Genetic evidence for a single stock of giant tiger prawns Penaeus monodon in demarcated prawn fishing zones of Tanzania

Cyrus Rumisha; Marc Kochzius

doi:10.1111/fme.12598

Genetic evidence for a single stock of giant tiger prawns Penaeus monodon in demarcated prawn fishing zones of Tanzania

Cyrus Rumisha, Marc Kochzius

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Tanzania demarcated three prawn fishing zones along its coast to spread fishing pressure and help the prawn fishery to recover. However, it is unknown whether the demarcated zones correspond to the genetic stock structure of the world's most commercially important prawn, the giant tiger prawn (Penaeus monodon). Thus, this study used partial mitochondrial control region sequences (534 base pairs) to test the hypotheses that (1) giant tiger prawns in Tanzania's demarcated prawn fishing zones are a single stock and (2) the giant tiger prawns on the Tanzanian coast experienced a recent demographic expansion. The sequences showed high haplotype diversity (h = 0.998–1.0) and low nucleotide diversity (θ_π = 1.89%–2.24%). The neutrality test and mismatch analysis showed that the hypothesis of recent demographic expansion could not be rejected. The analysis of molecular variance revealed low and insignificant fixation indices between the zones (F_ST = 0.00025, p > 0.05; Φ_ST = −0.00027, p > 0.05), suggesting that the three demarcated fishing zones constitute a single stock and that fishers may be targeting the same stock. Furthermore, it was discovered that Zone 2 has the potential to replenish depleted areas; thus, it should be prioritised in future conservation planning.

Original language	English
Pages (from-to)	36-43
Number of pages	8
Journal	Fisheries Management and Ecology
Volume	30
Issue number	1
DOIs	https://doi.org/10.1111/fme.12598
Publication status	Published - Feb 2023

Bibliographical note

Funding Information:
This study was funded by the Vlaamse Interuniversitaire Raad through a scholarship given to the corresponding author. The authors are very thankful to colleagues in the Laboratory of Marine Biology (VUB) and the Department of Biosciences at SUA for their assistance during laboratory work. Last but not least, the Ministry of Livestock and Fisheries of the United Republic of Tanzania is gratefully acknowledged for providing the required licence and permits to collect and export tissue samples of giant tiger prawns.

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.

Keywords

gene flow
genetic connectivity
genetic population structure
Giant tiger shrimp
mitochondrial displacement loop (D-loop)

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10.1111/fme.12598

Cite this

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title = "Genetic evidence for a single stock of giant tiger prawns Penaeus monodon in demarcated prawn fishing zones of Tanzania",

abstract = "Tanzania demarcated three prawn fishing zones along its coast to spread fishing pressure and help the prawn fishery to recover. However, it is unknown whether the demarcated zones correspond to the genetic stock structure of the world's most commercially important prawn, the giant tiger prawn (Penaeus monodon). Thus, this study used partial mitochondrial control region sequences (534 base pairs) to test the hypotheses that (1) giant tiger prawns in Tanzania's demarcated prawn fishing zones are a single stock and (2) the giant tiger prawns on the Tanzanian coast experienced a recent demographic expansion. The sequences showed high haplotype diversity (h = 0.998–1.0) and low nucleotide diversity (θπ = 1.89%–2.24%). The neutrality test and mismatch analysis showed that the hypothesis of recent demographic expansion could not be rejected. The analysis of molecular variance revealed low and insignificant fixation indices between the zones (FST = 0.00025, p > 0.05; ΦST = −0.00027, p > 0.05), suggesting that the three demarcated fishing zones constitute a single stock and that fishers may be targeting the same stock. Furthermore, it was discovered that Zone 2 has the potential to replenish depleted areas; thus, it should be prioritised in future conservation planning.",

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author = "Cyrus Rumisha and Marc Kochzius",

note = "Funding Information: This study was funded by the Vlaamse Interuniversitaire Raad through a scholarship given to the corresponding author. The authors are very thankful to colleagues in the Laboratory of Marine Biology (VUB) and the Department of Biosciences at SUA for their assistance during laboratory work. Last but not least, the Ministry of Livestock and Fisheries of the United Republic of Tanzania is gratefully acknowledged for providing the required licence and permits to collect and export tissue samples of giant tiger prawns. Publisher Copyright: {\textcopyright} 2022 John Wiley & Sons Ltd.",

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Genetic evidence for a single stock of giant tiger prawns Penaeus monodon in demarcated prawn fishing zones of Tanzania

Abstract

Bibliographical note

Keywords

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