Fishery and reproductive biology of the spotted sardinella, Amblygaster sirm (Walbaum, 1972) exploited along the southern coast of India

The study focused on the fishery and biological aspects of the spotted sardinella Amblygaster sirm (Walbaum, 1972) exploited along the southern coast of India from 2015 to 2020. The summary of the fishery reveals noticeable annual fluctuations in landing, with peak landings reported from November to March along the coast. The study included fish with total length (TL) ranging from 149 to 208 mm in males and 152 to 217 mm in females. The peak in gonadosomatic Index (GSI) in January indicates its spawning season, and Lm50 was estimated at 172 mm TL in females. The sex ratio (F: M) was determined at 1:1.2, with males dominating most months. Fecundity ranged from 11632 to 43200 eggs per spawning. Five stages of maturity in A. sirm were identified through external analysis of gonads. Seven histological ovarian stages of A.sirm were recorded, providing a primary reference for future studies. These findings aim to assist fishery managers and policymakers in adopting effective management practices for the sustainable harvesting of this resource

Understanding the fishery dynamics and stock health of mahi-mahi, Coryphaena hippurus (Linnaeus, 1758) from Indian coastal waters

This work delves into the mahi-mahi (dolphinfish) fishery along the Indian coast, noting its developmental stage precluding a full assessment. The analysis of population characteristics highlights their inherent resilience, driven by early maturity, substantial fecundity and rapid growth rates. These traits collectively mitigate susceptibility to fishing pressure, ensuring the maintenance of sizable spawning stock biomasses and recruitment. Through Kobe analysis, it is determined that the present fishing mortality and biomass levels remain within safe thresholds, indicating absence of overfishing. However, regular monitoring is imperative to swiftly implement management measures if necessary, safeguarding the sustainability of the mahi-mahi fishery in the long term

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Not AvailableConversion of water hyacinth into useful products is a sustainable way to address the menaces created by them, along with an exploration of beneficial applications. The present study focused on the conversion of water hyacinth into a climate-resilient product ‘biochar’ and its applications in integrated paddy and fish culture systems. The integrated culture of fish with a saline tolerant variety of paddy Pokkali is characterised by low productivity as a traditional culture method. Biochar was produced by pyrolysis technique with water hyacinth, Eichhornia crassipes as substrate. The elemental composition and structural characterization of biochar were done using CHNS analyser, FTIR, XRD, and SEM, respectively. Optimum pyrolysis conditions were finalized and pyrolysis at 300oC for 30 minutes was used for the production of sufficient quantities of biochar for further experiments. Biochar was incorporated into the feed of tilapia, Oreochromis mossambicus in the ratio of 0.5 and 1% and was fed to the fishes grown in tanks for 6 weeks. Weight and length of the fish were found to be enhanced significantly in biochar mixed feed, and the highest growth rate was recorded for the fishes fed with 1% of biochar mixed feed. Biochar amendment to the soil in the culture system at 1% concentration enhanced the specific growth rate of O. mossambicus. Varying proportions of biochar were mixed to soil @ 1, 2, 3, 4 and 5% and the effect of biochar-amended soil on the growth of pokkali was studied for the parameters, root length, shoot length and plant height. Highest growth performances were observed in 4% biochar-soil mixture in comparison to the control. The results of water hyacinth biochar experimentation on fish and paddy growth have been promising, and the work could be considered as a milestone towards further optimization and field level trials to enhance the productivity of integrated culture systems.Not Availabl

Characterisation of Biochar From Water Hyacinth Eichhornia crassipes and the Effects of Biochar on the Growth of Fish and Paddy in Integrated Culture Systems

Conversion of water hyacinth into useful products is a sustainable way to address the menaces created by them, along with an exploration of beneficial applications. The present study focused on the conversion of water hyacinth into a climate-resilient product ‘biochar’ and its applications in integrated paddy and fish culture systems. The integrated culture of fish with a saline tolerant variety of paddy Pokkali is characterised by low productivity as a traditional culture method. Biochar was produced by pyrolysis technique with water hyacinth, Eichhornia crassipes as substrate. The elemental composition and structural characterization of biochar were done using CHNS analyser, FTIR, XRD, and SEM, respectively. Optimum pyrolysis conditions were finalized and pyrolysis at 300oC for 30 minutes was used for the production of sufficient quantities of biochar for further experiments. Biochar was incorporated into the feed of tilapia, Oreochromis mossambicus in the ratio of 0.5 and 1% and was fed to the fishes grown in tanks for 6 weeks. Weight and length of the fish were found to be enhanced significantly in biochar mixed feed, and the highest growth rate was recorded for the fishes fed with 1% of biochar mixed feed. Biochar amendment to the soil in the culture system at 1% concentration enhanced the specific growth rate of O. mossambicus. Varying proportions of biochar were mixed to soil @ 1, 2, 3, 4 and 5% and the effect of biochar-amended soil on the growth of pokkali was studied for the parameters, root length, shoot length and plant height. Highest growth performances were observed in 4% biochar-soil mixture in comparison to the control. The results of water hyacinth biochar experimentation on fish and paddy growth have been promising, and the work could be considered as a milestone towards further optimization and field level trials to enhance the productivity of integrated culture systems

Not Available

Not AvailableConversion of water hyacinth into useful products is a sustainable way to address the menaces created by them, along with an exploration of beneficial applications. The present study focused on the conversion of water hyacinth into a climate-resilient product ‘biochar’ and its applications in integrated paddy and fish culture systems. The integrated culture of fish with a saline tolerant variety of paddy Pokkali is characterised by low productivity as a traditional culture method. Biochar was produced by pyrolysis technique with water hyacinth, Eichhornia crassipes as substrate. The elemental composition and structural characterization of biochar were done using CHNS analyser, FTIR, XRD, and SEM, respectively. Optimum pyrolysis conditions were finalized and pyrolysis at 300oC for 30 minutes was used for the production of sufficient quantities of biochar for further experiments. Biochar was incorporated into the feed of tilapia, Oreochromis mossambicus in the ratio of 0.5 and 1% and was fed to the fishes grown in tanks for 6 weeks. Weight and length of the fish were found to be enhanced significantly in biochar mixed feed, and the highest growth rate was recorded for the fishes fed with 1% of biochar mixed feed. Biochar amendment to the soil in the culture system at 1% concentration enhanced the specific growth rate of O. mossambicus. Varying proportions of biochar were mixed to soil @ 1, 2, 3, 4 and 5% and the effect of biochar-amended soil on the growth of pokkali was studied for the parameters, root length, shoot length and plant height. Highest growth performances were observed in 4% biochar-soil mixture in comparison to the control. The results of water hyacinth biochar experimentation on fish and paddy growth have been promising, and the work could be considered as a milestone towards further optimization and field level trials to enhance the productivity of integrated culture systems.Not Availabl