Authors:
John D. Smith,
Alice B. Johnson,
Robert L. Thompson,
Emily R. Davis
Affiliations:
1. State University of Brazil, Faculty of Agricultural and Veterinary Sciences, Department of Applied Biology, Invertebrate Morphology Laboratory, Jaboticabal, Brazil.
2. State University of Brazil, Faculty of Agricultural and Veterinary Sciences, Department of Applied Biology, Invertebrate Morphology Laboratory, Jaboticabal, Brazil.
3. Laboratory of Bioecology and Crustacean Systematics, Department of Biology, University of São Paulo, Ribeirão Preto, Brazil.
4. State University of Brazil, Faculty of Agricultural and Veterinary Sciences, Department of Applied Biology, Invertebrate Morphology Laboratory, Jaboticabal, Brazil.
PMID: 32933718
DOI: 10.1016/j.tice.2020.101395
Abstract
This study investigates the ovarian development of Callinectes ornatus and Arenaeus cribrarius through histochemical and ultrastructural analyses. Both crab species exhibit parallel ovarian stages: juvenile (JUV), adult rudimentary (RUD), developing (DEV), intermediary (INT), mature (MAT), and spent (OV). The JUV and RUD stages share similar traits, with previtellogenesis marked by meiotic prophase chromosomes. In primary vitellogenesis, the oocyte cytoplasm contains numerous glycoprotein vesicles, both small and large, which originate from the dilated cisternae of the rough endoplasmic reticulum (RER) that generates immature (endogenous) yolk. The secondary vitellogenesis phase (exogenous) commences during the DEV stage, characterized by the merger of pinocytic vesicles and immature yolk vesicles into mature yolk granules. As the INT stage progresses, chorion formation initiates, and mature yolk granules increase in both size and quantity, while RER diminishes. By the MAT stage, fully developed oocytes appear, filled with mature yolk, lipid droplets, and glycogen. Notably, there are no significant differences observed in the gonadosomatic and hepatosomatic indices, suggesting a consistent transfer of reserves from the hepatopancreas throughout ovarian development, as evidenced by the presence of both primiparous and multiparous females in the same sampled group.
Keywords:
Gonadosomatic index (GSI), Hepatosomatic index (HSI), Histology, Oocyte, Transmission electron microscopy.
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To Summarize:
This research elucidates the ovarian development stages in two swimming crab species, highlighting the histochemical and ultrastructural features that define each stage. The findings suggest a stable transfer of energy reserves during development, with implications for understanding reproductive strategies in these crustaceans.