Reproductive biology of the freshwater catfish, Tandanus tandanus Mitchell, in the Gwydir River, Australia. II. Gonadal cycle and fecundity

1977 ◽  
Vol 28 (2) ◽  
pp. 159 ◽  
Author(s):  
TLO Davis
Keyword(s):  
Reproductive Biology ◽  
Egg Size ◽  
Fish Length ◽  
Gonad Weight ◽  
Spawning Period ◽  
Male And Female ◽  
Freshwater Catfish ◽  
Lower Weight ◽  
Fish Weight ◽  
Egg Diameter

All male and female T. tandanus in the Gwydir River were mature at age V and at a weight of 1200 g, although some females matured at an earlier age and lower weight than males. The seasonal gonadal cycle as indicated by gonad weight, egg size and maturity stages revealed that the spawning period in the Gwydir River extended from January to the beginning of March. Egg diameter increased linearly with fish length and weight. Ripe eggs ranged from 2.28 to 3.05 mm while fish weight ranged from 675 to 2275 g. Fecundity increased linearly with fish weight and exponentially with fish length. Egg numbers per female ranged from 2000 to 20 600 eggs while fish weight ranged from 675 to 2275 g. Egg size also increased with increasing fecundity. Temperature in excess of 24�C appeared to be the primary factor stimulating spawning. Flooding was not required as a stimulus for spawning.

scholarly journals Reproductive Biology of Splendid Ponyfish Leiognathus splendens (Cuvier, 1829) in Myeik Coastal Waters, Myanmar

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Khin May Chit Maung ◽  
Phan Minh-Thu ◽  
Nyo Nyo Tun
Keyword(s):  
Reproductive Biology ◽  
Coastal Waters ◽  
Gonadosomatic Index ◽  
Fish Length ◽  
Gonad Weight ◽  
Fish Weight ◽  
The Mean ◽  
First Maturity ◽  
Relationship Of ◽  
Trawl Fisheries

Reproductive biology of Leiognathus splendens was studied by using the samples collected from the catches of trawl fisheries in Myeik coastal waters during January to December 2014. Spawning takes place throughout the year, with a peak during April-May and September-December. The observed length at first maturity was 9.0 cm total length in males and 8.4 cm in females. The mean gonadosomatic index was more prominently in females (2.5) than males (1.5). Sex ratio (1 male: 1.1 females) also indicates the general dominant of females over males  Fecundity varied from 6120 to 58412 eggs. Relationship of fecundity to fish length, fish weight and ovary weight showed that fecundity is more related to the gonad weight (r=0.9) than length (r=0.8) and weight of fish (r=0.7)

scholarly journals Reproductive characteristics of Liza parsia (Ham.) inhabiting southwest coast of Bangladesh

1970 ◽  
Vol 8 (1) ◽  
pp. 173-178 ◽  
Author(s):  
M Begum ◽  
MA Islam ◽  
HK Pal ◽  
MJ Alam
Keyword(s):  
Sex Ratio ◽  
Gonadosomatic Index ◽  
Fish Length ◽  
Gonad Weight ◽  
Reproductive Characteristics ◽  
Linear Relationships ◽  
Fish Weight ◽  
Reproduction Period ◽  
Two Peaks ◽  
Egg Diameter

In order to determine the reproductive characteristics of Liza parsia, a fish of commercial importance, the GSI, egg diameter, sex ratio and fecundity were examined in 331 specimens caught monthly for a period of ten months from September 2006 to June 2007. According to the GSI and egg diameter, the reproduction period of Liza parsia was determined to be in November to March with two peaks in the months of December and February. The maximum GSI values obtained for male and female were 1.49 and 14.71 respectively in the month of February. In December, the gonadosomatic index decreased in female (13.5) and in male (1.4). The average egg diameter of Liza parsia ranged from 0.35 to 0.50 mm. The sex ratio (Male:Female) of the investigated fish was1:1.21. Fecundity of the fish ranged from 18,950 to 1,71,210 during the period of study. Linear relationships between fecundity and total-length, bodyweight, gonad-length and gonad-weight were found and fecundity was more related to the ovary length (r=0.8172) and ovary weight (r=0.8552) than the fish length (r=0.7538) and fish weight (r=0.7592). Keywords: Reproductive characteristics; Liza parsia; GSI; Fecundity DOI: 10.3329/jbau.v8i1.6415J. Bangladesh Agril. Univ. 8(1): 173-178, 2010

scholarly journals Reproductive Biology of Splendid Ponyfish Leiognathus Splendens (Cuvier, 1829) in Myeik Coastal Waters, Myanmar

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Khin May Chit Maung ◽  
Phan Minh-Thu ◽  
Nyo Nyo Tun
Keyword(s):  
Reproductive Biology ◽  
Coastal Waters ◽  
Gonadosomatic Index ◽  
Fish Length ◽  
Gonad Weight ◽  
Fish Weight ◽  
The Mean ◽  
First Maturity ◽  
Relationship Of ◽  
Trawl Fisheries

Reproductive biology of Leiognathus splendens was studied by using the samples collected from the catches of trawl fisheries in Myeik coastal waters during January to December 2014. Spawning takes place throughout the year, with a peak during April-May and September-December. The observed length at first maturity was 9.0 cm total length in males and 8.4 cm in females. The mean gonadosomatic index was more prominently in females (2.5) than males (1.5). Sex ratio (1 male: 1.1 females) also indicates the general dominant of females over males  Fecundity varied from 6120 to 58412 eggs. Relationship of fecundity to fish length, fish weight and ovary weight showed that fecundity is more related to the gonad weight (r=0.9) than length (r=0.8) and weight of fish (r=0.7)

The reproductive biology of deep-sea forcipulate seastars (Asteroidea: Echinodermata) from the N.E. Atlantic Ocean

1984 ◽  
Vol 64 (3) ◽  
pp. 587-601 ◽  
Author(s):  
P. A. Tyler ◽  
S. L. Pain ◽  
J. D. Gage ◽  
D. S. M. Billett
Keyword(s):  
Atlantic Ocean ◽  
Reproductive Biology ◽  
Deep Sea ◽  
Egg Size ◽  
Dorsal Surface ◽  
Oocyte Diameter ◽  
Interspecific Variations ◽  
Egg Diameter

Samples of the deep-sea forcipulate seastars Brisinga endecacnemos, Brisingella coronata, Freyella spinosa and Zoroaster fulgens have been collected at a number of stations in the N.E. Atlantic. Examination of their reproductive biology suggests subtle interspecific variations in their gametogenic cycles. The gonads of Brisinga endecacnemos are serially arranged under the dorsal arm surface, each cluster of gonad tubules having its own gonopore. In the closely related Brisingella coronata each gonad consists of up to 12 elongate tubules opening at a single gonopore at the dorsal surface. In both species the maximum egg diameter is about 1250 μm and fecundity may be up to 60000 eggs per individual. It appears that the eggs in Brisinga endecacnemos are produced in clusters whilst those of Brisingella coronata are produced continuously. InFreyella spinosa the gonad consists of a small tubular sac analogous to a single tubule of Brisinga endecacnemos. Maximum fecundity is only 2500 eggs per individual, and the maximum egg size is 1250 μm. In all three species eggs that are not spawned undergo internal oocyte degeneration. The gonads of Zoroaster fulgens show the typical asteroid configuration of two at the base of each arm, one either side of the ambulacrum. The maximum oocyte diameter is 950 μm. There is some evidence that there may be a seasonality of reproduction in this species. In all four species examined the large egg size and relatively low fecundity suggest direct demersal development with the subtle variations in their reproductive biology reflecting slightly different breeding habits.

scholarly journals Some Aspects of Reproductive Biology of the Mudskipper Apocryptes Bato From the Coast of Chitagong

2018 ◽  
Vol 44 (1) ◽  
pp. 91-99
Author(s):  
Mohammed Sadequer Rahman ◽  
Md Sohel Parvez ◽  
Mohammad Mizanur Rahman ◽  
Md Rashed Un Nabi ◽  
Md Wahidul Alam
Keyword(s):  
Reproductive Biology ◽  
Coastal Waters ◽  
Spawning Season ◽  
Gonad Weight ◽  
Male And Female ◽  
Length Standard ◽  
Significant Coefficient ◽  
The Right ◽  
T Values ◽  
Relationship Of

Some aspects of reproductive biology of the mudskipper Apocryptes bato (Hamilton 1822) from the coastal waters of Chittagong, Bangladesh was conducted. Disproportionate occurrence of male and female (1.20 : 1) was observed in the number of two sexes. A prolonged spawning season was found from June to early October with a single peak. The aspects in the ovary indicate one complete spawning of females in a single spawning season. The fecundity was found to vary from 7453 - 31195 with an average of 17590 ± 6867. Significant coefficient of correlation between the diameters of the eggs of corresponding anterior, middle and posterior regions of the right and left ovaries indicated the simultaneous release of eggs from both the ovaries. A much closer relationship of fecundity and the significant ‘t’ values indicated fecundity increases with the increase of total length, standard length, body weight and gonad weight. Asiat. Soc. Bangladesh, Sci. 44(1): 91-99, June 2018

scholarly journals Reproductive biology of silurid catfishes Ompok miostoma (Vaillant 1902) in Mahakam River East Kalimantan

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
. Jusmaldi ◽  
Dedy Duryadi Solihin ◽  
Ridwan Affandi ◽  
MF Rahardjo ◽  
Rudhy Gustiano
Keyword(s):  
Sex Ratio ◽  
Reproductive Biology ◽  
Spawning Season ◽  
Spawning Period ◽  
Male And Female ◽  
Gonad Maturity ◽  
East Kalimantan ◽  
Fish Samples ◽  
Total Fish ◽  
Somatic Index

Reproductive biology of silurid catfish O.miostoma(Vaillant 1902)as one of endemic species in Mahakam River East Kalimantan is not yet known. This study aimed to analysisreproductive aspect related to changing seasons, including sex-ratio, spawning season, spawning location, length at first gonad maturity, gonado-somatic index, and fecundity. Total fish samples (n=1214)were collected monthly from November 2013 to October 2014 at four locations in the Mahakam River, using many fishing gears.The results of this research showthe total length of fish ranged from 132.19 to 227.30 mm and weight ranged from 20.00 to 70.40 g. The overall sex ratio of male and female was1: 1.56, while at gonad maturity stages were1:1.77. The spawning season range from November to January and peak spawning occurs in December. The highest spawning location was found at swamp flood Semayang Lake. The length at first gonad maturity of male ranged of 191.05-202.60 mm, while it was in 179.56-198.50 female. Maximum average gonado-somatic index (GSI) values obtained for male and female were 0.32 and 2.07 respectively during spawning period in November and declined to minimum in February. The total fecundity and eggs diameter rangedfrom 2648 to 12495 eggsind-1and 0.61 to 1.30 mm respectively. There was a positive correlation between fecundity andtotal length and weightof fishes.AbstrakBiologi reproduksi ikan lais O. miostoma (Vaillant 1902)sebagai salah satu spesies endemik di Sungai Mahakam Kalimantan Timur belum pernah diketahui. Tujuan penelitian ini adalah menganalisisaspek reproduksi ikan laisberkaitan dengan perubahan musimyang mencakupnisbah kelamin, musim pemijahan, lokasi pemijahan, ukuran kali pertama matang gonad, indeks kematangan gonad dan fekunditas.Total ikan contoh 1214 ekor telah dikumpulkan setiap bulan mulai dari bulan November 2013 sampai Oktober 2014di empat lokasi perairan Sungai Mahakam, menggunakan berbagai alat tangkap. Hasil penelitian menunjukkanukuran panjang total ikan berkisar dari 132,19-227,30 mm dan bobot berkisar dari  20,00-70,40 gram.Nisbah kelamin seluruh ikan jantan dan betina yang diamati 1 : 1,56, sedangkanpada tahap kematangan gonad 1:1,77. Musim pemijahan terjadi mulai dari bulan November sampai Januari dan puncak pemijahan pada bulan Desember. Lokasi pemijahan tertinggi ditemukan di rawa banjiran Danau Semayang. Ukuran ikan pertamamatang gonad pada jantan berkisar dari 191,05-202,60 mm dan betina berkisar dari 179,56-198,50 mm. Rata-rata indeks kematangan gonad (IKG)  tertinggi ditemukan pada jantan dan  betina berturut turut 0,32  dan 2,07 selama musim pemijahanpada bulan November dan menurun hingga terendah pada bulan Februari. Fekunditas total berkisar dari 2.648-12.495 butir telur per individu.Ada korelasi positif antara fekunditas dengan panjang total dan bobot ikan.

scholarly journals Reproductive Characteristics of the Pond-Farmed Sultan Fish (Leptobarbus hoevenii)

2021 ◽  
Vol 13 (2) ◽  
pp. 171
Author(s):  
Sajeenuth Srithongthum ◽  
Hsein-Loong Au ◽  
Thumronk Amornsakun ◽  
Poramat Musikarun ◽  
Wen Jye Mok ◽  
...  
Keyword(s):  
Body Weight ◽  
Class Group ◽  
Gonadosomatic Index ◽  
Asian Countries ◽  
Gonad Weight ◽  
Male And Female ◽  
Reproductive Characteristics ◽  
Multiple Spawner ◽  
Egg Diameter ◽  
Southeast Asian Countries

Highlight ResearchThe reproductive characteristics of L. hoevenii were examinedThe potentially smallest maturity sizes of female and male L. hoevenii were 350 g and 180 g, respectivelyThe fecundity of a 1,000 g L. hoevenii can be more than 100,000 eggsL. hoevenii was determined as a multiple spawnerAbstractSultan fish (Leptobarbus hoevenii) is a high value freshwater fish, cultured in some Southeast Asian countries, including Malaysia and Thailand. However, information on its reproductive characteristics is very scarce. This study examined the gonadosomatic index (GSI), fecundity, egg diameter, and determined whether L. hoevenii is a single- or multiple-spawner. Twenty male and female pond-farmed L. hoevenii broodstock were obtained to measure their total length (TL), body weight (BW) and gonad weight to calculate the GSI. Ten females were randomly sampled from the 20 to determine their fecundity. A total of 1,500 eggs were sampled from each female. The egg diameter was measured then its frequency distribution was analyzed to detect the number of egg class group, and to determine whether L. hoevenii is a single- or multiple spawner. The female L. hoevenii examined were 32.2-47.1 cm and 350-1,200 g, while the males were 30.7-45.8 cm and 180-970 g in TL and BW, respectively. All female specimens contained gonads. The potentially smallest mature samples were recorded at 350 g (female) and 180 g (male). GSI for the female and male L. hoevenii were 1.81-12.28 % and 1.03-5.09 %, respectively. The fecundity was 35,467 -128,067 eggs, while the highest fecundity was observed in a 1,000 g fish. The observed egg diameter ranged from 500 to 1,855 μm. Two to five groups of egg class were detected, indicating that L. hoevenii is a multiple spawner.

scholarly journals ASPECTS OF REPRODUCTIVE BIOLOGY AND ABUNDANCE OF AFRICAN BONYTONGUE (HETEROTIS NILOTICUS) IN GREAT KWA RIVER, NIGERIA

2020 ◽  
Vol 1 (1) ◽  
pp. 55-65
Author(s):  
N. U. Ikot ◽  
S. B. Ekanem ◽  
V. O. Eyo
Keyword(s):  
Reproductive Biology ◽  
Sustainable Management ◽  
Gonadosomatic Index ◽  
Total Weight ◽  
Hepatosomatic Index ◽  
Gonad Weight ◽  
Female Population ◽  
Total Length ◽  
Egg Diameter ◽  
The Relationship

This study was conducted to evaluate some aspects of the reproductive biology of the African Bonytongue Heterotis niloticus from the Great Kwa River, Cross River State Nigeria with the view to encourage conservation and rational measures for sustainable management of the species. A total of 62 matured H. niloticus were sampled and their gonadosomatic index (GSI), hepatosomatic index (HSI), condition factor, fecundity and egg diameter (mm) were studied in other to determine the spawning season of the fish. Gonadosomatic index and hepatosomatic index showed an inverse relationship during spawning seasons. Total length (TL-cm) ranged between 47.1 cm – 76.2 cm and total weight (TW – g) ranged between 4300g - 1169g with sex ratio of 1:1.2 (male: female) revealing a dominant female population. Fecundity ranged from 511 oocytes (48.4cm TL; 1.69 kg wt, 5.9g gonad weight) to 7822 oocytes (69.3cm TL, 3.11kg wt. 14.9g gonad weight). The regression equation derived from the scattered diagram in the relationship between fecundity and total weight, total length gonadosomatic index and length-weight is; F= 6.6231TW0.837, R2= 0.2456; F= 5.1112TL1.6367,  R2= 0.1606; F= 10680GSI0.9276, R2= 0.6567; TW= 0.4072TL2.0987, R2= 0.7533, the relationship were significant (p < 0.05). Fecundity and ovary weight relationship showed a positive correlation coefficient of 1. The highest egg diameter (0.92±0.01) was recorded in May and other months with corresponding high gonadosomatic index performance to confirm spawning period. In view to encourage conservation by investigating measures for sustainable management of the species, this study observed that H. niloticus spawns throughout the year. Ikot, N. U. | Department of Zoology and Environmental Biology, University of Calabar, P.M.B.1115 Calabar, Nigeria

Reproductive Cycle of the Endangered Sarpunti, Puntius sarana (Hamilton, 1822) in Bangladesh

2007 ◽  
Vol 20 (2) ◽  
Author(s):  
B.K. CHAKRABORTY ◽  
Z.A. MIRZA ◽  
M.I. MIAH ◽  
M.A.B. HABIB ◽  
A. CHAKRABORTY
Keyword(s):  
Histological Analysis ◽  
Developmental Stages ◽  
Maturation Stage ◽  
Gonad Weight ◽  
Spawning Period ◽  
Male And Female ◽  
Development Stages ◽  
Spawning Time ◽  
Puntius Sarana ◽  
Somatic Index

Successive developmental stages of both male and female gonads and estimation of gonado-somatic index (GSI) of Puntius sarana (Hamilton 1822) were investigated over a two year period (October 2002 to September 2004). From the histological analysis, four developmental stages such as spermatogonia, spermatocytes, spermatids and spermatozoa were identified in testes. Three developmental stages of oocytes such as ogenesis (oogonia, early perinucleolus stage and late early perinucleolus stage), vitellogenesis (early vitellogenic oocytes, advanced vitellogenic oocytes and maturation stage) and atretic stage were distinguished in ovaries. Maximum mean gonad weight was recorded in June for both females (8.92±0.01 g) and males (4.48±0.21 g). The testes at early development stages between October and March contained mostly spermatogonia, spermatocytes and spermatids, although a small amount of spermatozoa was also found in late March. The mature testes began to develop in early April and were prominent from May to September. Highest percentage of oogonia in the ovary was recorded in the month of November; while the highest percentages of early perinucleolus stage and late perinucleolus stage were recorded in the month of January. Vitellogenesis (matured oocytes) occupied the most areas of the ovaries which were observed from May to mid September but was prominent in June. All oocytes did not mature at the same time. Only the matured oocytes ovulated in the spawning period while immature oocytes gained maturation under way of vitellogenesis and released at the second spawning time in the months of August and September.

Variation with Fish Length, Sex, Stage of Sexual Maturity, and Season in the Appearance and Volume of the Drumming Muscles of the Swim-Bladder in the Haddock, Melanogrammus aeglefinus (L.)

1958 ◽  
Vol 15 (3) ◽  
pp. 355-390 ◽  
Author(s):  
Wilfred Templeman ◽  
V. M. Hodder
Keyword(s):  
Sexual Maturity ◽  
Low Frequency ◽  
Mature Male ◽  
Melanogrammus Aeglefinus ◽  
Fish Length ◽  
Swim Bladder ◽  
Secondary Importance ◽  
Spawning Period ◽  
Male And Female ◽  
The Difference

Observations made as early as 1947 and data collected in 1953 to 1954 and 1956 to 1957 indicate that there is considerable variation in the size and appearance of the drumming muscles of the swim-bladder of haddock with fish length, sex, sexual maturity, and season on the Grand Bank and St. Pierre Bank. For haddock of the same length the data indicate that the drumming muscles of mature male haddock are larger than those of immature males and also of immature and mature females of the same length. In addition the data indicate that a periodicity is exhibited in the size of the muscles of the mature male, the muscles being nearly twice as large during the pre-spawning and spawning period in May and June as they are in October and November. This phenomenon does not occur in female haddock, the drumming muscles of which are considerably smaller than those of male fish of the same size and show no variation in size with the season.It is suggested that the difference in size of the drumming muscles of male and female haddock can serve as a means of determining the sex of haddock landed in the gutted condition by commercial trawlers, at least for the mature fish which make up the bulk of the commercial trawlers' catches. There is some difference between male and female haddock in the colour of drumming muscles, but this seems to be of secondary importance for distinguishing between the sexes.Male haddock probably use the drumming muscles chiefly to produce low-frequency swim-bladder sounds which serve as rallying calls for female and other male haddock to join in spawning activities.

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