Determination of Seasonal Cyclicity of Gonad by Studying Its Histology during Pre-Spawning and Spawning Period of Anabas testudineus (Bloch) In Natural Environment (original) (raw)
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Study on the Reproductive Biology and Gonadal Cycle of Anabas testudineusDuring Breeding Season
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The gonadal cycle constitutes a significant biological parameter to be investigated in the fields of Anabas testudineusreproductive biology and ecology and fisheries science. Maturity data may also be used to carry out temporary analysis of fish stocks' life-history characteristics. Maturity data was often used to characterise the species' gondola cycle and to track long-term transition in the reproductive cycle. That's why, according to the reproductive plan of the genus, the maturity stage should be calculated. In the current research, the gonadal cycle is observed by Anabas testudineus to maturity. The ripeness scales should ideally be based on quantitative and universal gonadal properties, which are measured macroscopically since they are less costly and labour intensive than microscope maturity stadiums.. The rate of ripeness should be standardised.
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The present investigation was carried out to analyze the histomorphological features of gonads of Neolissochilus hexagonolepis. The study revealed that the gonads of N. hexagonolepis pass through six stages of maturation within a year viz. immature, maturing virgin and recovering spent, ripening, mature, spawning and spent. The testes were found to be of lobular type and the ovaries of the fish were observed to be of cyst ovarian type. The histological study revealed that the testes of N. hexagonolepis undergo considerable changes in shape, size, colour, volume, length and occurrence of various types of spermatogenic cells within their lobules during different phases of reproductive cycle of the fish. Similarly, the histological sections of the ovaries revealed several stages of developing oocytes in the ovigerous lamellae and the developing oocytes were found to be passing through chromatin nucleolus stage, early and late peri-nucleolus stage, yolk vesicle stage, yolk stage and mig...
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The study was conducted in the laboratory to understand the morphometrical measurement and relationship among fecundity to length and weight of fish, length and weight of ovary and volume of ovary as well as relationship among ovary weight of fish to total length and total weight of fish for reproductive biology of Anabas testudineus. Adult of A. testudineus ranging from the length of 110 to 170 mm and weight of 30 to 60 gm were collected from local market and acclimatized in the laboratory conditions with artificial feed. The length of the testis in different body size varied from 12.0 to 22.7 mm. The weight of testis showed decreasing trend from 0.252 gm in September and 0.236 gm in October. The Gonadosomatic index (GnSI) of testis varied from 0.494 to 0.668. The length of the ovary in different body size varied from 11.0 to 16.2 mm. The Gonado somatic index of ovary varied from to 0.271 to 0.880. The correlation and coefficient of fecundity with different variables like total len...
Seasonal Variation in the Microscopic Anatomy of Gonads and Gonadosomatic Index of CLUPISOMA GARUA
Pakistan Journal of Agricultural Research , 2019
Seasonal variation in the gonads of Clupisoma garua was studied from the river Indus and its tributaries in Khyber Pakhtunkhwa and Northern Punjab, Pakistan. A total of 48 fishes of both sexes (n= 12 per season; 9 female and 3 male) were collected in different seasons of 2016-17. Preparatory phase of reproductive cycle was observed in spring with having thick tunica albuginea and rapid spermatogenesis in testes while appearance of cortical alveoli or yolk vesicle in cortex of cytoplasm in ovaries. Gonads attain maximum size and weight in spawning phase during summer. Free oozing of spermatozoa in testes and ovaries packed with fully grown eggs are the distinct features of this phase. The highest values of Gonadosomatic Index (GSI) for male and female in summer coincided with the histological structure of the gonads where they are in their spawning phase. Present study revealed that C. garua breed once in a year during summer season and this information will be helpful in culturing of this economically important catfish in Pakistan.
The reproductive cycles of male and female Anadara granosa and Anadara antiquata which have been studied and compared by histological techniques sho wed great anatomical similarity. Gametogenesis is associated with a system of follicle cells which br eak down as the gametes approach maturity. The arrangement of follicle cells is characteristics of the sex. In the female, gametogonia are peripheral to the follicle cells, whilst in the male they are interstitial. The process of spermatogenesis parallel the classical vertebrate pattern, i.e. successive layer s of spermatogenic cells (spermatogonia, primary an d secondary spermatocytes, spermatids, and spermatozo a) occurring more or less regularly in succession toward the centre of the follicle. The diameter of the maximum size oocytes is 75 μm for A. granosa and 65 μm for A. antiquata. Spawning in both A. granosa and A. antiquata is progressing gradually throughout the year as indicated by the availabilit y of various stages of oogoni...
Seasonal morphological changes in the Gonads of Clupisoma garua
Thesis , 2017
Fish are aquatic, cold blooded vertebrates respire through gills and possess all vertebrate activities like breathing, feeding, movement, reproduction, and senses. There are about 8000 fresh water fish species are present in the world including the species of lakes and rivers. With the increase in human population the demand of food is also increasing. We need to grow and reproduce the food animals naturally or artificially in confined areas or in the wild to meet the requirements to fulfill the requirements. In the last few decades increase in fish production makes the fishing industry one of the fastest growing food industries.
Journal of the Bangladesh Agricultural University, 2017
The spiny eel, Mastacembelus armatus is one of the most common and economically important inland teleost species of Asia having high market and nutritive values. The demand for the fish is almost always exceeds its supply. Histological analysis of developmental stages of both oocytes and sperrnatocytes maturation were undertaken and dimensions of ovarian oocytes were observed to evaluate the annual reproductive condition of M. armatus during August 2012 to July 2013. Monthly sampling of adult individuals of M. armatus was done from haor region of Kishoreganj district, Bangladesh. Both the gonads were paired, elongated and of unequal in length. The colour of ovaries varied from reddish brown to light yellowish; whereas, testes varied from whitish to creamy or dull white. From the histological study, five stages of oocyte development (oogonia, chromatin nucleolar stage oocyte, perinucleolar stage oocytes, yolk vesicle oocyte, and yolk granule stage) were observed upon their changes in nucleus. Female M. armatus having immature stages of oocytes (early and late perinucleolar stage oocytes) were mostly available in the months of November and December. Yolk vesicle stage oocytes appeared during the months of January and February. Early yolk granule stage oocytes appeared during the months of March and April while late yolk granule stage oocytes were observed during the months of May and June. Oocytes and nuclei diameters were observed ranged from 12-1050 µm and 10-212 µm, respectively until ovulation. In male gonads, four stages of spermatogenesis (spermatogonia, spermatocytes, spermatids, and spermatozoa) were distinguished during the study period where spermatids were prominent in January to March and spermatozoa in April to July. From this study, the peak gonadal development of M. armatus is found in June and thus, it is clearly indicated that the fish breed during May to June.
Morphological Study and Role of Gonad Cells in Freshwater Fish-Reproduction
Reproduction is a vital process provided to all living individuals by the nature itself to reproduce their similar one after death. Channa gachua is used due to easily throughout year availability. Male gonad was removed during different reproductive phases. The nourishing protein contain was recorded by Lowry's method 660nm during matured male gonad as 0.555 mg/ml. Sertoli cells were observed on their development and parameters were recorded with the help of phase contrast microscope (Phase contrast-Olympus) as total number of Sertoli cells 150±199 in number, diameter of the cell 0.1±0.2µ perimeter of the Sertoli Cell 0.1 to 0.01µ in matured testis on the colour intensity. Same conditions were used to abnormal male brooder in hatchery the nourishing protein contain was comparatively low about infertile male brooder in matured gonad as 0.467mg/ml. The development of Sertoli cell and its parameter were comparatively low as number of Sertoli cells 99±120, diameter of the cell 0.001±0.005µ perimeter of the Sertoli Cell in male brooder. The lesser development of sertoli cell leads to improper development of Sertoli gives insufficient sperms cell count for abnormal fertilization.
The study was conducted to know the cyclic changes in gonadal maturation and to investigate the developmental stages of oocytes and testicular germ cells of an air-breathing fish, Channa striata. Fish were sampled monthly from lentic and lotic environments of three geographical locations of Bangladesh from December to November and the histological analysis of their gonad was done to evaluate the objectives. The highest mean GSI was 5.95 ± 0.20 for female in July and 0.14 ± 0.01 for male also in July showing that the gonadal development reached its peak during this month. The highest mean oocyte diameter was 1257.50 ± 24.17 μm observed in July implying that the oocyte reached maturity in this month. Histological study of ovary revealed the evidence of early yolk granule stage and late yolk granule stage from April to July. In case of male four stages of spermatogenesis were distinguished and spermatozoa were highly abundant in June and July. So the monthly pooled values of GSI and the analysis of gonadal histology indicated that the peak breeding season of C. striata occurred in July in the lentic and lotic environments. Samples collected from lentic and lotic habitats are suggestive of no difference in the development of the gonad. The results of the present study will be useful for selective breeding programme, conservation and sustainable fishery management of C. striata in its natural habitat.