scholarly journals Gonad development and reproduction of the ballyhoo half beak, Hemiramphus brasiliensis from the coastal waters of Rio Grande do Norte, Brazil

2015 ◽  
Vol 75 (2) ◽  
pp. 324-330
Author(s):  
MR. Oliveira ◽  
NB. Silva ◽  
ME. Yamamoto ◽  
S. Chellappa
Keyword(s):  
Coastal Waters ◽  
Sexual Maturity ◽  
Gonad Development ◽  
Rio Grande ◽  
Reproductive Period ◽  
Batch Fecundity ◽  
Histological Studies ◽  
Rainy Period ◽  
Multiple Spawner ◽  
Maturation Stages

The gonad development and reproductive aspects of Hemiramphus brasiliensis from the coastal waters of Rio Grande do Norte, Brazil were verified. This paper presents data on the length-weight relationship, sex ratio, length at first sexual maturity, gonad development, reproductive period and fecundity of H. brasiliensis. 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 of H. brasiliensis showed six phases of oocyte development and four phases of spermatocyte development. The batch fecundity of this species is 1153 (±258.22) oocytes for 50 g body weight of female. The microscopic characteristics of gonad development indicate that H. brasiliensis is a multiple spawner, with active reproductive period during the months of January to June and October. The reproductive period of this species is independent of the rainy period of the region.

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.

scholarly journals Reproductive period and fecundity of Serrapinnus piaba (Characidae: Cheirodontinae) from the rio Ceará Mirim, Rio Grande do Norte, Brazil

2003 ◽  
Vol 1 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Jacira Silvano ◽  
Cristina L. C. Oliveira ◽  
Clarice B. Fialho ◽  
Hélio C. B. Gurgel
Keyword(s):  
Gonadosomatic Index ◽  
Rio Grande ◽  
Total Body Weight ◽  
Mature Female ◽  
Reproductive Period ◽  
Day Length ◽  
Maturation Stages ◽  
Total Body ◽  
Spearman Test ◽  
Test Correlation

Specimens of Serrapinnus piaba were collected monthly from April 2001 to April 2002 in the rio Ceará Mirim, Rio Grande do Norte State, Brazil. The reproductive period, determined through the monthly variation of the gonadosomatic index (GSI) and maturation stages, occurred from January to April. Non-parametric Spearman test was performed in order to test correlation of monthly GSI variation in males and females with water temperature, rainfall and day length. Rainfall and Temperature were correlated with GSI variation in females only and day length showed a negative correlation with GSI variation of males only. It was verified the presence of hooks on the anal fin of mature and maturing males along all the period of study. The absolute fecundity mean was 441 (±178.08) oocytes, determined by the number of yolky oocytes counted in 27 mature female gonads. The relative fecundity, estimated by the number of yolky oocytes divided by milligram of total body weight was 0.74 (± 0.19).

scholarly journals Reproductive indicators of the endemic species Astyanax bifasciatus (Teleostei: Characidae) in a tributary of the Lower Iguaçu River Basin, Brazil

2019 ◽  
Vol 41 ◽  
pp. e47720
Author(s):  
Elton Celton de Oliveira ◽  
Alexandre Augusto Auache-Filho ◽  
Denis Damasio ◽  
Nédia de Castilhos Ghisi ◽  
Maria Antônia Michels-Souza
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Sexual Maturity ◽  
Gonadosomatic Index ◽  
Reproductive Period ◽  
Maturity Stage ◽  
Reproductive Process ◽  
Maturation Stages ◽  
High Degree ◽  
Iguaçu River

The reproductive process promotes morphophysiological and behavioral changes in fish species throughout their life cycle. Its success is vital to define their resilience in the environment. This study aimed to evaluate the reproductive biology of the endemic fish species Astyanax bifasciatus in a tributary of the Lower Iguaçu River Basin, Paraná, Brazil. Fish were collected monthly at four sites along the Jirau Alto River in the city of Dois Vizinhos from October 2015 to September 2016. A standardized catch effort with gill nets and fish traps was used. In the laboratory, standard length and total weight were recorded. After anesthesia, the animals were sectioned to macroscopically determine the sex, sexual maturity stage, and presence of celomatic fat. The gonads and liver were removed to determine the gonadosomatic and hepatosomatic indexes, respectively. A total of 160 individuals (104 females and 56 males) were used. The gonadosomatic index, frequency of the gonadal maturation stages, and condition factor showed a long reproductive period with two investment cycles for both sex. Length at first sexual maturity was 4.57 cm for females and 3.56 cm for males. The reproductive data corroborate the generalist profile of the species and demonstrate a high degree of adaptive capacity, even in smaller tributaries.

scholarly journals Reproductive aspects of the flyingfish, Hirundichthys affinis from the Northeastern coastal waters of Brazil

2015 ◽  
Vol 75 (1) ◽  
pp. 198-207 ◽  
Author(s):  
MR. Oliveira ◽  
MM. Carvalho ◽  
NB. Silva ◽  
ME. Yamamoto ◽  
S. Chellappa
Keyword(s):  
Sex Ratio ◽  
Coastal Waters ◽  
Sexual Maturity ◽  
Total Body Length ◽  
Gonadal Development ◽  
Biological Information ◽  
Gonad Maturation ◽  
Fishery Resource ◽  
Maturation Stages ◽  
Total Body

The epipelagic flyingfish, Hirundichthys affinis is a major artisanal fishery resource from the Northeastern coastal waters of Brazil. However, biological information about this species has been poorly documented. This paper presents data on the length-weight relationship, sex ratio, length at first sexual maturity, gonadal development and fecundity of H. affinis sampled from the coastal waters of Rio Grande do Norte, Brazil. The total body length and weight for both sexes ranged from 23.4 to 29.4 cm and from 89 to 188g, respectively. The allometric coefficient of males was 2.208 and that of females was 2.985, indicating negatively allometric growth. The sex ratio was 1M:1.6F thus differing from the expected ratio of 1:1 (χ2 = 18.63). The total length at first sexual maturity was estimated at 27.3 cm for males and 27.1 cm for females. The macroscopic characteristics of the gonads indicated four maturation stages. Histological studies of gonads of H. affinis showed seven phases of oocyte development and four phases of spermatocyte development. The mean absolute fecundity was 9092 vitelogenic oocytes. Spawning occurred during the months of March to July. The microscopic descriptions of the stages of gonad maturation indicate that the study area is an important spawning ground of H. affinis.

scholarly journals Reproductive biology of Bryconamericus stramineus Eigenmann, 1908 (Ostariophysi: Characidae) from the Rio Ibicuí, RS, Brazil

2007 ◽  
Vol 50 (6) ◽  
pp. 995-1004 ◽  
Author(s):  
Vinicius Renner Lampert ◽  
Marco Aurélio Azevedo ◽  
Clarice Bernhardt Fialho
Keyword(s):  
Reproductive Period ◽  
Day Length ◽  
Hepatosomatic Index ◽  
Weak Correlation ◽  
Gonadal Maturation ◽  
Multiple Spawner ◽  
Fin Ray ◽  
Maturation Stages ◽  
Index Rainfall ◽  
The Mean

Reproduction of Bryconamericus stramineus was described based on the analysis of 208 females and 166 males collected monthly in the Rio Ibicuí, from April 2001 through March 2002. Reproduction occurred between September and December, with a lower peak in February. The mean absolute fecundity was 371.3 (± 244.6) oocytes and the mean relative fecundity was 0.35 (± 0.08) oocytes/mg of total weight and the fish was a multiple spawner. A weak correlation between GSI of males and day length was observed. Other parameters (stomach repletion and hepatosomatic index, rainfall and temperature) did not show any correlation with GSI. However, some of these factors might act as "starters" of gonadal maturation. The presence and frequency of fin ray hooks on the males was compared with the gonadal maturation stages, months and standard length classes. Well-developed hooks were found mainly in the mature males during the reproductive period and in the largest individuals.

scholarly journals Reproductive Biology of Round Sardinella (Sardinella Aurita) (Valenciennes, 1847) in Senegalese Coastal Waters

2018 ◽  
Vol 9 (1) ◽  
pp. 31
Author(s):  
Ismaïla NDIAYE ◽  
Alassane SARR ◽  
Alioune FAYE ◽  
Modou THIAW ◽  
Malick DIOUF ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Reproductive Biology ◽  
Coastal Waters ◽  
Sexual Maturity ◽  
Reproductive Parameters ◽  
Monthly Variation ◽  
Relative Fecundity ◽  
The Mean ◽  
Sardinella Aurita ◽  
Somatic Index

In this study, a total of 1068 specimens Sardinella aurita of which 553 females and 515 males were examined. The objectif of this study was to determine the reproductive parameters of Sardinella aurita. The sex ratio was significantly in favor of females (55%). The size at first sexual maturity was estimated at 18.9 cm for females and 18.0 cm for males. The monthly variation of sexual maturity stages and gonado-somatic index (GSI) allowed to locate the reproduction periods from February to June and from September to December. The mean absolute fecundity was estimated at 110.794 ± 7582 oocytes whereas relative fecundity was about 422 ± 26 oocytes per gram of female.

scholarly journals BIOLOGI REPRODUKSI TUNA MATA BESAR (Thunnus obesus) YANG TERTANGKAP DI SAMUDERA HINDIA

2017 ◽  
Vol 3 (2) ◽  
pp. 129
Author(s):  
Ria Faizah ◽  
Budi Iskandar Prisantoso
Keyword(s):  
Indian Ocean ◽  
Gonad Development ◽  
Morphological Structure ◽  
Maturity Stage ◽  
Batch Fecundity ◽  
Gonad Maturity ◽  
Thunnus Obesus ◽  
The Indian Ocean ◽  
Index Value ◽  
Somatic Index

Tujuan penelitian ini adalah untuk mendapatkan informasi mengenai aspek reproduksi ikan tuna mata besar (Thunnus obesus) di perairan Samudera Hindia. Sebanyak 42 contoh gonad dari ikan tuna mata besar yang tertangkap perairan Samudera Hindia antara bulan Maret sampai Oktober 2008 digunakan dalam penelitian ini. Pengamatan meliputi struktur morfologi gonad ikan, perkembangan gonad, diameter telur, dan fekunditas. Hasil penelitian ini menunjukan bahwa ikantuna mata besar yang tertangkap memiliki tingkat kematangan gonad I, II, dan IV. Nilai gonado somatic index rata-rata tuna mata besar semakin meningkat seiring dengan meningkatnya tingkat kematangan gonad. Musim pemijahan untuk tuna mata besar diduga terjadi pada bulan Oktober. Tuna mata besarmemiliki fekunditas antara 8.163.715-10.365.317 butir dan memiliki pola pemijahan berganda. The objective of this research is to study the reproductive biology of big eye tuna (Thunnus obesus) from Indian Ocean. A numbers of 42 gonad samples were taken from fresh individuals captured in the Indian Ocean during period of March until October 2008. The observation comprised of morphological structure of gonad, gonad development, oocytes diameter, and batch fecundity. The results showed that the gonad maturity stages of big eye tuna were ranged from immature (the gonad maturity stage of I and II) to mature (the gonad maturity stage of IV), and the gonado somatic index value increase along with increase of gonad maturity. Spawning season for big eye tuna estimated was in October, range of fecundity were 8.163.715-10.365.317 oocytes, and the spawning type waspartial spawned.

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