Study on Relationship Between Odor Material Geosmin and Environmental Factors in Aquaculture Ponds

doi:10.11924/j.issn.1000-6850.casb2024-0114

Abstract

Abstract:

This study aims to analyze one of the main obstacles in the consumption and processing of freshwater fish products - the earthy smell, especially its key odorant compound geosmin (GSM). By testing the GSM concentration in 84 aquaculture ponds in Jiangsu Province and their water environmental factors (including salinity, pH, dissolved oxygen, temperature, total suspended solids, total nitrogen, total phosphorus, and permanganate index), correlation analysis and path analysis methods were used to screen out the key environmental factors affectingGSM. The results show that the detection rate of GSM in all ponds is as high as 97.6%, with an average detected content of (27.83±20.06) ng/L, which largely exceeds the human perception threshold; salinity and permanganate index have a significant negative impact on GSM, and the direct effects of both salinity and permanganate index are greater than their indirect effects, with these two factors independently playing a negative regulatory role in the GSM of aquaculture ponds. Therefore, in the process of aquaculture management, salinity and permanganate index can be taken as the key environmental factors for monitoring the water environment of aquaculture ponds, targeted management measures can be adopted accordingly, thereby improving the water quality of aquaculture ponds and more effectively and conveniently solving the problem of earthy smell in aquaculture water bodies and products.

Key words: odor material, geosmin, aquaculture pond, salinity, permanganate index, water body environmental factors, earthy-musty odor, aquaculture management

ZHONG Liqiang, ZHOU Liying, ZHANG Shiyong, LIU Hongyan, CHEN Xiaohui, WANG Minghua. Study on Relationship Between Odor Material Geosmin and Environmental Factors in Aquaculture Ponds[J]. Chinese Agricultural Science Bulletin, 2024, 40(27): 159-164.

Figures/Tables 5

References 39

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环境因子	盐度/‰	pH	溶氧/(mg/L)	温度/℃	总悬浮物/(mg/L)	总氮/(mg/L)	总磷/(mg/L)	高锰酸盐指数/(mg/L)	GSM/(ng/L)
平均值(Mean)	12.53	8.54	12.49	28.51	70.69	3.38	0.38	16.70	27.83
标准差(SD)	9.71	0.27	3.87	1.21	171.28	3.31	0.53	8.19	20.06
变异系数(CV/%)	77.49	3.16	30.98	4.24	242.30	20.54	97.93	49.04	72.08

环境因子	盐度/‰	pH	溶氧/(mg/L)	温度/℃	总悬浮物/(mg/L)	总氮/(mg/L)	总磷/(mg/L)	高锰酸盐指数/(mg/L)	GSM/(ng/L)
平均值(Mean)	12.53	8.54	12.49	28.51	70.69	3.38	0.38	16.70	27.83
标准差(SD)	9.71	0.27	3.87	1.21	171.28	3.31	0.53	8.19	20.06
变异系数(CV/%)	77.49	3.16	30.98	4.24	242.30	20.54	97.93	49.04	72.08

指标	盐度		pH			溶氧		温度		总悬浮物		总氮		总磷
盐度	1
pH	0.019		1
溶氧	-0.111		0.236^*			1
温度	-0.018		0.075			0.210		1
总悬浮物	0.056		-0.312^**			-0.173		-0.124		1
总氮	-0.139		-0.137			-0.104		0.013		0.282^**		1
总磷	-0.172		-0.015			0.298^**		0.035		0.011		0.186		1
高锰酸盐指数		0.061		0.044	0.150		0.034		0.177		0.433^***		0.516^***		1
GSM		-0.312^**		0.135	0.039		-0.061		0.041		-0.057		0.046		-0.222^*	1

指标	盐度		pH			溶氧		温度		总悬浮物		总氮		总磷
盐度	1
pH	0.019		1
溶氧	-0.111		0.236^*			1
温度	-0.018		0.075			0.210		1
总悬浮物	0.056		-0.312^**			-0.173		-0.124		1
总氮	-0.139		-0.137			-0.104		0.013		0.282^**		1
总磷	-0.172		-0.015			0.298^**		0.035		0.011		0.186		1
高锰酸盐指数		0.061		0.044	0.150		0.034		0.177		0.433^***		0.516^***		1
GSM		-0.312^**		0.135	0.039		-0.061		0.041		-0.057		0.046		-0.222^*	1

变量	偏回归系数	t值	P
常量	-65.029	-0.768	0.445
盐度	-0.573	-2.544	0.013
pH	15.893	1.928	0.058
溶氧	-0.016	-0.026	0.979
温度	-0.900	-0.513	0.610
总悬浮物	0.020	1.523	0.132
总氮	-0.021	-0.028	0.978
总磷	6.546	1.347	0.182
高锰酸盐指数	-0.810	-2.403	0.019