; A 8 - 9. The growth pattern was isometric. There is no difference in the body shape between the variant of green swordtail fish