Morphological Study of Larval Development and the Transition to Juvenile Stage in Thin-Lipped Mullet, Liza Ramada

Mousa, Mostafa A.; Khalil, Noha A.; El-Gohary, Nawal M.

doi:10.21608/ejh.2020.22769.1236

Morphological Study of Larval Development and the Transition to Juvenile Stage in Thin-Lipped Mullet, Liza Ramada

Document Type : Original Article

Authors

¹ national institute of oceanography and fisheries

² Fish Reproduction Laboratory, National Institute of Oceanography and Fisheries, Alexandria, Egypt,

³ Faculty of Science, Gazan University, KSA

10.21608/ejh.2020.22769.1236

Abstract

Introduction: The detailed description of larval and juvenile stages of L. ramada is so far lacking.
Aim of the Work: The present study aimed to describe larval development and the morphological transition to the juvenile stage in L. ramada after artificial spawning.
Material and Methods: In this study, we described early development of Liza ramada over the early rearing period of 63 days post-hatching.
Results: The newly hatched larvae have closed mouth and anus. At seven days post-hatching, the larvae have opened mouth and both yolk sac and oil globules disappeared. At 14 days, larvae have a distinct fins and increased skin pigmentation. At 21 days post-hatching, the larvae have variable coloration with more density. At 28 days post-hatching, the body depth of larvae increased and the stomach contains some food indicating the larval ability to digest external food. In 35 days-old larvae, the eyes become fully pigmented. At 42 days post-hatching, the larvae have high density of pigmentation all over the body and transparent caudal fin with rays. At 49 days post-hatching, the body of juvenile is distinctly elongated and laterally compressed with obvious scales. By 56 days post-hatching, the fish is covered with scales and well-developed rays. At 63 days post-hatching, the body becomes large and completely covered with scales and high density of pigmentation. The larvae begin transformation to juvenile stage at 42 days post-hatching and then finished the transformation at 63 days post-hatching. Importantly, the juvenile stage of L. ramada can be handled safely at 63 days post-hatching.
Conclusion: The juvenile’s production of L. ramada requires a period of 63.

Keywords