Effect of alkalinity on fecundity of Caligus minimus parasitizing on seabass (Lates calcarifer) in laboratory condition

Nguyen Khoa Duy Tran, . and Faizah Sharom Harison, . and Suhairi Mazelan, . and Sabri Muda, . Effect of alkalinity on fecundity of Caligus minimus parasitizing on seabass (Lates calcarifer) in laboratory condition. pp. 50-60. ISSN 1823-8556

Caligid copepod is one of the most common parasites in marine fish culture causing negative effects on growth and survival of its host. This study aims to assess the fecundity of Caligus minimus parasitizing on seabass (Lates calcarifer) and evaluate the parasites abundance dynamics under various alkalinity levels. Wild C. minimus were recorded with 60.9 14.3 eggs in its egg string which varies in length (3.38 0.27 mm) and egg sizes ranging from 0.34 mm (width) to 0.08 mm (length). Wild C. minimus were observed to attach and survive on its host for 50 to 71 days producing one to three egg strings in its life. Under 60 ppm and 70 ppm of alkalinity condition the abundance and hatching index of Caligus reached a peak of 734 14.5 and 919 25.5 of the initial infection. There were no records of hatching at 10 20 110 and 120 ppm of alkalinity. Within 21 days no significant difference in the number of egg and egg size under various alkalinity levels were observed. These results demonstrated that alkalinity strongly affects the population of caligid parasites.

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Abstract

Caligid copepod is one of the most common parasites in marine fish culture causing negative effects on growth and survival of its host. This study aims to assess the fecundity of Caligus minimus parasitizing on seabass (Lates calcarifer) and evaluate the parasites abundance dynamics under various alkalinity levels. Wild C. minimus were recorded with 60.9 14.3 eggs in its egg string which varies in length (3.38 0.27 mm) and egg sizes ranging from 0.34 mm (width) to 0.08 mm (length). Wild C. minimus were observed to attach and survive on its host for 50 to 71 days producing one to three egg strings in its life. Under 60 ppm and 70 ppm of alkalinity condition the abundance and hatching index of Caligus reached a peak of 734 14.5 and 919 25.5 of the initial infection. There were no records of hatching at 10 20 110 and 120 ppm of alkalinity. Within 21 days no significant difference in the number of egg and egg size under various alkalinity levels were observed. These results demonstrated that alkalinity strongly affects the population of caligid parasites.

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Item Type:	Article
AGROVOC Term:	Caligus
AGROVOC Term:	Copepoda
AGROVOC Term:	Parasites
AGROVOC Term:	Lates calcarifer
AGROVOC Term:	Sea bass
AGROVOC Term:	Fecundity
AGROVOC Term:	Alkalinity
AGROVOC Term:	Eggs
AGROVOC Term:	Egg hatching
AGROVOC Term:	Survival
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:53
URI:	http://webagris.upm.edu.my/id/eprint/7801

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