Ontogeny of lymphoid organs in the Asian sea bass (Lates calcarifer Bloch)

Subburaj R., . and Thirunavukkarasu A. R., . and Rajan J. J. S., . and Azad I. S., . and Kailasam M., . Ontogeny of lymphoid organs in the Asian sea bass (Lates calcarifer Bloch). pp. 901-913. ISSN 0116-6514

Ontogeny of the lymphoid organs of hatchery-reared larvae/juveniles Lates calcarifer (Bloch) was studied from zero day post hatch (dph) to 60 dph. Histological sections of the samples collected at daily intervals from zero dph till 25 dph and at weekly intervals till 60 dph were examined. The thymus was first noticed at 2 dph as a bi-lobed organ situated dorso-posteriorly in the oro-pharyngeal cavity in the angle between the opercular bone and the head bone. The lymphoid kidney (pronephros) was seen with undifferentiated stem cells at 2 dph though the excretory kidney tubules were noticed at zero dph. The developed kidney runs ventral to the vertebral column all along the length of the peritoneal cavity distinctly bi-lobed at its proximal end forming the head-kidney and fused in the mid and tail kidney portions. The spleen seen mostly as an erythropoietic organ is capsulated and appeared at 2 dph attached to the mesogastrium. The sequence of development of these lymphoid organs was: the thymus (2 dph) the kidney (excretory kidney-0 dph and lymphoid kidney -2dph) the spleen (2 dph) and the gut associated lymphoid tissue (GALT 5 dph). Various cellular components of these lymphoid organs and their probable role in immune response of the fish have been discussed.

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Abstract

Ontogeny of the lymphoid organs of hatchery-reared larvae/juveniles Lates calcarifer (Bloch) was studied from zero day post hatch (dph) to 60 dph. Histological sections of the samples collected at daily intervals from zero dph till 25 dph and at weekly intervals till 60 dph were examined. The thymus was first noticed at 2 dph as a bi-lobed organ situated dorso-posteriorly in the oro-pharyngeal cavity in the angle between the opercular bone and the head bone. The lymphoid kidney (pronephros) was seen with undifferentiated stem cells at 2 dph though the excretory kidney tubules were noticed at zero dph. The developed kidney runs ventral to the vertebral column all along the length of the peritoneal cavity distinctly bi-lobed at its proximal end forming the head-kidney and fused in the mid and tail kidney portions. The spleen seen mostly as an erythropoietic organ is capsulated and appeared at 2 dph attached to the mesogastrium. The sequence of development of these lymphoid organs was: the thymus (2 dph) the kidney (excretory kidney-0 dph and lymphoid kidney -2dph) the spleen (2 dph) and the gut associated lymphoid tissue (GALT 5 dph). Various cellular components of these lymphoid organs and their probable role in immune response of the fish have been discussed.

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Item Type:	Article
AGROVOC Term:	Lates
AGROVOC Term:	Lates calcarifer
AGROVOC Term:	Sea bass
AGROVOC Term:	Fishes
AGROVOC Term:	Aquatic animals
AGROVOC Term:	Aquatic organisms
AGROVOC Term:	Animal histology
AGROVOC Term:	Immune response
AGROVOC Term:	Intestines
AGROVOC Term:	Ontogeny
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:53
URI:	http://webagris.upm.edu.my/id/eprint/7839

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