Books by Sandipan Gupta
Book Chapter by Sandipan Gupta
Diversification of Aquaculture, 2012
Papers by Sandipan Gupta
Ecological Indicators, 2019
Information on various aspects of reproductive traits of female pool barbs from various stretches... more Information on various aspects of reproductive traits of female pool barbs from various stretches of Ganga River basin, India was generated in relation to climatic variability. The presumptions surrounding – minnows being the first and easily hit by climatic variability, was validated. GAM models revealed low threshold rainfall requirement (>50 mm) within a wide temperature range (20–30 °C) necessary for attainment of breeding GSI (>10.5 units). Pre-spawning fitness (Kspawn50) and size at 50% maturity (LM50) benchmarked through Kaplan-Meier survival estimates were in the range 1.61–1.67 units (Fulton condition factor) and 8.6–9.0 cm respectively. Mapping of climate preferendum through LOESS smoothing hinted both low-mild rainfall (50–150 mm) and high rainfall conditions (400–700 mm) conducive for attaining pre-spawning fitness while no dependence on temperature was observed. First maturity of females was encountered at 4.7 cm within the size range 4.4–12.6 cm. The present study hinted a probable reduction (1.4–1.8 cm) in size at maturity of female pool barbs. We observed pool barbs can breed within a wide thermal regime following slightest of rainfall events. Collating this with the present rates of climatic variability, we infer negligible threat of changing climate on reproduction of Puntius sophore in near future – contrary to the existing presumptions. Owing to the easiness in attainment of pre-spawning fitness under an apparently flexible climate preferendum, ‘skipped spawning’ decisions while facing climatic variability also seem minimum. The recorded breeding thresholds may serve as future references while assessing climate driven changes on reproduction and evolutionary adaptations in Gangetic minnows.
Environmental Biology of Fishes, Jan 18, 2018
Temperature and seasonal rainfall along with other environmental variables are important in regul... more Temperature and seasonal rainfall along with other environmental variables are important in regulating the reproductive cycles in teleost fishes. Certain environmental variables may act as cues for reproduction and changes in these may affect seasonality and success of reproduction, as fishes are known to integrate their physiological functions with environmental cycles. Wetlands are sensitive to climate change due to their shallow and confined nature. Since wetlands are important spawning and nursery grounds for many fishes, changes in the environmental variables may have direct consequences for the spawning and survival of fish. In the present study, we have assessed climatic and water chemistry variables capable of influencing seasonality in environmental variables as well as gonadal maturation of spotted snakehead Channa punctata, to predict threshold values of Gonado Somatic Index in females and a favourable range of identified climatic and water chemistry variables for breeding success. Among the climatic and water chemistry variables studied, seasonal variation in rainfall was found to have the most profound effect on gonadal maturation and breeding in C. punctata, followed by water temperature. The favourable range of rainfall obtained varied between 800 mm to 1400 mm, corresponding to the water temperature range between 29 °C and 31 °C. An overall significant warming trend with a reduction in total rainfall has been observed with changes in seasonal trends in temperature and rainfall in the study area. The rainfall being the major climatic factors influencing water chemistry in the wetlands during the spawning season, changes in rainfall pattern may influence breeding periodicity of C. punctata in wetlands in climate change scenario.
The concept of threshold condition factor (Fulton), beyond which more than 50% of the female fish... more The concept of threshold condition factor (Fulton), beyond which more than 50% of the female fish population may attain readiness for spawning coined as pre-spawning fitness (Kspawn50), has been proposed in the present article and has been estimated by applying the non-parametric Kaplan-Meier method for fitting survival function. A binary coding strategy of gonadal maturity stages was used to classify whether a female fish is “ready to spawn” or not. The proposed Kspawn50 has been generated for female Mystus tengara (1.13–1.21 units), M. cavasius (0.846–0.945 units), and Eutropiichthys vacha (0.716–0.799 units). Information on the range of egg parameters (fecundity, egg weight, egg diameter) expected at the pre-spawning stage was also generated. Additional information on species-specific thermal and precipitation window (climate preferendum) within which Kspawn50 is attained was also generated through the LOESS smoothing technique. Water temperatures between 31 and 36 °C (M. tengara), 30 and 32 °C (M. cavasius), and 29.5 and 31 °C (E. vacha) and monthly rainfall between 200 and 325 mm (M. tengara), > 250 mm (M. cavasius), and around 50 mm and between 350 and 850 mm (E. vacha) were found to be optimum for attainment of Kspawn50. The importance of parameterization and benchmarking of Kspawn50 in addition to other conventional reproductive biology parameters has been discussed in the present article. The purposes of the present study were fulfilled by generating baseline information and similar information may be generated for other species replicating the innovative methodology used in this study.
Sperata aor is a freshwater catfish of Bagridae family which is distributed throughout Indian sub... more Sperata aor is a freshwater catfish of Bagridae family which is distributed throughout Indian subcontinent including India, Bangladesh, Pakistan, Nepal and Myanmar. It is a popular food fish due to its good taste and high nutritional value. Recently it has also made its entry in domestic ornamental fish markets of India and has been reported to have moderate export price too. Earlier, few works on different aspects of its morphology and biology have been carried out but no consolidated review is available on these aspects. Therefore, the current work was done to sum up all available information on these aspects to fill the information gap that will be beneficial to its future fishery. Considering all available information, knowledge on food and feeding habit of this fish species is satisfactory, except detail information on spatial variation of its breeding periodicity, proper information on other aspects are still lacking. No work has been conducted to examine its captive culture potential or for induced breeding. Further work should be done to explore its future fishery.
99 taxa of avifauna belonging to 43 families has been recorded in successive years (2013 and 2014... more 99 taxa of avifauna belonging to 43 families has been recorded in successive years (2013 and 2014) in a seasonal survey
carried out at Jaldapara National Park located within Himalayan Terai region of North Bengal. The open forest habitat found out to be the richest in avifauna among the other habitat types. Among the feeding guilds, insectivores dominate in species strength and in the number habitat types represented. Survey shows that the landscape of Jaldapara is frequently visited by 2 Vulnerable (Lesser Adjutant and Pallas's Fish Eagle) and 1 Near Threatened species (River Lapwing). The study documented Kalij Pheasnat which is probably new record from this region.
Wallago attu is a fast growing catfish species which has good demand as a food fish as having hig... more Wallago attu is a fast growing catfish species which has good demand as a food fish as having high nutritional value. It is also popular as a sport fish and recently has also made its entry in ornamental fish markets. It is widely distributed; used to occur in India, Bangladesh, Pakistan, Sri Lanka, Nepal, Afghanistan, Indonesia, Myanmar, Thailand, Vietnam and Cambodia. Earlier it has been reported as Lower Risk near Threatened species in India, but the assessment was made more than a decade ago. So it's natural that in between over harvesting and other anthropogenic factors have worsened the population status of this fish species; and thus proper measures are required to conserve this fish species. This report has been prepared for summing up the available information on different aspects of Wallago attu as well as to note down the feasible actions that to be considered for its conservation.
Ompok bimaculatus is a freshwater catfish, used to occur naturally in streams, rivers, lakes, pon... more Ompok bimaculatus is a freshwater catfish, used to occur naturally in streams, rivers, lakes, ponds, canals and inundated fields. It is a popular food fish in South and South-East Asian countries especially due to its good taste and high nutritional value with good amount of protein, lipid and mineral content. Recently it has also been reported to have moderate demand among the ornamental fish hobbyists. Earlier few works have been documented on food and feeding habit, reproductive biology and induced breeding of this fish species; but so far no such consolidated review report is available on these aspects. So with this view, the current report has been prepared to sum up all those previously documented information along with pointing out the lacunae of information further study of which will be beneficial for fishery and conservation perspective for this fish species in near future.
Mystus tengara is a freshwater catfish of Indian subcontinent having good market demand as food f... more 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.
Systomus sarana is a freshwater fish species which is widely distributed in different countries o... more Systomus sarana is a freshwater fish species which is widely distributed in different countries of Indian subcontinent and is the most popular and favourite food fish among the barb species due to good nutritional value. It is also popular as an aquarium species. Recently due to number of reasons, population of this particular fish species is facing the threat of extinction. In India it has been reported as endangered while in Bangladesh it has been reported as critically endangered. So considering the declining trend of its population, proper management measures are needed to conserve this fish species. Among the different conservation management strategies, captive breeding is one of the best approaches, but success of captive breeding completely depends on proper information on feeding and breeding biology of that particular fish species. Earlier ample works have been carried out on feeding and breeding biology of Systomus sarana, but a consolidated report on these aspects is really lacking. So this report has been prepared to sum up all available information on these two aspects of this fish species along with noting down the missing information further study of which is needed to support the conservation of Systomus sarana.
Puntius conchonius, a freshwater cyprinid of Indian subcontinent is a popular food fish mainly of... more Puntius conchonius, a freshwater cyprinid of Indian subcontinent is a popular food fish mainly of eastern part of India and Bangladesh. It has also its importance as an ornamental fish and having good demand in both domestic as well as international ornamental fish markets of India. Though a potent commercially important fish; so far not much work has been done on food, feeding habit and reproductive biology of this fish species. Not only that, the presently available information is also in a scattered format; no such consolidated report is available on these aspects. So with this view, the present report has been prepared to sum up all these available information along with pointing out the lacunae of information study of which will help to make its fishery and trade more vibrant and sustainable.
Puntius sophore is a freshwater cyprinid of Indian sub-continent which has high demand as a food ... more Puntius sophore is a freshwater cyprinid of Indian sub-continent which has high demand as a food fish due to its high nutritional value along with presence of good amount of protein, micronutrients and vitamin. Recently it has made its entry in ornamental fish trade and has been reported to been exported as indigenous ornamental fish from India. Due to heavy fishing pressure and other anthropogenic stresses this fish species is now facing threat in natural condition. Earlier few works have been conducted on feeding and breeding biology of this fish species; but so far no such consolidated report is available on these aspects. So with this view, the present report has been prepared to sum up all the earlier documented information along with pointing out the lacunae of information which should be studied to support its future fishery.
Publication details, including instructions for authors and subscription information: http://www.... more Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/tzec20
Sperata seenghala is one of the largest freshwater catfish of Indian sub-continent. This fish has... more Sperata seenghala is one of the largest freshwater catfish of Indian sub-continent. This fish has good market demand as food fish due to its good taste with high nutritional value and for this reason it constitutes an important capture fishery of all the major rivers and reservoirs of India, Bangladesh and Pakistan. Earlier number of works has been carried out on its food and feeding habit, reproductive biology, morphology, fishery, captive culture etc, but no such consolidated review report is available. With this view the current review work has been carried out to sum up all available information along with gathering up the lacunae of information which will be helpful for future fishery and management of this fish species. It has been documented that comprehensive information is available on its food and feeding habit but further investigations are needed to put firm conclusion on some aspects of its reproductive biology and to gather proper knowledge on its captive culture technique.
Feeding is the dominant activity in entire life cycle of fish; thus detailed knowledge on food an... more Feeding is the dominant activity in entire life cycle of fish; thus detailed knowledge on food and feeding habit of any fish species is really essential to get success in culture of that particular fish species. Mystus tengara is a popular food fish due to its good taste; and recently it has also got its entry in ornamental fish mar kets. No such detail works till date has been performed on food and feeding habit of this fish species. So the present study has been performed to get information on the food and feeding habit of Mystus tengara. Gastro Somatic Index, Relative Length of Gut, Gut Fullness & Feeding Intensity and Gut Content Analysis have been performed as parts of the study. Results of the study have revealed that Mystus tengara is a carnivorous fish and zooplankton is the basic food group for this fish species; rotifera has also been observed as the most preferable food class. During the study, feeding activity of this fish species has never been observed to be dis continuous; though it has been observed to vary according to the breeding season; lowest feeding activity has been observed during intense breeding season while highest feeding activity has been observed during pre spawning months.
Mystus cavasius is a freshwater catfish which is a very popular food fish of Indian subcontinent ... more 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.
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Books by Sandipan Gupta
Book Chapter by Sandipan Gupta
Papers by Sandipan Gupta
carried out at Jaldapara National Park located within Himalayan Terai region of North Bengal. The open forest habitat found out to be the richest in avifauna among the other habitat types. Among the feeding guilds, insectivores dominate in species strength and in the number habitat types represented. Survey shows that the landscape of Jaldapara is frequently visited by 2 Vulnerable (Lesser Adjutant and Pallas's Fish Eagle) and 1 Near Threatened species (River Lapwing). The study documented Kalij Pheasnat which is probably new record from this region.
carried out at Jaldapara National Park located within Himalayan Terai region of North Bengal. The open forest habitat found out to be the richest in avifauna among the other habitat types. Among the feeding guilds, insectivores dominate in species strength and in the number habitat types represented. Survey shows that the landscape of Jaldapara is frequently visited by 2 Vulnerable (Lesser Adjutant and Pallas's Fish Eagle) and 1 Near Threatened species (River Lapwing). The study documented Kalij Pheasnat which is probably new record from this region.