Biology of Gulsa (Mystus cavasius) (original) (raw)
Related papers
This analysis illustrates the life history traits of Long whisker, Mystus gulio (Hamilton, 1822) including sex ratio, length-weight (LWRs) and length-length relationships (LLRs), condition factors (K A , K F , K R), relative weight (W R) and form factor (a 3.0), empirical based size at first sexual maturity length (L m) and natural mortality (M W , year-1). Total of 407 individuals were scarcely collected from January-December 2017 using different fishing gears. The sex ratio (M/F) was calculated as 1:1.26 (p<0.05). The overall sex ratio did not differ significantly from the expected 1:1(p>0.05). The minimum-maximum total length and body weight were observed as 5.20-15.50 cm and 2.11-33.60g for male, 5.20-17.50 cm and 1.25-57.12g for female. All LWRs were very significant with all coefficients of determination (r 2)>0.967. The allometric coefficient indicated negative allometric growth in male (b<3.0), positive allometric growth in female and also in combined (b>3.0). All LLRs were significant with r 2 values >0.965. The K F indicated the best condition of this species for their well-being. The W R was not significantly diverse from 100 for males (p = 0.552) and females (p = 0.249), which indicate suitable condition for habitat. The a 3.0 were 0.0103 and 0.0108, and the L m were 9.13 and 10.46 cm in total length for male and female, respectively. Moreover, M W was 1.16 year-1 for male and 1.02 year-1 for female. The results will be operative for the sustainable conservation of M. gulio in Bangladeshi coastal waters and also nearby countries.
Journal of Applied Ichthyology, 2006
The present study describes the annual condition as well the length-weight (LWR) and length-length relationships (LLR) of the Asian striped catfish, Mystus vittatus (Bloch, 1794) (Siluriformes: Bagridae), an important fishery in the Mathabhanga River (SW Bangladesh). A total of 2438 specimens (3.60-9.60 cm standard length) used in this study was caught with traditional fishing gear from January to December 2004. Overall, the allometric coefficient b of the LWR was close to the isometric value (b ¼ 3.058), although it suggested negative allometric growth for males (b ¼ 2.959) whilst positive allometric growth for females (b ¼ 3.134). The results further indicated that the LLRs were highly correlated (r 2 > 0.989, P < 0.001). The monthly gonadosomatic index showed that the reproductive period of M. vittatus began in April, and ended in August when the highest values of the Fulton's condition factor (K) indicated their recovery. These results will be useful for fishery managers to impose adequate regulations for sustainable fishery management not only in the Mathabhanga River of Bangladesh but also in neighbouring countries. Fig. 4. Monthly changes in the mean value and range of gonadosomatic index (vertical bars) for both sexes of Mystus vittatus in the Mathabhanga River, southwestern Bangladesh Condition, LWR and LLR of M. vittatus 307
Aquaculture, 2019
Mystus gulio, the long whiskers catfish is a euryhaline fish, which thrives well in brackishwater and freshwater environments. This species is widely distributed from Sindh, India and Myanmar to Malay Archipelago and Sri Lanka. It is a popular food fish due to its taste, nutritional value and contribution to the nutritional security as an important small indigenous fish species in Sundarban area of India and Bangladesh. Recently, catch of this species has declined in the Sundarban due to over fishing and various inadvertent ecological changes. A number of scientific studies have investigated different aspects of its biology, breeding and aquaculture, but to date no comprehensive documentation is available. Therefore, the present review provides an insight into the status of food and feeding habit, reproductive biology, breeding, farming, nutritional requirement, disease and marketing of M. gulio, which will help in future development on seed production, farming, and conservation of this species. This review also highlights the research gaps such as nutritional requirements, round the year large-scale seed production and farming systems that will help to develop future aquaculture of M. gulio in South Asia. 2002), Kala-tenguah in other parts of India (Daniels, 2002), longwhiskered catfish in Sri Lanka (Pethiyagoda, 1991) and Nga-zin in Myanmar (Khin, 1948). Talwar and Jhingran (1991) have reported that this fish mainly inhabits brackishwater, and sometimes enters and lives in freshwater environment. Mukherjee et al. (2002) have reported its availability in sea and estuarine waters. Shafi and Quddus (2001) have documented its availability in canals, beels, haors, oxbow lakes, rivers and estuaries of Bangladesh, and in Sundarban delta (Ganges-Brahmaputra estuary) of India and Bangladesh (Huda et al., 2003). Although, M. gulio was described from the upper stretches of the Gangetic estuary by Hamilton (1822), it is distributed widely in seas, estuaries and tidal waters from Sindh, India and Myanmar to Malay Archipelago and Sri Lanka, and also from Sumatra and Siam (Day, 1878). Distribution is also reported along the estuarine and tidal water shores of Bangladesh,
2013
Studies on reproductive biology are essential to assess culture potential of a fish species. Mystus tengara is a popular food fish as well as preferred as an ornamental fish in West Bengal. Till date detailed report on reproductive biology of this fish species in the agro-climatic context of West Bengal is lacking. Therefore, the present work was aimed to study the detailed reproductive biology of Mystus tengara with an emphasis on sex ratio, length at first sexual maturity, cycle of gonadal maturation and spawning periodicity using standard methods. Results of the study revealed female dominance of the species over male in the population. However, the males showed earlier maturation than females. Five gonadal maturity stages namely immature, maturing, mature, ripe and spent were identified both for female and male fishes. Monthly study of gonadosomatic index (GSI), condition factor and mean ova diameter revealed that the breeding season for this fish species extended from May to September with a single spawning month in July. Total spawning behaviour along with synchronous oocytes development was also observed in this fish species.
Iranian Journal of Ichthyology, 2019
The present study describes the sex ratio (SR), distribution of length-frequency (DLF), relationship of length-weight (RLW), relationship of length-length (RLL) and condition factors of Mystus tengara , a small indigenous freshwater fish species. A total of 881 specimens ranging from 4.3-11.4 cm L T (total length) and 3.8-9.6 g WB (body weight) were investigated in the Ganges River of Rajshahi, northwestern Bangladesh from January 2010 to December 2010. The overall sex ratio showed significant differences from the expected value of 1:1 (df=1, χ2=8.9, P 0.91, distribution of length-frequency). The value of Fulton’s condition factor (KF) was ranged from 0.9 to 1.2 for male and 1.0 to 1.5 for female M. tengara . Also, relative weight (WR) was significantly higher in females (WR>100) than in males (WR<100) indicating imbalance habitat with food availability.
Aquaculture Studies, 2022
An investigation was conducted to observe some biological aspects including growth, sex ratio, gonadal maturity, artificial insemination, fecundity, fertilization, hatching and larval development of Mystus cavasius in a private hatchery. With the specific growth rate (SGR) of 1.80±0.53 and average daily gain (ADG) of 0.18±1.0, the total weight of the sampled fish ranged from 1.59±0.44 to 28.30±14.77 g, and the length ranged from 3.39±0.77 to 13.62±3.16 cm. There has been a strong association between fish length and weight (r2=0.95). The ratio of males to females was 1:1.58. The female and male lengths at first maturity were 9.2 and 9.6 cm, respectively. The gonadosomatic index (GSI) of females found in the present study were ranged from 4.35 to 7.44 with the mean of 6.71±0.69 during the study period. The fish is highly fecund and fecundity ranged from 5600 to 25860 with the mean of 17083±6055 for the corresponding length 15.49±1.69 cm, body weight 37.53±7.24 g and gonad weight 2.55±...
Mystus tengara is a freshwater catfish of Indian subcontinent having good market demand as food fish due to its good taste and high nutrient profile. Recently it has made its entry in ornamental fish markets and also has been reported to be exported as indigenous ornamental fish from India with moderate export price. Earlier not much work has been performed on feeding and breeding biology of this fish species and the information so far available on these two aspects is also in a scattered manner. So in the present report it has been tried to sum up all the available information on these aspects along with noting down the lacunae of information further study of which will be beneficial for its future fishery and management.
Mystus indicus and M. heoki, two new catfishes from Kerala, India
Mystus indicus, a new species of the family Bagridae, is described from Kuttoor of Manimala River in Kerala, India. It is distinguished from its congeners by the following combination of characters: snout longer; median groove on head appear as double cephalic fontanels; occipital process reaches to basal bone of dorsal fin, on both sides of occipital process a thick layer of flesh present, which conceals the former from side view; rayed dorsal base prominently swollen on both sides. Mystus heoki, new species, differs from its relative species in having a markedly elongate body, shorter head and smaller eyes; occipital process short and it never reach basal bone of dorsal fin and the former is not visible as it is concealed under a thick layer of flesh; adipose dorsal fin small, its base short, and it is located fairly away from rayed dorsal fin. The new species of fishes are described and compared with related species
A review on Mystus cavasius, a popular food fish of Indian subcontinent
2014
Mystus cavasius is a freshwater catfish which is a very popular food fish of Indian subcontinent and has high market price. Recently it has also made its mark as ornamental fish and has been exported with good market price from India. Fishery of this particular fish species till date is capture based; but to explore its fishery captive culture is needed and in this purpose detail information on its biology and fishery is required. Earlier few works have been conducted on morphology, biology and fishery & culture of this fish species; but consolidated information is not available on these aspects. So with this view the current review work has been conducted to sum up all available information along with notes down the lacunae of information which will be beneficial for the exploration of its fishery.