Embryonic and larval development of macrobrachium neglectum (de Han, 1905)

Zainal Abidin, Hasyimah (2023) Embryonic and larval development of macrobrachium neglectum (de Han, 1905). [Project Paper] (Submitted)

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Abstract

Macrobrachium neglectus de Man, 1905 is one of the freshwater shrimp's species that found within the river systems flowing in Universiti Putra Malaysia Campus Bintulu, Sarawak. Adult prawns can normally grow up from 10cm – 15cm in size. The nutritional requirements have thus far not been studied and standardized. Thus far there have been no scientific studies on this species regarding embryonic development and total larval stages. The objective of this study is to observe the embryonic and early larval development of M. neglectum (de Han,1905). M. neglectum eggs developed in 15 days under laboratory conditions. The embryo occupies all the available space inside the eggs, with traces of yolk remaining in most embryos. By day 10, the clear region, which developed into the trunk and caudal portion of the embryo, had taken up about two-thirds of the embryo mass. The embryo's eyes grew larger and oval after 11 days. M. neglectum larvae go through 11 to 12 moults from hatching through transformation into juveniles. The freshwater prawn M. neglectum has a high fecundity proportional to the size of its female specimen. It incubates its eggs for 141 days at 28°C, which is shorter than other species such as M. rosenbergii and M. olfersi. M. potiuma eggs can hatch in 0 ppt. M. neglectum eggs' colour ranged from dark olive to light olive to yellowish until visible color before hatching. Macrobrachium spp. produce larvae with oceanic salinity requirements (30-35 ppt). M. neglectum's larval characteristics suggest a closer relationship with M. rosernbergii and M. lar, both subtropical species. Mating, fertilisation, embryonic development and larval development all occur in freshwater in M. neglectum. Eggs hatch in salinity-free, 100% freshwater. A larva takes 10 days to metamorphose into a post-larva. More research is needed to increase larval survival.

Item Type:	Project Paper
Faculty:	Faculty of Agriculture and Forestry Sciences
Depositing User:	Ms. Siti Sunarti Waini Osman
Date Deposited:	18 Dec 2023 00:54
Last Modified:	18 Dec 2023 00:54
URI:	http://psaspb.upm.edu.my/id/eprint/1623

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