Seasonal morphological changes in the Gonads of Clupisoma garua (original) (raw)
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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.
A General Overview on Some Aspects of Fish Reproduction
Reproduction is one of the important physiological systems that are crucial in the life cycle of living organisms including fish. The main objective of the reproduction is to maintain the existence of the species and therefore fish have a strategies and tactics to achieve this objective. The reproduction behaviours are important to be studied in relation to know the population dynamic of fishes and their spawning seasons. This information is very crucial in relation to the development of breeding technology for aquaculture and conservation (restocking) purposes. This paper reviews the reproductive strategy, fecundity and spawning frequency of fishes.
A Review on the Reproduction and Development in Fish
BJSTR, 2017
In order that survival of young be more than optimum, the timing of spawning by the mature adult fish is so adjusted that must be closely linked to the availability of maximum congenial environment added by increased food availability of food for the newly hatched young ones. The availability of food for the larvae and juveniles of most temperate and cold water fish species varies on a seasonal basis and following this fish are usually found to have a discrete and selective spawning season so perfectly timed that hatched out larvae will get readily available exogenous food from nature for their further development. Thus, in many temperate and cold water species, spawning is an annual event. Spawning culminates a series of preparatory events during which the gametes develop and the gonads increase in size.
An Improved and Simplified Terminology for Reproductive Classification in Fishes
As the number of fish reproductive studies has proliferated, so has the number of gonadal classification schemes and terms. This has made it difficult for managers and scientists to communicate and for comparisons to be made between studies. We propose the adoption of a simple, universal terminology for the phases in the reproductive cycle that can be used with all male and female elasmobranch and teleost fishes. These phases were chosen because they define key milestones in the reproductive cycle representing critical parameters such as size at maturity, duration of spawning season, location and diel periodicity of spawning, and fecundity. The phases we propose include: Immature, Developing, Spawning Capable, Actively Spawning, Regressing and Regenerating. Although the histological criteria identifying each phase may vary for different species and phases may not always occur sequentially, each phase is conceptually universal. The Immature phase can only occur once. The Developing phase signals entry into the gonadotropin-dependent stage of oogenesis and spermatogenesis and gonadal growth. The Spawning Capable phase indicates fish that will spawn this season because development within ovaries (fully grown vitellogenic oocytes) or testes (spermatozoa in lumens/ducts) is sufficiently advanced. Actively Spawning females are those that show recent evidence of spawning (i.e., hydrated or ovulated oocytes). Females of many species cycle between the Spawning Capable and Actively Spawning phases during the reproductive season and these phases are necessary to determine fecundity, spawning frequency, location and diel periodicity. Spawning Capable and Actively Spawning phases are difficult to differentiate histologically in males. The Regressing phase indicates fish that are completing the spawning season. Fish in the Regenerating phase are sexually mature but reproductively inactive. We show how researchers can incorporate species-specific histological criteria or classes within each of the universal phases, allowing more specific divisions yet preserving the overall reproductive terminology for comparative purposes.
THE FECUNDIry AND SEX-RATIO OF CHANNA PUNCTATUS (BLOCH), A SMALL INDIGENOUS FISH
THE FECUNDIry AND SEX-RATIO OF CHANNA PUNCTATUS (BLOCH), A SMALL INDIGENOUS FISH INTRODUCTION Reproduction is the process by whch specres are perpetuated and by which, rn comb nation \,",;th Ee:er:: change, characteristtcs for new species t,rrt "r.p... (Lagler et ol., 1.977). tt is a physiological phenomenon and most aquatic organisms spend much of their lives and energies for it. After a brief juvenile stage, they develop sperms or eggs, spawn, recover, and repeat the process in a cycle that continues until death (Royce, 1972). Continuity of this biological race is maintained by the process of reproduction and failing which they may lead to extinction. So, knowledge about reproduction and reproductive activities are vital and takes a place of paramount importance in studying the biological condition of any organism in its environment. A precise knowledge on fecundity of a fish is also important to evaluate its life history, commercial catch, artificial propagation, culture practice and proper management of the fishery (Shafi et ol., t97g; Bhuiyan and Rahman,19g2; Afroze and Hossain, f9g3; Rahman et al., 20021. The term fecundity can be expressed as the to_tal number of eggs present in the ovary (Bhuiyan and Afroze, 1996). The reproductive .rp.iity of fish population is a functron of the fecundity of females (Shafi and Mustafa, 1976). Variation in fecundity is very common among the same species of fish depending on their size, age and environmental conditions (Lagler et ol., t977). Fecundity is also related to length, sJmatjc and gonadat weight. In many fishes the relationship between the fecundity and length, somatic .nJgonra$f weight is curvilinear than linear (Bagen al, L97g). Fecundity is one of the important aspects of the biology and population dynamics of a fish. Accurate estimation of fecundity is must for studying tf,. poprirtion dynamics (Hossain, 1989). Many workers have studied the fecundity of different species of fishes, vD., Afroze and Hossain (J.9g3), Bhuiyan and Rahman (1984), Banu et o/. (1985), Nargis and Hossain (1988), lslam and Azadi (fS89), tsiam and Hossain (1990), Hoque and Hossain (igSS),'nla; er ol.
2020
The term 'fecundity' denotes the total number of eggs present in the ovaries of a fish, which are likely to be laid during the next spawning season (Bagenal, 1957). The knowledge of fecundity finds a vast application in stock size assessment, stock discrimination (Holden and Raitt, 1974), and rational utilization of stock (Morales, 1991). The assessment of fecundity is useful in evaluating the variations in the fish population, commercial potentialities of its stock, life history, and in the proper management of fishery (Marimuthu et al., 2009). Fecundity and its relation with different body parameters of female fish make it possible to estimate the potential of egg output (Chondar, 1977), and its relation with other morphological characters like size, age and weight have often been used to provide a reliable index of density-dependent factors affecting the size of a population (Ulfat et al., 2014). Biologists have been investigating fish gonads intending to identify annual ...
Mystus vittatus, an indigenous fish species of West-Bengal are economically important due to its delicious taste. The ovarian histo-morphology and its annual changes and the spawning periodicity of this catfish were studied collected monthly in one year period of November, 2012 to October, 2013. The fecundity, gonado-somatic index, different stages of ovarian development (nucleus changes, oocyte diameter and formation of yolk vesicles, yolk granules and lipid droplets through histological observation) of M. vittatus were also observed in this article. By gross morphology and its seasonal changes of ovary especially on the changes in cell structure of this species, five maturity stages were distinguished to categorize the developing ovary: immature, mature, early ripening, ripe and spent. Our investigation has revealed that gonado-somatic index (GSI) in M. vittatus began to increase in March and peaked in July then declined sharply in September-October. This cat fish attained sexual maturity at 10-11 cm in length, 10-12 g in weight which was confirmed at the peaks of gonado-somatic index (GSI) and fecundity. The fecundity of Mystus vittatus has shown highly significant correlation with body length, body weight and ovary weight.
Chittagong University Journal of Biological Sciences, 2013
Gonialosa manmina was found to spawn once in a year from February to July in the Kaptai Lake. The fish was found to attain sexual maturity at 80 mm total length. Sex ratio of male and female was 1:2.39 (?2 = 26.25, df = 1, P<0.01). Female dominated significantly over male throughout the year. Seven stages of maturity were determined on the basis of morphological characteristics of gonads and diameter of ova. Fecundity of 24 fishes ranged from 13460 eggs to 56980 eggs with a mean of 32003±12612 eggs. Fecundity factor was 1882 eggs g-1 body weight. Fecundity (F) was highly correlated (P<0.001) with total length (TL), body weight (BW), ovary length (OL) and ovary weight (OW) and the relationships were as follows:F = 1.0080 TL 2.1648 or Log F = 0.0035 + 2.1648 Log TL (r = 0.977, t = 21.49) F = 2.8807 SL 2.0420 or Log F = 0.4595 + 2.0420 Log SL (r = 0.958, t = 15.66) F = 5477.722 BW 0.6332 or Log F = 3.7386 + 0.6332 Log BW (r = 0.990, t = 32.91) F = 12.516 OL 2.2057 or Log F = 1.09...
Acta Ichthyologica et Piscatoria, 2004
Background. Usage of biosciences in increasing fish production needs to have a proper understanding and knowledge of endocrine physiology of fish reproduction. The most suitable method of determining the reproductive cycle in fishes is to observe seasonal development changes in the gonads. The present paper describes morphological changes in gonads of Mystus montanus. Materials and Methods. The individuals of M. montanus were sampled monthly in captive condition throughout one year to determine the changes occurring in gonadal histology and reproductive status. The stages of gonadal maturation and the seasonal changes in the proportion of oocyte development within the ovaries were noticed and maturity stages were assessed by microscopic and also macroscopic observations. Results. The peak spawning period of Mystus montanus was noticed during November-January in male and October-December in female. The size at first maturity was 10-11 cm (8-12 g) in male and 13-14 cm (14-16 g) in female, respectively. M. montanus spawned only once in a year with the onset of northeast monsoon. The gonadosomatic index (GSI) ranged from 2.8 to 8.5 in males and from 4 to 16 in females and their condition factor (CF) was 4-6 and 6-9, respectively. Conclusion. The sequence of gonadal maturation in M. montanus is morphologically and histologically divided into five stages viz. immature, maturing, mature, matured, and spent or rest.