Reproductive biology of the silky shark Carcharhinus falciformis in the southern Mexican Pacific

2014 ◽  
Vol 95 (3) ◽  
pp. 561-567 ◽  
Author(s):  
C. Galván-Tirado ◽  
F. Galván-Magaña ◽  
R.I. Ochoa-Báez
Keyword(s):  
Reproductive Biology ◽  
Reproductive Organ ◽  
Seminal Vesicles ◽  
Birth Size ◽  
Mexican Pacific ◽  
Female Reproductive Organ ◽  
Gulf Of Tehuantepec ◽  
Silky Shark ◽  
Carcharhinus Falciformis ◽  
First Maturity

Despite being one of the most abundant and highly exploited species in the Mexican Pacific Ocean, information on the biology of the silky shark, Carcharhinus falciformis is limited. The objective of the present study was to describe the reproductive biology of this species, based on 262 sharks (117 females and 145 males) caught from September 2004 to May 2006 in the Gulf of Tehuantepec, Mexico. The size of females ranged from 70 to 229 cm total length (TL); males measured from 69 to 220 cm TL. Female reproductive organ measurements showed that between 175 and 190 cm TL there was an increase in oviducal gland width (19–45 mm), as well as in uterus size (20–220 mm width). Mature males over 180 cm had calcified claspers, well-developed testes (184–282 mm) and presence of sperm in the seminal vesicles. The estimated length of males at first maturity was 180 cm, and that of females was 190 cm. Ovarian fecundity varied from 4 to 11 oocytes, and uterine fecundity varied from 2 to 14 embryos. We infer that mating occurs between May and June. We did not find sperm storage in the oviducal glands. Birth size was observed to be between 60 and 69 cm TL. No defined gestation period was observed.

Isotopic niches of the blue shark Prionace glauca and the silky shark Carcharhinus falciformis in the southwestern Indian Ocean

2012 ◽  
Vol 17 (1) ◽  
pp. 83-92 ◽  
Author(s):  
N Rabehagasoa ◽  
A Lorrain ◽  
P Bach ◽  
M Potier ◽  
S Jaquemet ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Blue Shark ◽  
Prionace Glauca ◽  
Silky Shark ◽  
Carcharhinus Falciformis ◽  
Southwestern Indian Ocean

Pengetahuan dan Sikap Calon Guru Biologi pada Kesehatan Reproduksi

2013 ◽  
Vol 1 (1) ◽  
Author(s):  
Herlin Andayani ◽  
Lukman Aprizal ◽  
Bambang Hariyadi
Keyword(s):  
Reproductive Health ◽  
Reproductive Biology ◽  
Teacher Candidates ◽  
Uterine Cancer ◽  
Biology Education ◽  
Social Institutions ◽  
Reproductive Organ ◽  
Biology Teacher ◽  
Sexually Transmitted ◽  
Academic Year

Reproductive health is a major problem that occurs in Indonesian adolescents. The problem is caused by some factors, including free sex that could induce reproductive organ diseases such as cervical cancer, ovarian cancer, vulvar cancer, uterine cancer, prostate cancer and sexually transmitted diseases. Incidence of various reproductive health problems is caused by a lack of knowledge about reproductive health. This issue needs to get attention from various parties, including teachers. However, some teachers are less understood about how to deliver reproductive health materials properly. This study aims to determine knowledge and attitudes of teacher candidates about reproductive biology. This study is a descriptive analytic study. The subjects were students of biology education at Jambi University who are in 5th and 7th semesters of academic year 2011/2012 (174 students).  The data was collected using tests and questionnaires. The results show that knowledge of the biology teacher candidates about the reproductive health is categorized as low (43​​%).  The attitude of biology teacher candidates about reproductive biology is classified as positive (64%). The formation of attitudes toward reproductive health is influenced by several factors including knowledge, experience, guidance from parents, social environment, mass media, cultural, and social institutions.

scholarly journals Genetic Architecture of Testis and Seminal Vesicle Weights in Mice

Genetics ◽  
2001 ◽  
Vol 158 (1) ◽  
pp. 333-340 ◽  
Author(s):  
Isabelle Le Roy ◽  
Sylvie Tordjman ◽  
Danièle Migliore-Samour ◽  
Hervé Degrelle ◽  
Pierre L Roubertoux
Keyword(s):  
Seminal Vesicle ◽  
Inbred Strains ◽  
Genome Scan ◽  
Reproductive Organ ◽  
Seminal Vesicles ◽  
Total Variance ◽  
Chromosome 4 ◽  
Lod Score ◽  
Quantitative Genetic ◽  
Testicular Weight

Abstract Comparisons across 13 inbred strains of laboratory mice for reproductive organ (paired seminal vesicles and paired testes) weights indicated a very marked contrast between the C57BL/6By and NZB/BINJ mice. Subsequently these strains were selected to perform a quantitative genetic analysis and full genome scan for seminal vesicle and testis weights. An F2 population was generated. The quantitative genetic analyses indicated that each was linked to several genes. Sixty-six short sequences for length polymorphism were used as markers in the wide genome scan strategy. For weight of paired testes, heritability was 82.3% of the total variance and five QTL contributed to 72.8% of the total variance. Three reached a highly significant threshold (>4.5) and were mapped on chromosome X (LOD score 9.11), chromosome 4 (LOD score 5.96), chromosome 10 (LOD score 5.81); two QTL were suggested: chromosome 13 (LOD score 3.10) and chromosome 18 (LOD score 2.80). Heritability for weight of seminal vesicles was 50.7%. One QTL was mapped on chromosome 4 (LOD score 9.21) and contributed to 24.2% of the total variance. The distance of this QTL to the centromere encompassed the distance of the QTL linked with testicular weight on chromosome 4, suggesting common genetic mechanisms as expected from correlations in the F2. Both testis and seminal vesicle weights were associated with a reduction in the NZB/BINJ when this strain carried the YNPAR from CBA/H whereas the YNPAR from NZB/BINJ in the CBA/H strain did not modify reproductive organ weights, indicating that the YNPAR interacts with the non-YNPAR genes. The effects generated by this chromosomal region were significant but small in size.

scholarly journals Reproductive biology of Haemulon plumieri (Teleostei: Haemulidae) in Ceará state, Northeastern Brazil

2013 ◽  
Vol 73 (2) ◽  
pp. 391-396 ◽  
Author(s):  
RA Shinozaki-Mendes ◽  
J Santander-Neto ◽  
JRF Silva ◽  
FHV Hazin
Keyword(s):  
Reproductive Biology ◽  
Fishing Effort ◽  
Northeastern Brazil ◽  
Tropical Species ◽  
Stock Management ◽  
Western Atlantic ◽  
Total Fecundity ◽  
Maturation Stages ◽  
First Maturity ◽  
Management And Conservation

The Haemulon plumieri is a typical reef-associated and tropical species found in warm and temperate waters of the Western Atlantic. Due to the large fishing effort directed to H. plumieri, the knowledge about its reproductive biology is essential for correct stock management and conservation. The aim of this study was to characterise reproductive biology with a focus on its seasonal variation of gonadal maturation stages, first maturation size and fecundity. Specimens were monthly collected and a total of 119 females and 136 males were analysed. The reproductive cycle of Haemulon plumieri is seasonal, with higher activity between March and May. Size at first maturity (L50) was estimated at 16.86 and 18.55 cm for females and males, respectively. The total fecundity ranged between 17,816 and 120,333 mature oocytes per female and relative fecundity was 235 ± 63 oocyte.g−1 whereas batch fecundity varied between 20 and 25% from total fecundity. Since the species is widely caught, we suggest a closed season from March to May and to establish a minimum catch size of 18.5 cm for both sexes, since there is no evident sexual dimorphism.

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