Polychaete consumption increased prostaglandin biosynthesis in female Penaeus monodon

Oct 28, 2020Reproduction (Cambridge, England)

Eating Polychaete Worms Increases Prostaglandin Production in Female Black Tiger Shrimp

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Abstract

Female black tiger shrimp Penaeus monodon fed with polychaetes showed higher levels of arachidonic acid, eicosapentaenoic acid, and prostaglandins compared to those fed with commercial feed pellets.

Polychaetes are preferred for ovarian maturation in shrimp over commercial feed pellets.
Higher levels of prostaglandins in polychaetes may enhance ovarian development in shrimp.
Shrimp fed with polychaetes had increased levels of eicosapentaenoic acid and prostaglandins in their hepatopancreases.
In ovaries, polychaete feeding resulted in elevated levels of arachidonic acid and higher transcription of genes related to prostaglandin biosynthesis.
The combination of polychaete feeding and eyestalk ablation increased levels of key fatty acids and transcription levels of relevant enzymes.
Dietary intake of high levels of arachidonic acid, eicosapentaenoic acid, and prostaglandins may be crucial for ovarian development in shrimp.

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The polychaete Perinereis nuntia is preferred over commercial feed pellets for boosting ovarian maturation of the female black tiger shrimp Penaeus monodon. High levels of prostaglandins in polychaetes are believed to enhance shrimp ovarian development. However, the impact of polychaete feeding on shrimp prostaglandin biosynthesis and fatty acid regulatory pathways have yet to be investigated. As polychaetes contain higher levels of arachidonic acid (ARA), eicosapentaenoic acid (EPA), prostaglandin E2 (PGE2) and prostaglandin F2α (PGF2α) than feed pellets, we examined the effects of polychaete feeding alone and in combination with eyestalk ablation on shrimp hepatopancreases and ovaries. Shrimp fed with polychaetes contained higher levels of EPA, PGE2 and PGF2α in hepatopancreases than those of pellet-fed shrimp. Similarly, higher levels of ARA and higher transcription levels of cyclooxygenase (COX) and prostaglandin F synthase (PGFS) were detected in ovaries of polychaete-fed shrimp compared to those of pellet-fed shrimp. The combination of polychaete-feeding and eyestalk ablation, commonly practiced to induce ovarian development, increased levels of ARA and EPA and transcription levels of COX in hepatopancreases and ovaries of polychaete-fed shrimp compared to those of pellet-fed shrimp. In ovaries, prostaglandin biosynthesis gene transcripts were induced by polychaete feeding while transcriptional levels of fatty acid regulatory genes were regulated by shrimp feed and eyestalk ablation. Our findings not only elucidate the effects of polychaete consumption on shrimp prostaglandin biosynthesis and fatty acid regulatory pathways during larvae production, but also suggests that high levels of dietary ARA, EPA and prostaglandins are essential during P. monodon ovarian development.

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Polychaete consumption increased prostaglandin biosynthesis in female Penaeus monodon

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