Gonad Maturity and Fecundity of Bluecheek Silver Grunt (Pomadasys argyreus) in Palabuhanratu Bay, West Java

A total of 806 fish samples were collected from the catch of local fishermen. The sex ratio of Pomadasys argyreus was 1:0,90. Four stages of gonadal development were observed in males and females, which dominated by stage I and II (immature). The highest gonadosomatic index (GSI) in males was 1,14 in September, while in females was 1,80 in May. Length at first maturity of Pomadasys argyreus was 140,12 mm for males and 135,01 mm for females. The highest value of condition factor was 1,05 for males and 1,10 for females. This fish spawn partially (partial spawner) and estimated spawns throughout the year with a spawning peak in June.

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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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Beberapa Aspek Reproduksi Siput Lambis lambis di Pesisir Perairan Yenusi, Biak

Oseanologi dan Limnologi di Indonesia ◽

10.14203/oldi.2016.v1i3.74 ◽

2016 ◽

Vol 1 (3) ◽

pp. 1

Author(s):

Andriani Widyastuti ◽

Ludi Parwadani Aji

Keyword(s):

Sex Ratio ◽

Management Strategies ◽

Gonadal Development ◽

Shell Size ◽

Gonad Maturity ◽

Males And Females ◽

Over Exploitation ◽

Number Of Males ◽

Time Of Harvest

Some Aspects of Reproduction in Conch Lambis lambis of Yenusi Coastal Waters, Biak. Lambis lambis is a very popular conch species that has been harvested in all sizes encountered. This condition is very alarming because in the long term, its existence in nature will be reduced because there is no chance to reproduce naturally. This study aims to determine the sex ratio and gonad maturity levels of L. lambis in Yenusi waters, so the appropriate time of harvest can be arranged. Samples were collected every month from January to December 2013. Testing and histological analysis were performed in the laboratory. Samples collected were 99 individus with the number of males 45 individus and females 54 individus. The sex ratio of males and females was 1.0:1.2. Gonad maturity level found included all four stages of gonadal development, from TKG I to TKG IV. Gonadal development showed the process of formation and maturation, and the spawning occured throughout the year, with peak spawning in January until March 2013. The size of the shell length obtained ranged from 4.55 to 13.72 cm indicating over-exploitation. Due to the custom local where residents harvested the conches in all sizes found, sustainable management strategies are urgently needed, including moratorium period when L. lambis is at the peak of spawning, and harvest should only be performed on adult individuals with a minimum shell size of 7 cm, while observing the thickness of the shell and marginal digitations have been formed.

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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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Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

Neotropical Ichthyology ◽

10.1590/1982-0224-20150152 ◽

2016 ◽

Vol 14 (4) ◽

Cited By ~ 4

Author(s):

Tiago Magalhães da Silva Freitas ◽

◽

Vitor Hudson da Consolação Almeida ◽

Luciano Fogaça de Assis Montag ◽

Nelson Ferreira Fontoura ◽

...

Keyword(s):

Growth Pattern ◽

Sexual Maturity ◽

Gonadosomatic Index ◽

Gonadal Development ◽

Visual Identification ◽

Males And Females ◽

Two Phases ◽

First Maturity ◽

Size At First Maturity

ABSTRACT Relationship between length and weight (LWR) is used to describe aspects concerning the life cycle of fish, but does not considers possible changes during the lifetime mainly due to the sexual maturation. Thus, this study aims to identify the size at first maturity of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) and infer if the reproductive engagement could change growth pattern, concerning the LWR. Estimates of the size at first maturity (L 50 ) were made by visual identification of gonadal development and through the gonadosomatic index (G SI ). L 50 was estimated as 12.5 cm for males and 13.0 cm for females when applied visual identification of gonads development. L 50 estimates increased to 13.05 cm for males and 13.7 cm for females when estimated from G SI values. LWR was adjusted by using a regular power function and through the polyphasic growth model, with proportionality and allometric coefficients changing in a two phases. The results indicate differences in the growth pattern concerning males and females, as well as polyphasic growth. The change in the growth pattern of the polyphasic LWR was estimated at 11.42 cm for males and 12.53 cm for females, suggesting that changes in the growth pattern can sign-out the attainment maturity in this catfish.

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BEBERAPAASPEKBIOLOGI IKANKUNIRAN (Upeneus sulphureus) DI PERAIRANTEGALDANSEKITARNYA

BAWAL Widya Riset Perikanan Tangkap ◽

10.15578/bawal.3.4.2011.261-267 ◽

2017 ◽

Vol 3 (4) ◽

pp. 261

Author(s):

Duranta Diandria Kembaren ◽

Tri Ernawati

Keyword(s):

Sex Ratio ◽

Frequency Distribution ◽

Condition Factor ◽

Growth Characteristic ◽

Demersal Fish ◽

Maturity Stage ◽

Gonad Maturity ◽

Level 3 ◽

Biological Aspects ◽

First Maturity

Ikan kuniran (Upeneus sulphureus)merupakan salah satu ikan demersal dari familiMullidae banyak tertangkap di perairan Laut Jawa. Penelitian ini tentang beberapa aspek biologi ikan kuniran di perairan Tegal dan sekitarnya dilakukan pada bulan Maret, April, dan Agustus 2009. Penelitian ini bertujuan untuk mengkaji beberapa aspek biologi ikan kuniran, seperti nisbah kelamin, sebaran frekuensi panjang, hubungan panjang dan bobot, tingkat kematangan gonad, panjang pertama kali matang gonad (length at first maturity), dan faktor kondisi. Ikan yangdiamati 358 ekor yang terdiri atas 170 jantan dan 188 betina. Perbandingan jumlah ikan jantan dan betinamenunjukanrasio kelamin yang tidak seimbang. Berdasarkan atas sebaran frekuensi panjang, ikan dengan panjang 9 cmFL mendominansi hasil tangkapan pada bulan Maret dan April dan pada bulan Agustus didominansi ikan dengan panjang 11 cmFL. Pertumbuhan ikan kuniran pada bulan Maret bersifat allometrik negatif, sedangkan pada bulan April danAgustus bersifat isometrik.Analisis tingkat kematangan gonad menunjukan bahwa pada bulan Agustus banyak ditemukan tingkat kematangan gonad I dan II dan pada bulanMaret banyak ditemukan tingkat kematangan gonad III dan IV. Ikan kuniran diduga pertama kali matang gonad pada ukuran panjang 9,87 cmFL. Faktor kondisi menunjukan tidak ada perbedaan antara bulan Maret, April, dan Agustus. The silver goatfish (Upeneus sulphureus) is demersal fish which caught excessively in the Java Sea and taxonomically belong to the family Mullidae. Some biological aspects of the silver goatfish in Tegal and adjacent waters were studied on March, April, and August in 2009. The objective of this research were to know some biological aspects, i.e. sex ratio, length frequency distribution, length weight relationship, gonad maturity stage, length at first maturity, and condition factor. A total of 358 fishes that consisted of 170 males and 188 females were examinated their biological aspects. The composition of male and female showed an unequal sex ratio. According to the lenght frequency distribution, the fishes of 9 cmFL were dominant onMarch and April, while on August was dominated by the fishes of 11 cmFL. The growth characteristic of the silver goatfish were allometric negative on March and isometric on April and August. Gonad maturity stage level 1 and 2 were dominant on August and level 3 and 4 onMarch. Lenght at first maturity (Lm) of silver goatfish were 9,87 cmFL. The condition factor showed that there is no difference on March, April, and August.

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PERTUMBUHAN, FAKTOR KONDISI, DAN BEBERAPA ASPEK REPRODUKSI IKAN LEMURU (Amblygaster sirm, Walbaum 1792) DI PERAIRAN SELAT SUNDA

BAWAL Widya Riset Perikanan Tangkap ◽

10.15578/bawal.9.1.2017.43-56 ◽

2017 ◽

Vol 9 (1) ◽

pp. 43

Author(s):

Nidya Kartini ◽

Mennofatria Boer ◽

Ridwan Affandi

Keyword(s):

Sex Ratio ◽

Condition Factor ◽

Growth Parameters ◽

Sampling Technique ◽

Biological Information ◽

Male And Female ◽

Conservation Measure ◽

Males And Females ◽

First Maturity ◽

Size At First Maturity

Ikan lemuru (Amblygaster sirm) merupakan salah satu komiditas utama di Selat Sunda yang menjadi target nelayan di Pelabuhan Perikanan Pantai Lebuan. Informasi biologi dibutuhkan untuk menyusun langkah konservasi ikan lemuru. Penelitian ini bertujuan untuk menganalisis kondisi biologis ikan lemuru di perairan Selat Sunda melalui pengkajian parameter pertumbuhan, faktor kondisi, dan beberapa aspek reproduksi. Pengambilan ikan contoh dilakukan pada bulan April-Agustus 2015 dari hasil tangkapan nelayan yang didaratkan di PPP Labuan, Banten menggunakan teknik Penarikan Contoh Acak Berlapis. Jumlah ikan contoh yang diambil selama penelitian sebanyak 527 ekor ikan jantan dan 245 ekor ikan betina. Hasil penelitian menunjukkan bahwa pola pertumbuhan ikan lemuru jantan dan betina adalah isometrik, nilai faktor kondisi ikan lemuru jantan berkisar 0,9346 – 1,0294 dan betina berkisar 0,9401 – 1,0738, parameter pertumbuhan L∞, K, dan t0 pada ikan jantan adalah 248,80 mm; 0,24/tahun;dan -0,38. Adapun parameter (L∞, K, dan t0) pada ikan betina adalah 235,26 mm; 0,46/tahun, dan -0,20. Nisbah kelamin ikan lemuru jantan dan betina TKG IV adalah 0,75:1. Ukuran pertama kali matang gonad (Lm) ikan lemuru jantan dan betina adalah 188 mm dan 186 mm. Sedangkan ukuran pertama kali tertangkap (Lc) ikan lemuru jantan dan betina adalah 172 mm dan 173 mm. Musim pemijahan ikan lemuru diduga terjadi pada bulan Mei dan Juli.The spotted sardinella (Amblygaster sirm) was one of main commodities in the Sunda Strait that maily targeted by fishers in Labuan Coastal Fishing Port, Banten. The biological information needed to setup conservation measure of the spotted sardinella. This research aims to analyse the biological conditions of spotted sardinella in the Sunda Strait by reviewing parameters of growth, condition factor, and some reproduction aspect. Research was conducted in April-August 2015 in Labuan Coastal Fishing Port, Banten by using Random Stratified Sampling technique. About 700 samples (527 male and 245 female fishes) collected during study. The results showed that the growth pattern of male and female were isometric, value of condition factor for male ranged from 0,9346 – 1,0294 and for female ranged from 0,9401 – 1,0738. The estimated growth parameters (L∞, K, and t0) for male were 248,80 mm; 0,24 year-1;and -0,38 respectively. While, the parameters (L∞, K, and t0) of female were 235,26 mm; 0,46 year-1;and -0,20 respectively. The sex ratio between males and females for spotted sardinella was 0,75:1. The size at first maturity (Lm) of male and female were 188 mm and 186 mm, respectively. In addition, the size a first caught (Lc) of male and female was 172 mm and 173 mm, respectively. Thespawning season spotted sardinella possibly occurs in May and July.

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Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil

Neotropical Ichthyology ◽

10.1590/1982-0224-20140052 ◽

2015 ◽

Vol 13 (2) ◽

pp. 371-382 ◽

Cited By ~ 3

Author(s):

Éverton Luís Zardo ◽

Everton Rodolfo Behr

Keyword(s):

Population Structure ◽

Sex Ratio ◽

Reproductive Biology ◽

Condition Factor ◽

Gonadosomatic Index ◽

Maturity Stage ◽

Allometric Growth ◽

Males And Females ◽

Lotic Environments ◽

Gonadal Condition

The objective of this study was to analyze population structure (spatial distribution, seasonal distribution and distribution by length classes, sex ratio and length-weight relationship) and aspects of the reproductive biology of Loricariichthys melanocheilus. Fish were sampled bimonthly using gillnets and trammel nets in lentic and lotic environments in the rio Ibicuí, between the years 2000 and 2001. Were collected 410 specimens: 230 females, 164 males and 16 specimens whose sex could not be determined. A greater number of specimens were collected in October/November and December/January and in lentic environments. The greater length classes had a higher amount of females (p < 0.05) and the sex ratio in all sampling periods was 1.38 females per male. Both males and females showed positive allometric growth (b = 3.299 and b =3.487, respectively). The highest values for gonadosomatic index (GSI) and gonadal condition factor (K) were observed from August/September and peaked in October/November, just like the highest frequencies of females at maturity stage C (mature), which is indicative that the breeding season occurs at this time.

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Reproductive cycle and gonadal development of Macquarie perch, Macquaria australasica Cuvier (Percichthyidae), in Lake Dartmouth and tributaries of the Murray - Darling Basin, Victoria, Australia

Marine and Freshwater Research ◽

10.1071/mf97012 ◽

1998 ◽

Vol 49 (2) ◽

pp. 163 ◽

Cited By ~ 23

Author(s):

P. Appleford ◽

T. A. Anderson ◽

G. J. Gooley

Keyword(s):

Reproductive Cycle ◽

Gonadosomatic Index ◽

Gonadal Development ◽

Minimum Size ◽

Testicular Development ◽

Murray Darling Basin ◽

Eastern Australia ◽

Males And Females ◽

First Maturity ◽

Size At First Maturity

The gonadal development, reproductive cycle and growth of Macquarie perch, Macquaria australasica Cuvier, in Lake Dartmouth and selected tributaries of the Murray–Darling River Basin in south-eastern Australia were evaluated. Gonadosomatic index (GSI) and histological analysis were used to determine gonadal development and age and size at first maturity in the resident Lake Dartmouth population. GSI analysis was also used to determine age and size of Macquarie perch at first maturity in the inflowing Mitta Mitta River and other riverine populations within the Goulburn River catchment. Males appeared slightly smaller at first spawning than females at all sites; both sexes were fully mature at four years of age. Differences in size at first maturity were found between the lake and river populations; both males and females of river populations tended to mature at a much smaller size than the fish resident in the lake. Spawning occurred around November. Ovarian and testicular development in this species follows a pattern similar to that of other native Australian percichthyids. The implications for management of recreational fisheries based on minimum size regulations is discussed in relation to site-specific differences in growth rates and size of first maturity of fish.

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Understanding selected growth aspects in Redbelly Tilapia, Coptodon zilli (Gervais) and Largemouth Bass, Micropterus salmoides (Lacepède) in Lake Naivasha, Kenya; Fisheries Management Perspective

PAN AFRICA SCIENCE JOURNAL ◽

10.47787/pasj.2020.02.21 ◽

2020 ◽

Vol 01 (01) ◽

pp. 72

Author(s):

James Last Keyombe ◽

◽

Kevin Obiero ◽

Edna Waithaka ◽

Nicholas Outa ◽

...

Keyword(s):

Sex Ratio ◽

Fish Species ◽

Condition Factor ◽

Micropterus Salmoides ◽

Good Condition ◽

Lake Naivasha ◽

Early Maturity ◽

Weight Relationship ◽

Fish Samples ◽

First Maturity

Coptodon zilli and Micropterus salmoides were introduced into Lake Naivasha in 1929 and 1959 respectively. The reasons for the introduction were to boost the fisheries and for recreational fishing respectively. However, the numbers of the two fish species in the lake have been declining over the years. It is therefore necessary to assess various aspects of their growth such as length-weight relationship, condition factor, sex ratio and length at first maturity to inform management and policy making for enhanced recovery and establishment of their populations. Length-weight relationship, condition factor, sex ratio and length at first maturity of the fish were studied from October 2016 to November 2018. A total of 303 fish samples; 193 C. zilli and 110 M. salmoides were studied. Results showed that C. zilli and M. salmoides had an allometry coefficient value of 2.9 and 3.1 and condition factor (K) value of 1.77 and 1.39 respectively. The sex ratios (male: female) of C. zilli and M. salmoides were 1.1:1 and 1.3: 1 respectively. The shortest total length for mature C. zilli and M. salmoides recorded were 12 cm and 26.5 cm while 21.8 cm and 51 cm were for the longest respectively. The fish growth pattern therefore failed to obey the cube law of b=3 thus exhibiting allometric growth. The two fish species were found to be in good condition with K factor above 1. It can therefore be concluded that the fish are generally in a good condition though the early maturity especially for C. zilli could be a sign of pressure either from environmental factors or human induced. Domination of the species by males, although a common feature in African lakes, is a case for concern since it presents uncertainty on the future of the fisheries. Restocking of Lake Naivasha with the two fish species should be considered and proper fishing practices enforced

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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 ◽

10.29244/jitkt.v9i1.17921 ◽

2017 ◽

Vol 9 (1) ◽

pp. 113-124 ◽

Cited By ~ 1

Author(s):

Nisha Desfi Arianti ◽

M.F. Rahardjo ◽

Ahmad Zahid

Keyword(s):

Sex Ratio ◽

Sampling Period ◽

Spawning Season ◽

Diameter Distribution ◽

Male And Female ◽

Fish Samples ◽

Males And Females ◽

Mature Fish ◽

First Maturity ◽

Egg Diameter

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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