Histological analysis of ovarian development and sex ratio of a catfish Ompok pabda

Siddiqua K. A., . and Ahmed A. T. A., . and Hussain M. G., . Histological analysis of ovarian development and sex ratio of a catfish Ompok pabda. pp. 164-176. ISSN 0116-6514

A histological analysis of ovarian development as well as the spawning pattern and the sex ratio were determined in an endangered freshwater catfish Ompok pabda (Hamilton-Buchanan 1822). A total of 77 fish samples were randomly collected from the same rearing pond for 9 months at the Freshwater Station Bangladesh Fisheries Research Institute (BFRI) Mymensingh Bangladesh. The sex ratio of the 77 sampled fish was 0:37 (male:female) and this difference was not significant (p0.05). From histological analysis five developmental stages of oocytes were distinguished namely (1) oogonia (2) pre-vitellogenic oocytes including early perinucleolus and late perinucleolus (3) vitellogenic oocytes including initial vitellogenic oocytes (cortical alveoli) and active vitellogenic oocytes (yolk granules) (4) mature oocytes and (5) atretic oocytes. The percent distribution of matured oocytes (about 76) as well as gonado-somatic index (13.730.95) were observed to be highest in July whereas the highest values of both body weight (28.552.9g) and ovary weight (3.850.8g) were recorded in June. Oocytes became larger from April to June (211 m“295.20 m) but shrank slightly in July (287 m). It is evident that O. pabda spawns once a year extending from May to July with the peak spawning period occurring in June and July.

Full text available from: Official URL: https://www.asianfisheriessociety.org/publication/...

Abstract

A histological analysis of ovarian development as well as the spawning pattern and the sex ratio were determined in an endangered freshwater catfish Ompok pabda (Hamilton-Buchanan 1822). A total of 77 fish samples were randomly collected from the same rearing pond for 9 months at the Freshwater Station Bangladesh Fisheries Research Institute (BFRI) Mymensingh Bangladesh. The sex ratio of the 77 sampled fish was 0:37 (male:female) and this difference was not significant (p0.05). From histological analysis five developmental stages of oocytes were distinguished namely (1) oogonia (2) pre-vitellogenic oocytes including early perinucleolus and late perinucleolus (3) vitellogenic oocytes including initial vitellogenic oocytes (cortical alveoli) and active vitellogenic oocytes (yolk granules) (4) mature oocytes and (5) atretic oocytes. The percent distribution of matured oocytes (about 76) as well as gonado-somatic index (13.730.95) were observed to be highest in July whereas the highest values of both body weight (28.552.9g) and ovary weight (3.850.8g) were recorded in June. Oocytes became larger from April to June (211 m“295.20 m) but shrank slightly in July (287 m). It is evident that O. pabda spawns once a year extending from May to July with the peak spawning period occurring in June and July.

[error in script]

Item Type:	Article
AGROVOC Term:	Ompok pabda
AGROVOC Term:	Freshwater catfish
AGROVOC Term:	Animal histology
AGROVOC Term:	Sex ratio
AGROVOC Term:	Spawning
AGROVOC Term:	Ponds
AGROVOC Term:	Developmental stages
AGROVOC Term:	Oocytes
AGROVOC Term:	Body weight
AGROVOC Term:	Maturation
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23730

Actions (login required)

View Item