Journal
TURKISH JOURNAL OF FISHERIES AND AQUATIC SCIENCES
Volume 22, Issue 9, Pages -Publisher
CENTRAL FISHERIES RESEARCH INST
DOI: 10.4194/TRJFAS20810
Keywords
Maturation Germ cell; Gonad histology; L. rohita; O. niloticus
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Funding
- Department of Science and Technology [DST/INSPIRES Fellowship/2014/IF140860, I-108]
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This study assessed the seasonal changes in germ cells and maturation of Labeo rohita and Oreochromis niloticus. It revealed different spawning behaviors and germ cell proliferation patterns in the two species. The study provided insights into the reproductive status of fish in response to seasonal climate changes and proposed comparative models for germ cell proliferation and maturation. Scanning electron microscope analysis also showed different developmental stages of germ cells in different seasons.
The present work assessed the seasonal changes in germ cells (GC) and the maturation of rohu, Labeo rohita and tilapia, Oreochromis niloticus. Here, we showed two species representing two diverse types of spawning behavior, having two distinct GC proliferation and spawning patterns. During July, a single peak spawning season for rohu was recorded with the highest GSI (female: 19.5 +/- 1.29 and male 4.2 +/- 0.24), which is the peak monsoon time in Eastern India. However, two peak spawning seasons were marked in tilapia during the pre-monsoon (April) and post-monsoon (October) period with GSI values of male: 0.9 +/- 0.21, female: 3.9 +/- 1.32 and male: 1.1 +/- 0.3, female: 4.4 +/- 1.1 respectively. Gonadal histology in synchrony with GSI provides insights into the effects of various seasonal climate changes on the reproductive status of fish. Further, GC ultra-structure revealed various development stages in rohu and tilapia in different seasons using a scanning electron microscope. Here, comparative models were proposed for GC proliferation and maturation during different parts of the year in rohu and tilapia that may be used to plan breeding programs and hatchery management of these two species.
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