Sex ratio and first maturity size of matano ricefish (Oryzias matanensis Aurich, 1935) at Lake Towuti, South Sulawesi, Indonesia

Abstrak Salah satu potensi perikanan laut adalah rajungan (Portunus pelagicus). Rajungan (Portunus pelagicus) merupakan komoditas yang penting karena mempunyai nilai ekonomi tinggi dan permintaan pasar baik di dalam maupun luar negeri masih tinggi. Tujuan dilaksanakan praktik integrasi ini adalah untuk Menganalisis beberapa aspek biologi untuk mengetahui pola pertumbuhan sebagai acuan kajian stok rajungan di Pesisir Kabupaten Lampung Timur, Provinsi Lampung dan Mengetahui aspek perikanan di Pesisir Kabupaten Lampung Timur, Provinsi Lampung. Metode yang digunakan dalam penelitian ini adalah metode penelitian deskriptif. Pengambilan data praktik meliputi penentuan hubungan lebar bobot karapas, nisbah kelamin, tingkat kematangan gonad, ukuran pertama kali tertangkap dan ukuran pertama kali matang gonad. Hasil praktik menunjukkan rajungan yang ada di pesisir Kabupaten Lampung Timur diperoleh dari hasil pengukuran sampel lebar-bobot rajungan sebanyak 1013 spesies dengan pola pertumbuhan alometrik negatif. Hasil nisbah kelamin P. pelagicus memperlihatkan bahwa 544 rajungan jantan (54%) dan 469 rajungan betina (46%) memiliki sex ratio 1:0.862. Persentase Tingkat kematangan gonad jantan (46%) dan betina (54%). Ukuran morfometrik nilai standar length at first maturity (Lm) yaitu 12.48 cm. Dari hasil perhitungan diperoleh nilai Lc Total sebesar 13.23 cm. Rajungan di Pesisir Kabupaten Lampung Timur biasanya ditangkap menggunakan alat tangkap Jaring Rajungan dan Bubu.Kata Kunci : Rajungan; Lampung Timur, Alat Tangkap

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REPRODUCTIVE ASPECTS OF SCALLOPED PERCHLET, Ambassis nalua (HAMILTON, 1822) IN PABEAN BAY INDRAMAYU, WEST JAVA

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.28930/jitkt.v9i1.17921 ◽

2017 ◽

Vol 9 (1) ◽

pp. 113

Author(s):

Nisha Desfi Arianti ◽

M.F. Rahardjo ◽

Ahmad Zahid

Keyword(s):

Sex Ratio ◽

Sampling Period ◽

Spawning Season ◽

West Java ◽

Fish Samples ◽

Length Range ◽

Males And Females ◽

Mature Fish ◽

First Maturity ◽

Somatic Index

ABSTRACTScalloped perchlet, Ambassis nalua, is one of fishes in Pabean Bay, Indramayu. This research aims to determine the reproductive aspects of Ambassis nalua in Pabean Bay Indramayu including sex ratio, spawning season, first maturity, fecundity and spawning pattern. Fish samples were collected by trap net and trammel net at three sites in Pabean Bay from April to October 2015. A total of 424 of A. nalua were caught, consist of 114 males and 310 females; with total length ranged from 38.04 to 112.63 mm and total weight ranged from 0.37 to 25.44 g. Sex ratio of mature fish was 1:1.9. The mature males and females were found in every month of sampling period. The gonado-somatic index (GSI) ranged from 0.40 to 0.83 and 2.36 to 4.54 for male and female, respectively. The peak of spawning season was found in September. The first maturity (Lm50) for male and female were 79.17 mm and 91.25 mm, respectively. The fecundity varied from 3,451–32,465 eggs. Egg diameter distribution shows that spawning pattern of A. nalua was batch spawner. Keywords: Ambassis nalua, spawning season, sex ratio, reproduction

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ASPEK BIOLOGI DAN MUSIM PENANGKAPAN LOBSTER (Panulirus spp) DI PERAIRAN KUPANG NUSA TENGGARA TIMUR

Jurnal Penelitian Perikanan Indonesia ◽

10.15578/jppi.23.3.2017.167-180 ◽

2018 ◽

Vol 23 (3) ◽

pp. 167

Author(s):

Setiya Triharyuni ◽

Ngurah N Wiadnyana

Keyword(s):

Sex Ratio ◽

Rainy Season ◽

Spiny Lobster ◽

Foreign Market ◽

Market Demand ◽

Total Catch ◽

Fishing Season ◽

Catch Data ◽

Lobster Fishery ◽

First Maturity

Lobster merupakan komoditas perikanan andalan yang banyak dieksploitasi di perairan Kupang untuk memenuhi permintaan pasar dalam dan luar negeri. Hal ini menyebabkan kegiatan penangkapan lobster berlangsung sangat intensif. Penelitian ini bertujuan untuk menganalisis aspek biologi dan musim penangkapan lobster. Data dan informasi yang dikumpulkan meliputi ukuran panjang karapas dan berat serta jenis kelamin tiap-tiap jenis lobster yang tertangkap serta hasil tangkapan dan upaya yang dilakukan secara bulanan. Data tangkapan lobster yang dianalisis dicatat selama periode Oktober 2015 - Desember 2016. Hasil penelitian menunjukkan bahwa terdapat empat jenis lobster dari kelompok Palinuridae, yaitu lobster bambu (P. versicolor), lobster batu (P. penicillatus), lobster pasir (P. homarus) dan lobster mutiara (Panulirus ornatus). Berdasarkan jumlah individu, tangkapan lobster bambu mendominasi yaitu sekitar 60 % dari tangkapan total. Secara umum ukuran dari semua jenis lobster sesuai dengan ketentuan yang diatur dalam peraturan perundang undangan. Nisbah kelamin yang seimbang dan ukuran rata-rata pertama kali tertangkap lebih besar dari setengah panjang infinitif dan panjang pertama matang gonad menunjukkan bahwa sumber daya lobster masih layak untuk dieksploitasi. Musim penangkapan losbter di wilayah Kupang ini secara umum terjadi pada periode musim penghujan yang mulai dari September sampai Februari. Pembinaan kepada nelayan perlu ditingkatkan agar nelayan tetap patuh pada peraturan perundangan yang berlaku, bahkan dapat diikuti dengan nelayan di wilayah lainnya. Lobster fishery commodity in Kupang. Many lobsters are exploited in these waters to meet domestic and foreign market demand. This led to lobster fishing activities very intensive. The research on lobster resources was conducted to analyze the biology aspect and lobster fishing season. Data included, length of the carapace, individual weight, sex of lobsters and the monthly catches and efforts. The lobster catch data analyzed were recorded during the period of October 2015 - December 2016. The results show that there were four species of lobster from the Palinuridae group,i.e:the ornate spiny lobster (Panulirus ornatus), pronghorn spiny lobster (P. penicillatus), scalloped spiny lobster (P. homarus) and painted spiny lobster (P. versicolor). The catch was dominated by P. versicolor with 60% of the total catch. Generally the size of all lobster species with the regulation concerning the lobster fishing. The balance of sex ratio and the size of Lc of more than 0,5 of Land more than length at first maturity indicates that the lobster resource in Kupang and surrounding waters is still exploited. The losbter fishing season is generally in the rainy season period from September to february. The increase of guidance to fishermen is needed to keep the fishermen the law and regulations, even can be followed by fishermen in other areas.

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BIOLOGI REPRODUKSI IKAN BETOK (Anabas testudineus) DI PAPARAN BANJIRAN LUBUK LAMPAM,KABUPATEN OGAN KOMERING ILIR

BAWAL Widya Riset Perikanan Tangkap ◽

10.15578/bawal.6.3.2014.137-146 ◽

2015 ◽

Vol 6 (3) ◽

pp. 137

Author(s):

Eko Prianto ◽

Mohammad Mukhlis Kamal ◽

Ismudi Muchsin ◽

Endi Setiadi Kartamihardja

Keyword(s):

Sex Ratio ◽

Anabas Testudineus ◽

Commercial Fish ◽

Male And Female ◽

Climbing Perch ◽

Male Sex ◽

First Maturity ◽

Egg Diameter ◽

Floodplain Area ◽

Somatic Index

Ikan betok (Anabas testudineus) adalah salah satu jenis ikan ekonomis penting yang dihasilkan dari perairan paparan banjiran. Penelitian yang bertujuan untuk mengkaji beberapa aspek biologi reproduksi ikan betok di paparan banjiran Lubuk Lampam, Kabupaten Ogan Komering Ilir dilakukan pada bulan Nopember 2012-Oktober 2013. Sampel ikan ditangkap setiap bulanmenggunakan alat tangkap jaring dan bengkirai.Analisis data meliputi sebaran frekuensi ukuran panjang, nisbah kelamin, tingkat kematangan gonad, indeks kematangan gonad, ukuran pertamakali matang gonad, potensi reproduksi dan pola reproduksi. Jumlah sampel ikan betok yang diperoleh sebanyak 540 ekor, terdiri dari 187 ekor ikan jantan dan 353 ekor ikan betina, dengan kisaran panjang ikan betina antara 27-224 mm dan ikan jantan antara 48-243 mm. Rasio kelamin ikan jantan dan betina adalah 0,53 : 1. Tingkat kematangan gonad (TKG) ikan jantan dan betina yang paling banyak ditemui adalah TKG I dengan frekuensi tertinggi pada ukuran 116-132 mm dan 114-129 mmmasing-masing berjumlah 34 dan 33 ekor. Perkembangan tingkat kematangan gonad ikan betok dipengaruhi oleh perubahan tinggimuka air secara musiman. Indek kematangan gonad ikan jantan pada TKGIV berkisar 1,3-15,0%dan ikan betina berkisar antara 1,2 17,1%. Ukuran pertama kali matang gonad ikan betina adalah pada panjang total 160 mm dan ikan jantan pada panjang total 177 mm. Fekunditas ikan betok berkisar antara 224–182.736 butir dengan diameter telur berkisar antara 0,465-1,026 mmdengan pola pemijahan secara sebagian. Climbing perch, Anabas testudineus is a dominant commercial fish inhabit floodplain area of Lubuk Lampam, Ogan Komering Ilir Regency. A study aimed to investigate some aspects of the reproductive biology of climbing perch has been conducted at floodplain of Lubuk Lampam, Ogan Komering Ilir regency from November 2012 to October 2013. Fish sampling was conducted every month using nets and bamboo trap. The data analysis includes lenght frequency distribution, sex ratio, the gonado maturity, gonado somatic index, the size at first maturity, fecundity and reproductive patterns. Climbing perch sample amounted of 540 specimen compose of 187 males and 353 females, with the lenght frequency between 27-224 mm (female) and 48-243 mm (male). Sex ratio of the male and female of the climbing perch was 0,53 : 1. The gonado maturity of male and female are mostly at the first level with the highest frequency between 116-132 mm and 114-129 mm, equivalent to 34 and 33 specimen, respectively. The development of gonado maturity of climbing perch was influenced by seasonally of water level fluctuation. Gonado somatic index of maturity of male and female range 1.3-15.0% and 1.2 -17.1%, respectively. The size at the first maturity of the female was 160 mm lenght and of the male was 177 mm lenght. The fecundity ranges 224 to182,736 eggs with the egg diameter ranges 0.465-1.026 mm and the climbing perch was classified into partially spawner.

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Population structure and reproductive behavior of Sinaloa cichlid Cichlasoma beani (Jordan, 1889) in a tropical reservoir

Neotropical Ichthyology ◽

10.1590/s1679-62252011005000035 ◽

2011 ◽

Vol 9 (3) ◽

pp. 593-599 ◽

Cited By ~ 2

Author(s):

Melgen A. García-Lizárraga ◽

Francisco Enrique Soto-Franco ◽

Javier Marcial de Jesús Ruiz Velazco-Arce ◽

José Iván Velázquez-Abunader ◽

Jorge Saúl Ramírez-Pérez ◽

...

Keyword(s):

Population Structure ◽

Sex Ratio ◽

Multinomial Distribution ◽

Mesh Size ◽

Condition Index ◽

Reproductive Period ◽

Tropical Reservoir ◽

Timing Of Reproduction ◽

First Maturity ◽

Size At First Maturity

The population structure and reproductive condition of the Sinaloa cichlid Cichlasoma beani from samples obtained from June 2000 to July 2001 were determined. Samples in the first week each month from the largest trader of tilapia in the Aguamilpa Reservoir in Mexico and were caught in gillnets (9.6 and 11.4 cm stretch-mesh size). Of 596 specimens, there were 427 males and 169 females; monthly sex ratio, frequency of lengths by the multinomial distribution, timing of reproduction, condition index, and size at first maturity was determined. Differences in the sex ratio and monthly totals were significant, favoring males, except for September 2000 and March 2001. From one (August 2000) to three modal groups (July 2000 and June 2001) were identified by size. There were no significant differences in standard length weight relationships by sex, which indicated that a shared model for both genders is appropriate, and isometric growth was detected. Based on the proportion of mature and partially matures fish, the main reproductive period was April through June; size at first maturity was 18.9 cm. Water temperature was not significantly related to the percentage of mature and partially matures Sinaloa cichlids or spawning. These findings provide information for regulating the Cichlasoma beani fishery in this region such minimum legal size and non-fishing period.

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The Biological Aspect of Mackerel Scad (Decapterus Macarellus Cuvier, 1833) In Samudera Hindia (West Sumatera Block)

Omni-Akuatika ◽

10.20884/1.oa.2020.16.3.851 ◽

2020 ◽

Vol 16 (3) ◽

pp. 92

Author(s):

Heri Widiyastuti ◽

Andina Ramadhani Putri Pane ◽

Moh Fauzi ◽

Thomas Hidayat

Keyword(s):

Indian Ocean ◽

Sex Ratio ◽

Average Length ◽

Mesh Size ◽

Growth Patterns ◽

Purse Seine ◽

West Sumatra ◽

The Indian Ocean ◽

Biological Aspects ◽

First Maturity

Mackerel scad (Decapterus macarellus) is one of the important economical caught in the Indian Ocean West Sumatra waters captured using purse seine. Increased production of mackerel scad will lead to increased exploitation, causing population changes. Therefore, research was carried out to find out the biological aspects of the fish so that resource management can be done. The sampling was conducted in Lampulo, Sibolga, and Air Bangis from February to November 2016 with total samples of 716 fishes. This research was conduct to study some biological aspects which consist of size distribution, length-weight relationship, sex ratio, gonad maturity level, the length at first capture, and length of the first maturity in Indian ocean west Sumatera waters. The results showed that the size of the mackerel scad had ranged between 16 - 33.6 cm FL and the average was 24.5 cm. Growth patterns are allometric negative, sex ratio male and female in an unbalanced condition. The mackerel scad is most caught by purse seine in maturity condition. The average length at first captured was 25.08 cm FL and length at first mature was 20.47 cm FL. These were an ideal biological condition and must be maintained because it provides an opportunity for fish to increase the population. The mesh size purse must follow the Ministry of Maritime Affairs and Fisheries Regulation Number 71/2016 that adjusted for minimum at 1 inch. Keywords: Mackerel scad, Indian Ocean, purse seine

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Sex ratio, maturity stage and fist maturity of yellowfin parrotfish Scares flavipectoralis Schultz, 1958 in Wallace line at Spermonde Archipelago, South Sulawesi

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/564/1/012003 ◽

2020 ◽

Vol 564 ◽

pp. 012003

Author(s):

J Tresnati ◽

A Yanti ◽

N Rukminasari ◽

Irmawati ◽

Suwarni ◽

...

Keyword(s):

Sex Ratio ◽

Maturity Stage ◽

South Sulawesi ◽

Spermonde Archipelago

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ASPEK BIOLOGI PERIKANAN IKAN LAYANG (Decapterus Macrosoma) YANG TERTANGKAP DENGAN BAGAN RAMBO DI PERAIRAN PANTAI SUMPANG BINANGAE KABUPATEN BARRU

JOURNAL OF INDONESIAN TROPICAL FISHERIES (JOINT-FISH) : Jurnal Akuakultur, Teknologi Dan Manajemen Perikanan Tangkap, Ilmu Kelautan ◽

10.33096/joint-fish.v4i1.85 ◽

2021 ◽

Vol 4 (1) ◽

pp. 12-21

Author(s):

Hasrun Abdullah ◽

Kasmawati Saleh

Keyword(s):

Sex Ratio ◽

Fish Species ◽

Economic Value ◽

Pelagic Fish ◽

Small Pelagic Fish ◽

Male And Female ◽

Flying Fish ◽

Biological Aspects ◽

First Maturity ◽

First Time

Flying fish is one of the dominant pelagic fish caught and has high economic value in Sumpang Binangae Waters. This fish is caught by many chart rambo fishing gear. The purpose of this study was to determine the biological aspects of flying fish especially those caught in the waters of Sumpang Binangae, Barru Regency. This research will be conducted for four months, from May 2020 to August 2020, which is located at the Sumpang binangae Fish Landing Base, Barru district. Identification of flying fish species is done visually by looking at the color and body shape and special characteristics based on the Guidelines for Practical Identification of Small Pelagic Fish Species in Figure, Suwarso, 2010, The composition of the type of catch is calculated based on the amount of catch (tonnes). Sex ratio, TKG, (Walpole 1993), Length of First-Time Gonads of Fish (Lm)The results showed that based on the composition of the types of fish caught, the percentage of the dominant catch was 27.41% mackerel (Rastrelliger kanagurta), 24.26% flying fish (Decapterus macrosoma), 23 anchovies (Stolephorus sp). 28%, squid (Loligo sp) by 2.24%, flying fish (Cypselurus sp) by 8.98% and tembang fish (Sardinella fimbriata) by 13%, while the type of flying fish caught was only one type, namely white-tailed flying fish. slightly yellowish (Decapterus macrosoma). Comparison of the number of male and female sex, it was found that the sex ratio of male and female Layang fish (D. macrosoma) was 52.83%: 47.17% or 1.12: 0.89, l. The size of the first maturity of male flying fish gonads in Barru waters is at the size of 15.68 cm or 156 mm and the female is at the size of 15.62 cm or 156 mm, while the male and female fish that are immature gonads are more than the fish that are mature gonads.

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Influence of the flood pulse on the reproduction of Tocantinsia piresi (Miranda Ribeiro) and Auchenipterus nuchalis (Spix & Agassiz) (Auchenipteridae) of the middle Xingu River, Brazil

Brazilian Journal of Biology ◽

10.1590/1519-6984.00114bm ◽

2015 ◽

Vol 75 (3 suppl 1) ◽

pp. 158-167 ◽

Cited By ~ 3

Author(s):

TMS. Freitas ◽

BS. Prudente ◽

VA. Oliveira ◽

MNC. Oliveira ◽

EG. Prata ◽

...

Keyword(s):

Sex Ratio ◽

Condition Factor ◽

Gonadosomatic Index ◽

Flood Pulse ◽

Allometric Growth ◽

Xingu River ◽

Ratio Size ◽

Flood Period ◽

First Maturity ◽

Size At First Maturity

Abstract This study investigates the influence of the flood pulse on the reproductive biology of the auchenipterids Tocantisia piresi (Miranda Ribeiro, 1920) and Auchenipterus nuchalis (Spix & Agassiz, 1829) from the middle Xingu River in the Brazilian state of Pará. The specimens were collected every three months between April, 2012, and January, 2014, covering four distinct periods (flood, ebb, dry, and filling). The sex ratio, size at first maturity, gonadosomatic index, and condition factor were analysed in the two species, and evaluated in the context of the different hydrological periods. A total of 897 specimens of T. piresi were collected, of which 467 were female, and 430 males, and 383 A. nuchalis (286 females and 97 males). In T. piresi, the sex ratio was biased only in the filling and ebb periods, whereas in A. nuchalis, it departed significantly from the expected ratio of 1:1 in all periods, with a predominance of females. The female T. piresi mature at a smaller size than the males, with the opposite of the pattern being recorded in A. nuchalis. In T. piresi, the breeding peak was observed during the low water periods, whereas in A. nuchalis, the peak was recorded in the flood periods. Male and female T. piresi presented similar positively allometric growth rates, whereas in A. nuchalis, growth was negatively allometric, but rates were different between genders. A higher condition factor was recorded in the females of both species during the ebb period. Overall, the results of this study reveals distinct flood pulse effects on the reproductive parameters of the two auchenipterid species studied; for A. nuchalis the spawning seems to happen at the flood period and for T. piresi at the dry season of the middle Xingu River.

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Population and reproductive parameters of the red-tailed catfish, Phractocephalus hemioliopterus (Pimelodidae: Siluriformes), from the Xingu River, Brazil

Neotropical Ichthyology ◽

10.1590/1982-0224-20190015 ◽

2019 ◽

Vol 17 (2) ◽

Author(s):

Tiago Magalhães da Silva Freitas ◽

Luciano Fogaça de Assis Montag

Keyword(s):

Sex Ratio ◽

Amazon Basin ◽

Gonadosomatic Index ◽

Management Strategies ◽

Weight Ratio ◽

High Water ◽

Commercial Fish ◽

Xingu River ◽

Flood Period ◽

First Maturity

ABSTRACT A field study of the sex ratio, length-weight ratio, body size at first gonadal maturation, and the breeding season of the red-tailed catfish, Phractocephalus hemioliopterus, was carried out in the region of the middle Xingu River in the eastern Amazon basin. The fish were sampled quarterly from September 2012 to January 2014 using gillnets and long lines. The sex ratio was balanced, and while males and females were similar in standard length, the females were heavier than the males, on average. The males presented negative allometric growth, and the females, isometric growth. The estimated size at first maturity was 77.8 cm. The variation in the gonadosomatic index and the greater frequencies of mature specimens indicated a reproductive peak at the beginning of the high-water (flood) period. As P. hemioliopterus is an important commercial fish, our findings will contribute to the future development of effective conservation and management strategies, such as minimum catch size and a close season that is appropriate for the region. These data will also provide important insights for the evaluation of potential impacts on the biology of this fish resulting from the construction of Belo Monte dam.

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