scholarly journals Comparative Studies on Gonad Development, Fecundity and Oocyte Maturation of Spotted Snakehead, Channa punctatus (Bloch, 1793) in Different Water Bodies

2020 ◽  
pp. 75-87
Author(s):  
Md. Almamun Farid ◽  
M. Anisur Rahman ◽  
Shammi Aktar ◽  
Moumita Choudhury ◽  
Syeda Maksuda Yeasmin ◽  
...  
Keyword(s):  
Oocyte Maturation ◽  
Captive Breeding ◽  
Gonadosomatic Index ◽  
Species Conservation ◽  
Gonad Development ◽  
Water Bodies ◽  
Channa Punctatus ◽  
Relative Fecundity ◽  
Absolute Fecundity ◽  
Production Techniques

The present study was carried out to compare gonad development, oocyte maturation and fecundity of the spotted snakehead (Channa punctatus) fish during January to November 2015 in different water bodies (such as pond, Joghati baor and Bhairab river) in Jashore, Bangladesh. Mean GSI (gonadosomatic index) values of the female C. punctatus during January, March, May, July, September and November were significantly highest in pond, followed by those in Joghati baor and the lowest in Bhairab river. Absolute fecundity during the month of July in pond, baor and river was 30,006±2,027, 23,629±2,356 and 16,659±2,486, respectively, and the relative fecundity was 5064±183, 4865±106 and 4641±138 eggs, respectively. Mean ova diameter in pond, baor and river in March was 0.25±0.04 mm, 0.16±0.02 mm and 0.21±0.03 mm; in May was 0.36±0.03 mm, 0.29±0.03 mm and 0.23±0.04 mm; in July was 1.06±0.06 mm, 0.95±0.05 mm and 0.87±0.03 mm; and in September was 0.84±0.04 mm, 0.82±0.03 mm and 0.72±0.05 mm, respectively. Mean GSI values of the male C. punctatus during January, March, May, July, September and November were significantly higher in pond than those in baor and river, respectively. The mean highest GSI for female was found to be 6.06±0.11 in pond during the month of July, while the lowest GSI of 0.30±0.08 was in Bhairab river during November. The highest GSI value for male was obtained to be 0.70±0.16 in pond during the month of July, while the lowest GSI of 0.12±0.03 was found in Bhairab river during January. However, significant differences (P<0.05) were found in GSI values, absolute fecundity, relative fecundity and ova diameter of C. punctatus during different months in pond, Joghati baor and Bhairab river. The findings from the present research would immensely be useful for captive breeding and seed production techniques of C. punctatus for aquaculture production, sustainable management and species conservation.

scholarly journals Observations on impact of stunting on breeding performance of farmed rohu Labeo rohita (Hamilton, 1822)

2021 ◽  
Vol 68 (1) ◽  
Author(s):  
P. P. Suresh Babu ◽  
P. Srinivasa Rao ◽  
J. Krishna Prasad ◽  
Rupam Sharma ◽  
A. M. Babitha Rani ◽  
...  
Keyword(s):  
Detrimental Effect ◽  
Labeo Rohita ◽  
Gonadosomatic Index ◽  
Growth Enhancement ◽  
Breeding Performance ◽  
Relative Fecundity ◽  
Absolute Fecundity ◽  
Development Period ◽  
Hatching Percentage ◽  
Ovary Growth

Breeding performance of stunted rohu Labeo rohita (Hamilton, 1822) was compared with normally reared rohu. Randomly selected stunted and normal fishes were tagged and reared together in a single earthen pond for broodstock development. Both groups exhibited growth enhancement during the broodstock development period, though normal fishes were found larger in size than the stunted fishes, after the rearing period. Gonadosomatic Index (GSI) of female fishes indicated a similar trend of ovary growth in both the groups. Breeding performances of the broodstocks were evaluated by induced breeding trials. Parameters such as absolute fecundity, relative fecundity, number of spawns produced and hatching percentage were significantly higher (p<0.05) (almost double) in normal fishes than the stunted fishes. The present results indicate that the stunting process (6 months) is having detrimental effect on the breeding performance of rohu and thus stunted fishes are not ideal for broodstock development.

scholarly journals REPRODUCTIVE BIOLOGY OF THE SPINY EEL MACROGNATHUS PANCALUS HAMILTON, 1822 FROM UPPER ASSAM, INDIA

2020 ◽  
Vol 67 (1) ◽  
Author(s):  
S.K. Abujam ◽  
S.P. Biswas
Keyword(s):  
Sexual Dimorphism ◽  
Sex Ratio ◽  
Reproductive Biology ◽  
Body Shape ◽  
Gonadosomatic Index ◽  
Percentage Distribution ◽  
Relative Fecundity ◽  
Absolute Fecundity ◽  
Maturity Stages ◽  
Fish Samples

Reproductive biology of spiny eel Macrognathus pancalus Hamilton, 1822 was studied from the waterbodies of upper Assam, India. Sexual dimorphism was easily distinguished based on their body shape and colouration. Among the 467 fish samples examined, 312 males and 155 females were identified and the Male:Female (M:F) ratio ranged from 1:0.08 in November to 1:2.17 in June with overall sex ratio of 1:0.5. Five maturity stages were identified in a year and percentage distribution of each stage was calculated. The gonadosomatic index (GSI) ranged from 0.42 to 8.08 for females and from 0.33 to 1.25 for males. The length at 50% of the fishes attained maturity (Lm50) was 9-12 cm in males and at 12-15 cm in females, indicating males matures at moderately smaller size than their female counterparts. Ova diameter ranged from 0.3 to 1.3 mm; absolute fecundity ranged from 765.48 to 1691.96 and relative fecundity from 57.9 to 152.17. M. pancalus spawned once in a year with peak spawning between June and August.

scholarly journals Fecundity and Gonadosomatic Index of Sucker Throat Catfish, Pseudecheneis sulcata (McClelland, 1842) from the Snow-fed Tamor River in Eastern Nepal

2021 ◽  
Vol 11 (2) ◽  
pp. 1-9
Author(s):  
Jash Hang Limbu ◽  
Dipak Rajbanshi ◽  
Prakash Kumar ◽  
Bharat Raj Subba
Keyword(s):  
Body Weight ◽  
Reproductive Biology ◽  
Gonadosomatic Index ◽  
Spawning Season ◽  
Stream Fish ◽  
Female Fish ◽  
Ovary Weight ◽  
Relative Fecundity ◽  
Absolute Fecundity ◽  
Total Length

In comparison to other nations, the Nepalese information on the reproductive biology of hill-stream fish is limited. So, the purpose of the present study was to provide information related to reproductive biology of a hill-stream sucker throat catfish Pseudecheneis sulcata from the snow-fed Tamor River, Nepal. The study was carried out from June 2018 to May 2019.  A total of 57 female fish was collected. The fecundity of 22 females was assessed, while the gonadosomatic index was determined using all the collected samples. The absolute fecundity ranged from 2,316 to 7,597 eggs, with an average of 3,660 ± 210. This range of absolute fecundity indicates that Pseudecheneis sulcata is a moderately fecund fish when compared to certain low fecund species and some exceptionally fecund fish with tens of thousands of eggs. Relative fecundity ranged from 65.47 to 129.11 with a mean of 88.98 ± 4.35. The present study demonstrated that absolute fecundity was moderately correlated with total length (r = 0.45) and strongly linked with body weight (r = 0.78), and ovary weight (r = 0.80). Mean gonadosomatic index (GSI) was recorded the highest in January (15.7 ± 1.22%), and showed a decrease in the subsequent month of February (10.3 ± 0.75%), March (6.25 ± 0.28%) and April (1.66 ± 0.40%). The trends of GSI might have indicated that the sucker throat catfish was a batch spawner, with spawning season occuring between January and March.

Captive management and the maintenance of genetic diversity in a vulnerable marsupial, the greater bilby

2015 ◽  
Vol 37 (2) ◽  
pp. 170 ◽  
Author(s):  
Emily J. Miller ◽  
Mark D. B. Eldridge ◽  
Keith Morris ◽  
Neil Thomas ◽  
Catherine A. Herbert
Keyword(s):  
Genetic Diversity ◽  
Captive Breeding ◽  
Natural Habitat ◽  
Species Conservation ◽  
Molecular Data ◽  
Breeding Programs ◽  
Captive Populations ◽  
Genetic Impact ◽  
Captive Breeding Programs

The endemic Australian greater bilby (Macrotis lagotis) is a vulnerable and iconic species. It has declined significantly due to habitat loss, as well as competition and predation from introduced species. Conservation measures include a National Recovery Plan that incorporates several captive breeding programs. Two of these programs were established within 12 months of one another (1997/98), with the same number and sex ratio of founding individuals, but executed different breeding strategies: (1) unmanipulated mating in semi–free range natural habitat versus (2) minimising mean kinship in large enclosures, with the supplementation of new individuals into both populations. This study evaluates the long-term genetic impact of these programs and examines the congruency between the pedigree studbook estimates of diversity and molecular data. Our data demonstrate that genetic diversity was maintained in both populations, with the supplementation of new individuals contributing to the gene pool. The studbook estimates of diversity and inbreeding are not consistent with the microsatellite data and should not solely be relied upon to evaluate the genetic health of captive populations. Our analyses suggest that captive breeding programs may not require costly and intensive management to effectively maintain long-term genetic diversity in a promiscuous species.

scholarly journals Reproductive patterns of bogue, Boops boops (Sparidae), in the southeastern Adriatic Sea

2017 ◽  
Vol 58 (1) ◽  
pp. 117-125
Author(s):  
Tatjana Dobroslavić ◽  
Renata Mozara ◽  
Branko Glamuzina ◽  
Vlasta Bartulović
Keyword(s):  
Total Population ◽  
Adriatic Sea ◽  
Condition Factor ◽  
Gonadosomatic Index ◽  
Gonad Development ◽  
Size Class ◽  
Oocyte Diameter ◽  
Allometric Growth ◽  
Monthly Distribution ◽  
Boops Boops

The reproductive characteristics of bogue (Boops boops) in the southeastern Adriatic Sea are presented in this study. The analysis is based on 676 specimens caught by seine net from December 2011 to November 2012. Total length of females ranged from 13.3 to 29.3 cm and males from 15.1 to 26.3 cm. The overall sex ratio of females to males was 1:0.85 (χ2=4.314; P &lt; 0.05) with a slightly higher number of females in the largest size class. Length-weight relationship for the total population indicated negative allometric growth (b=2.911). Values of the condition factor are relatively low for both sexes. Maximum values were recorded in September 1.025 for females and 1.029 for males. Gonadosomatic index and histological examination showed that the spawning season of the bogue in the Adriatic is from January to May with peak in February. Six stages of gonad development were identified: immature, undergoing maturation, ripening, ripe, spawning and spent. The monthly distribution of the different sexual maturity stages and the frequency distribution of oocyte diameter revealed that this species is a batch spawner.

scholarly journals Temporal Dynamics of Reproduction inHemiramphus brasiliensis(Osteichthyes: Hemiramphidae)

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Mônica Rocha de Oliveira ◽  
Sathyabama Chellappa
Keyword(s):  
Coastal Waters ◽  
Sexual Maturity ◽  
Temporal Dynamics ◽  
Gonadosomatic Index ◽  
Gonad Development ◽  
Reproductive Period ◽  
Northeastern Brazil ◽  
Histological Studies ◽  
Multiple Spawner ◽  
Maturation Stages

The reproductive aspects ofHemiramphus brasiliensiswere analyzed with a view to verify the temporal dynamics of reproduction. This paper presents data on sex ratio, length at first sexual maturity, macroscopic and histological aspects of gonad development, gonadosomatic index (GSI), reproductive period, and fecundity ofH. brasiliensis. The fishes were captured from the coastal waters of Rio Grande do Norte, northeastern Brazil. Females of this species predominated in the sampled population and were larger in size than the males. The length at the first sexual maturation of males was 20.8 cm and that of females was 21.5 cm. The macroscopic characteristics of the gonads indicated four maturation stages. Histological studies of gonads ofH. brasiliensisshowed six phases of oocyte development and four phases of spermatocyte development. The batch fecundity of this species was 1153 (±258.22) mature oocytes for 50 g body weight of female. The microscopic characteristics of gonad development indicate thatH. brasiliensisis a multiple spawner, presenting a prolonged reproductive period during the whole year, with a peak in the month of April, and is considered as an opportunistic strategist.

Effects of Busulfan on Serum Steroid Hormones, GSI, Gonad Development and Sex Reversal in the Asian Swamp Eel (Monoptrus Albus)

2011 ◽  
Vol 382 ◽  
pp. 486-490
Author(s):  
Han Wen Yuan ◽  
Guo Liang Ruan ◽  
Shi Yuan Gong ◽  
Yong Chao Yuan ◽  
Deng Hang Yu ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Gonadosomatic Index ◽  
Gonad Development ◽  
Sex Reversal ◽  
Initial Weight ◽  
Male Ratio ◽  
Group A ◽  
High Doses ◽  
Asian Swamp Eel ◽  
Swamp Eel

This study investigated the effects of busulfan on sex reversal in the Asian swamp eel (Monopterus albus) by evaluating the estradiol (E2) and testosterone (T) concentrations, gonadosomatic index (GSI) and sex ratio. Fish (9.80 ± 1.07 g average initial weight; n = 3 per group) were fed with five diets containing 0 (control), 10, 30, 50 or 70 mg kg-1 dietary busulfan concentrations to apparent satiation for 15 months. Serum E2 and T concentrations were determined by radioimmunoassay techniques. Both E2 and T concentrations were significantly affected by busulfan, while there were no significant differences among the treated groups. Serum E2 concentrations and GSIs decreased, while T concentrations increased with increasing busulfan levels in each group. A shift in the sex ratio towards more male and intersex fish was observed with increasing busulfan contents. The highest male ratio obtained in the 70 mg kg-1 group was significantly different compared to the other groups. High doses of busulfan may induce deformed individuals and high mortality in M. albus. Therefore, busulfan may inhibit gonad development and promote the sex change from female to male M. albus.

scholarly journals Reproductive biology and development of sexually dimorphic structures in Aphyocharax anisitsi (Ostariophysi: Characidae)

2005 ◽  
Vol 3 (3) ◽  
pp. 433-438 ◽  
Author(s):  
Taís K. Gonçalves ◽  
Marco A. Azevedo ◽  
Luiz R. Malabarba ◽  
Clarice B. Fialho
Keyword(s):  
Body Weight ◽  
Gonadosomatic Index ◽  
Total Body Weight ◽  
Reproductive Period ◽  
Day Length ◽  
Positive Correlation ◽  
Young Males ◽  
Absolute Fecundity ◽  
Fin Rays ◽  
Total Body

The reproductive period of Aphyocharax anisitsi is described through the analysis of specimens collected monthly from April 2001 to March 2002 in the arroio do Salso (3022'27"S, 5502'06"W), Rosário do Sul, Rio Grande do Sul, Brazil. The monthly variation of the Gonadosomatic Index mean (GSI) of both males and females allowed the recognition of a defined seasonal reproductive period occurring between September and February, showing a positive correlation with temperature and day-length. Absolute fecundity was 344.8 oocytes and relative fecundity 0.68 oocytes per mg of body weight. Absolute fecundity was correlated with standard length and total body weight. It was possible to identify two categories of males through the analysis of the number of rays bearing hooks on the anal fin: those with few or no rays bearing hooks identified as young males hatched in the last reproductive season, and those with a higher number of anal-fin rays bearing hooks identified as males that had already reproduced once or that are maturing and participating in their first reproductive period. Once developed, anal-fin rays are maintained permanently. A positive correlation was found between the GSI of maturing and mature males and the number of anal-fin rays bearing hooks from August to January. All specimens bearing gill glands were mature or undergoing maturation, and the frequency of occurrence of the gill glands increased with a rise of GSI.

scholarly journals Penggunaan serotonin dalam formulasi hormon pregnant mare serum gonadotropin dan antidopamin untuk menginduksi perkembangan gonad ikan ringau, Datnioides microlepis Bleeker, 1854 [Serotonin application in pregnant mare serum gonadotropin hormone and dopamin antagonist formulation to induce gonadal development of Indonesian tigerfish (Datnioides microlepis Bleeker, 1854)]

2017 ◽  
Vol 17 (1) ◽  
pp. 29
Author(s):  
NFN Bastiar ◽  
Agus Oman Sudrajat ◽  
Melta Rini Fahmi
Keyword(s):  
Plasma Concentration ◽  
Gonadosomatic Index ◽  
Gonad Development ◽  
Gonadal Development ◽  
Hepatosomatic Index ◽  
Small Fish ◽  
Pregnant Mare Serum Gonadotropin ◽  
Randomized Design ◽  
Serum Gonadotropin ◽  
Completely Randomized Design

The objective of study was to analyze the effect of serotonin (5-HT) in the formulation of hormones Pregnant Mare Serum Gonadotropin (PMSG) and dopamin antagonist (AD) hormones to gonad development of tigerfish. This study used completely randomized design (CRD) with five treatments of hormone namely: (P1) 1 ml of 0.9% NaCl (control); (P2) 20 IU PMSG+10 mg AD; (P3) 20 IU PMSG AD+10 mg+0.2 mg 5-HT; (P4) 20 IU PMSG+10 mg AD+2 mg 5-HT; and (P5) 20 IU PMSG+10 mg AD+4 mg 5-HT. Each treatment was tested on five fish as individual replications. Hormone injected intramuscularly at the lower part of the dorsal fin of fish every 10 days. The fish were reared for 60 days. Fish that were used at this study were originate from natural catches as much as 25 fishes with 17.5-33.0 cm of total length and 118-926 g of body weight. During the study, fish fed using shrimp and small fish (live) twice daily at satiation. Measured parameters were gonadosomatic index (GSI), hepatosomatic index (HSI), 17P-estradiol (E2) plasma concentration and gonad maturity level based on morphology and histology examination. The results showed that the use of 2 mg of 5-HT are added to 20 IU PMSG and 10 mg AD (treatment P4) has stimulated the fish to had the highest GSI (2.38 ± 0.06%) and HSI (3,09±0,12%) which was significantly different to other treatment. The treatment (P4) could increase the E2 plasma concentration (37.14±2.99 pg.ml-1) two fold compared with the concentration before injection and stimulated the gonadal development to stage III. AbstrakPenelitian ini bertujuan untuk menganalisis pengaruh penggunaan serotonin (5- hydroxytryptamine atau 5-HT) dalam formulasi hormon Pregnant Mare Serum Gonadotropin (PMSG) dan antidopamin (AD) terhadap perkembangan gonad ikan ringau. Penelitian ini menggunakan rancangan acak lengkap dengan lima perlakuan (dosis.kg-1 bobot tubuh ikan): (P1) 1 ml NaCl 0,9% (kontrol); (P2) 20 IU PMSG+10 mg AD; (P3) 20 IU PMSG+10 mg AD+0,2 mg 5-HT; (P4) 20 IU PMSG+10 mg AD+2 mg 5-HT; dan (P5) 20 IU PMSG+10 mg AD+4 mg 5-HT. Setiap perlakuan diujikan pada lima ekor ikan sebagai ulangan individu. Penyuntikan hormon dilakukan setiap 10 hari dengan lama penelitian 60 hari. Hormon disuntikkan secara intramuskular pada bagian bawah sirip punggung ikan uji. Ikan yang digunakan merupakan hasil tangkapan alam dengan ukuran panjang total 17,5-33,0 cm dan bobot tubuh 118-926 g. Selama penelitian, ikan uji diberi pakan berupa udang dan ikan-ikan kecil (hidup) dua kali sehari secara satiasi. Parameter yang diamati adalah indeks kematangan gonad, indeks hepatosomatik, konsentrasi estradiol-17p plasma dan tingkat kematangan gonad berdasarkan morfologi dan histologi gonad. Hasil penelitian menunjukkan penggunaan 2 mg 5-HT dalam 20 IU PMSG dan 10 mg AD (perlakuan P4) menghasilkan perkembangan gonad yang lebih baik dibandingkan perlakuan lainnya. Nilai indeks kematangan gonad, indeks hepatosomatik, dan konsentrasi E2 plasma tertinggi diperoleh pada perlakuan P4 dengan nilai masing-masing sebesar 2,38±0,06%; 3,09±0,12% dan 37,14±2,99 pg.ml-1. Nilai tersebut berbeda nyata p<0.05) dengan perlakuan lainnya. Perlakuan P4 meningkatkan konsentrasi E2 plasma dua kali lebih besar dibanding-kan sebelum penyuntikan serta menghasilkan perkembangan gonad yang mencapai tingkat kematangan gonad tahap III.

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