Instars number and instars duration during larval life cycle of Macrobrachium gangeticum (Bate)

Mishra P., . and Kanaujia D. R., . and Bohidar K., . Instars number and instars duration during larval life cycle of Macrobrachium gangeticum (Bate). pp. 1059-1069. ISSN 0116-6514

This experiment was conducted in 250 ml beakers and 300 L plastic pools to find out the instars duration (duration between two moults) total duration and instars number (larval moult) during the larval cycle of Macrobrachium gangeticum. The instars duration from stages I-V was 8-14 days (10.4 2.88 days) recorded in 250 ml beakers which was comparatively longer than that of the plastic pools at 5-7 days (5.75 0.957 days). Similar trend with a slight increase of 12-16 days (14.2 1.788 days) in instars duration in beaker was observed between stages V-VI and found much shorter duration of 5-6 days (5.250.5 days) in plastic pools. Further a comparatively longer instars duration of 19-27 days (22.6 1.788 days) was observed between stages VI-XI in beaker than in plastic pools of 8-10 days (9.01.154 days). Same trend existed at later stages XI-PL which was slightly longer in both treatments i.e. 9-10 days (9.6 0.547 days) in beakers and 2-3 days (2.50.577 days) in plastic pools. The total instars duration of 49-62 days (57.4 4.929 days) from stage I-PL was recorded in 250 ml beakers which was comparatively much longer than that of 300 l plastic pools of 20-25 days (22.5 2.380 days). The instars number (number of moults) varied significantly during the larval cycle of M. gangeticum carried out in 250 ml beakers. Zoea I passed through 11 distinct larval stages to attain post larval stage. A minimum of 4 moults from stages I-V and a maximum of 5-7 moults (5.81.095) between stages V-VI thereafter 5-9 moults (7.42.28) from stages VI-XI and 4-5 moults (4.250.44) between stages XI-PL were recorded in this species.

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Abstract

This experiment was conducted in 250 ml beakers and 300 L plastic pools to find out the instars duration (duration between two moults) total duration and instars number (larval moult) during the larval cycle of Macrobrachium gangeticum. The instars duration from stages I-V was 8-14 days (10.4 2.88 days) recorded in 250 ml beakers which was comparatively longer than that of the plastic pools at 5-7 days (5.75 0.957 days). Similar trend with a slight increase of 12-16 days (14.2 1.788 days) in instars duration in beaker was observed between stages V-VI and found much shorter duration of 5-6 days (5.250.5 days) in plastic pools. Further a comparatively longer instars duration of 19-27 days (22.6 1.788 days) was observed between stages VI-XI in beaker than in plastic pools of 8-10 days (9.01.154 days). Same trend existed at later stages XI-PL which was slightly longer in both treatments i.e. 9-10 days (9.6 0.547 days) in beakers and 2-3 days (2.50.577 days) in plastic pools. The total instars duration of 49-62 days (57.4 4.929 days) from stage I-PL was recorded in 250 ml beakers which was comparatively much longer than that of 300 l plastic pools of 20-25 days (22.5 2.380 days). The instars number (number of moults) varied significantly during the larval cycle of M. gangeticum carried out in 250 ml beakers. Zoea I passed through 11 distinct larval stages to attain post larval stage. A minimum of 4 moults from stages I-V and a maximum of 5-7 moults (5.81.095) between stages V-VI thereafter 5-9 moults (7.42.28) from stages VI-XI and 4-5 moults (4.250.44) between stages XI-PL were recorded in this species.

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Item Type:	Article
AGROVOC Term:	Macrobrachium
AGROVOC Term:	Decapoda
AGROVOC Term:	Aquatic animals
AGROVOC Term:	Aquatic organisms
AGROVOC Term:	Instars
AGROVOC Term:	Larvae
AGROVOC Term:	Laboratories
AGROVOC Term:	Experiments
AGROVOC Term:	Moulting
AGROVOC Term:	Life cycle
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:53
URI:	http://webagris.upm.edu.my/id/eprint/7848

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