Assessment on reproductive biology of Asian swamp eel Monopterus javanensis La Cepde 1800 in relation to the impacts of paddy practice management in Kelantan Malaysia

Mohammad Noor Amal Azmai, . and Ahmad Ismail, . and Kamarul Hambali, . and Sow Ai Yin, . and Syaizwan Zahmir Zulkifli, . Assessment on reproductive biology of Asian swamp eel Monopterus javanensis La Cepde 1800 in relation to the impacts of paddy practice management in Kelantan Malaysia. pp. 65-79. ISSN 1511-3701

In order to understand the life history of the Asian swamp eel Monopterus javanensis found in paddy fields the time of maturation of its gonads was studied by using the gonadal somatic index. The peak gonadal somatic index was first found during the ploughing and seedling seasons in 2011 and 2012. This was accompanied by the yellowish egg sac observation made in the eels during the ploughing and seedling seasons which was indicative of the mid- and early maturation stages of the gonads. However the decline in GSI from the growing until the harvesting seasons indicated the poor development of gonads since differentiating the sex of the eels was hard. This could be due to the heavy application of pesticides and fertilisers during the growing season as cadmium present as impurities in the fertilisers which slowly accumulated in the gonads. The findings highlighted the availability of Asian swamp eels for local eel collectors as part of their income and the complexity of heavy metal bioaccumulation in their gonads for safe eel consumption. Overall the habitat of the Asian swamp eels may induce the differences in the maturation timing for the species.

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Abstract

In order to understand the life history of the Asian swamp eel Monopterus javanensis found in paddy fields the time of maturation of its gonads was studied by using the gonadal somatic index. The peak gonadal somatic index was first found during the ploughing and seedling seasons in 2011 and 2012. This was accompanied by the yellowish egg sac observation made in the eels during the ploughing and seedling seasons which was indicative of the mid- and early maturation stages of the gonads. However the decline in GSI from the growing until the harvesting seasons indicated the poor development of gonads since differentiating the sex of the eels was hard. This could be due to the heavy application of pesticides and fertilisers during the growing season as cadmium present as impurities in the fertilisers which slowly accumulated in the gonads. The findings highlighted the availability of Asian swamp eels for local eel collectors as part of their income and the complexity of heavy metal bioaccumulation in their gonads for safe eel consumption. Overall the habitat of the Asian swamp eels may induce the differences in the maturation timing for the species.

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Item Type:	Article
AGROVOC Term:	Eels
AGROVOC Term:	Monopterus
AGROVOC Term:	Reproductive physiology
AGROVOC Term:	Rice fields
AGROVOC Term:	Crop management
AGROVOC Term:	Gonads
AGROVOC Term:	Pesticides
AGROVOC Term:	Fertilisers
AGROVOC Term:	Heavy metals
AGROVOC Term:	Bioaccumulation
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/9077

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