Distribution and size composition of penaeid prawns, Penaeus monodon and Penaeus indicus in Saadan estuarine area, Tanzania

Erastus John Mosha, Wenresti Glino Gallardo

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Penaeus monodon and Penaeus indicus are found in sandy beaches and mangrove areas in Saadan estuary (Tanzania). Artisanal prawn fishers harvest penaeids in the estuary all year-round causing growth overfishing and reduction of broodstock which in turn affect inshore recruitment and offshore stock recovery. Scientific information on the distribution of penaeid prawns in the estuaries based on Codex Alimentarius Commission Grading Systems for Capture and Culture Prawns is lacking, which is an obstacle for fisheries management. This study investigated the distribution and size composition of two major commercial species of prawns in Tanzania, P.monodon and P.indicus in Saadan estuary. Environmental parameters such as water temperature, salinity, substrate particle size and substrate's organic matter were investigated. The area was divided into 5 transects, each 3.7km apart and perpendicular to the estuary. Samplings were conducted three times per month from January to April 2011 and 2012 respectively, the period that represents two seasons: dry season (January to February) and wet season (March to April) the peak season for prawn fishery in Saadan estuary. Data of exported prawns from all estuaries country-wide were collected and the number of individuals of F2 generation was projected. The study found that salinity affects distribution and the estuary contains all prawns categories based on Codex Alimentarius Grading System for Capture and Culture Prawns particularly during the peak season hence, proposes temporal closure from fishing by artisanal prawn fishers during the wet season to prevent overharvesting of spawners to enhance prawn recruitment and stock recovery.

Original languageEnglish
Pages (from-to)51-63
Number of pages13
JournalOcean and Coastal Management
Volume82
DOIs
Publication statusPublished - 2013

Fingerprint

Fenneropenaeus indicus
Penaeidae
Penaeus monodon
Tanzania
estuaries
estuary
shrimp
prawn culture
Codex Alimentarius
shrimp culture
wet season
prawn fishery
Monodon
salinity
substrate
commercial species
breeding stock
distribution
overfishing
fishery management

ASJC Scopus subject areas

  • Management, Monitoring, Policy and Law
  • Aquatic Science
  • Oceanography

Cite this

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title = "Distribution and size composition of penaeid prawns, Penaeus monodon and Penaeus indicus in Saadan estuarine area, Tanzania",
abstract = "Penaeus monodon and Penaeus indicus are found in sandy beaches and mangrove areas in Saadan estuary (Tanzania). Artisanal prawn fishers harvest penaeids in the estuary all year-round causing growth overfishing and reduction of broodstock which in turn affect inshore recruitment and offshore stock recovery. Scientific information on the distribution of penaeid prawns in the estuaries based on Codex Alimentarius Commission Grading Systems for Capture and Culture Prawns is lacking, which is an obstacle for fisheries management. This study investigated the distribution and size composition of two major commercial species of prawns in Tanzania, P.monodon and P.indicus in Saadan estuary. Environmental parameters such as water temperature, salinity, substrate particle size and substrate's organic matter were investigated. The area was divided into 5 transects, each 3.7km apart and perpendicular to the estuary. Samplings were conducted three times per month from January to April 2011 and 2012 respectively, the period that represents two seasons: dry season (January to February) and wet season (March to April) the peak season for prawn fishery in Saadan estuary. Data of exported prawns from all estuaries country-wide were collected and the number of individuals of F2 generation was projected. The study found that salinity affects distribution and the estuary contains all prawns categories based on Codex Alimentarius Grading System for Capture and Culture Prawns particularly during the peak season hence, proposes temporal closure from fishing by artisanal prawn fishers during the wet season to prevent overharvesting of spawners to enhance prawn recruitment and stock recovery.",
author = "Mosha, {Erastus John} and Gallardo, {Wenresti Glino}",
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T1 - Distribution and size composition of penaeid prawns, Penaeus monodon and Penaeus indicus in Saadan estuarine area, Tanzania

AU - Mosha, Erastus John

AU - Gallardo, Wenresti Glino

PY - 2013

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N2 - Penaeus monodon and Penaeus indicus are found in sandy beaches and mangrove areas in Saadan estuary (Tanzania). Artisanal prawn fishers harvest penaeids in the estuary all year-round causing growth overfishing and reduction of broodstock which in turn affect inshore recruitment and offshore stock recovery. Scientific information on the distribution of penaeid prawns in the estuaries based on Codex Alimentarius Commission Grading Systems for Capture and Culture Prawns is lacking, which is an obstacle for fisheries management. This study investigated the distribution and size composition of two major commercial species of prawns in Tanzania, P.monodon and P.indicus in Saadan estuary. Environmental parameters such as water temperature, salinity, substrate particle size and substrate's organic matter were investigated. The area was divided into 5 transects, each 3.7km apart and perpendicular to the estuary. Samplings were conducted three times per month from January to April 2011 and 2012 respectively, the period that represents two seasons: dry season (January to February) and wet season (March to April) the peak season for prawn fishery in Saadan estuary. Data of exported prawns from all estuaries country-wide were collected and the number of individuals of F2 generation was projected. The study found that salinity affects distribution and the estuary contains all prawns categories based on Codex Alimentarius Grading System for Capture and Culture Prawns particularly during the peak season hence, proposes temporal closure from fishing by artisanal prawn fishers during the wet season to prevent overharvesting of spawners to enhance prawn recruitment and stock recovery.

AB - Penaeus monodon and Penaeus indicus are found in sandy beaches and mangrove areas in Saadan estuary (Tanzania). Artisanal prawn fishers harvest penaeids in the estuary all year-round causing growth overfishing and reduction of broodstock which in turn affect inshore recruitment and offshore stock recovery. Scientific information on the distribution of penaeid prawns in the estuaries based on Codex Alimentarius Commission Grading Systems for Capture and Culture Prawns is lacking, which is an obstacle for fisheries management. This study investigated the distribution and size composition of two major commercial species of prawns in Tanzania, P.monodon and P.indicus in Saadan estuary. Environmental parameters such as water temperature, salinity, substrate particle size and substrate's organic matter were investigated. The area was divided into 5 transects, each 3.7km apart and perpendicular to the estuary. Samplings were conducted three times per month from January to April 2011 and 2012 respectively, the period that represents two seasons: dry season (January to February) and wet season (March to April) the peak season for prawn fishery in Saadan estuary. Data of exported prawns from all estuaries country-wide were collected and the number of individuals of F2 generation was projected. The study found that salinity affects distribution and the estuary contains all prawns categories based on Codex Alimentarius Grading System for Capture and Culture Prawns particularly during the peak season hence, proposes temporal closure from fishing by artisanal prawn fishers during the wet season to prevent overharvesting of spawners to enhance prawn recruitment and stock recovery.

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