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Health Status of Cultured Shrimp (penaeus Monodon) in Cox's Bazar Region

MD. ASEK UDDIN
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

GIAS UDDIN AHMED
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

A study was carried out for a period 8 months from March 2018 to October 2018 to observe the health status of shrimp (Penaeus monodon) in three Upazilas viz., Cox’s Bazar Sadar, Teknaf and Maheshkhali of Cox’s Bazar district through clinical and histological procedures. Data were collected through personal contact, questionnaire interview and discussion with key informants. Clinically, shrimp from Beximco shrimp farm and Aquaculture Farm Limited at Cox’s Bazar Sadar Upazila, Unique Aquaculture at Teknaf Upazila were found to be healthy during summer. During rainy season, shrimps of Teknaf Upazila were affected with early mortality syndrome (EMS) like clinical signs within 30 days of stocking where major signs were lethargy, darkened khosa and moulting of the carapace were present. White spot syndrome (WSS) affected shrimp were collected from Teknaf Upazila having loose cuticle and the presence of white spots inside the carapace and appendages. From histological observation the structure of shrimp muscle and hepatopancreas from Aquaculture Farm Limited, Beximco shrimp farm of Cox’s Bazar Sadar Upazila and Unique Aquaculture of Teknaf Upazila were almost normal. During rainy season there were some remarkable pathological changes like parasitic cyst, vacuum, pyknotic cell, acanthocephalan parasite, hemorrhage and necrosis. Cultured shrimps in rainy season were affected more than those of summer season. However, shrimp of summer season had reduced pathological changes in hepatopancreas than those of rainy season. From clinical, histological and pathological point of view healthy shrimp were noticed in summer and moderately infected in rainy season. It could be mentioned that production and health status of shrimp were increased in summer season of Cox’s Bazar area compared with other areas and season (rainy). Thus necessary measures need to be taken especially during rainy season.

Keywords: Penaeus monodon, Shrimp farms, Cox’s Bazar

Location: Three Upazilas viz., Cox’s Bazar Sadar, Teknaf and Maheshkhali of Cox’s Bazar district, Bangladesh

Start Date: 00-03-2017

End Date: 00-10-2018

Program Area: Animal Health and Management

Commodity: Shrimp

Objectives:

To observe the health status of shrimp (Penaeus monodon) in three Upazilas viz., Cox’s Bazar Sadar, Teknaf and Maheshkhali of Cox’s Bazar district

Methodology:

Study area: The study was conducted from March to October, 2018 at three different Upazilas viz., Cox’s Bazar Sadar, Teknaf and Maheshkhali of Cox’s Bazar district. Data collection: Data were collected through questionnaire interview with shrimp farmers considering two farms from each Upazila. For questionnaire interview a set of questionnaire was developed composed of open form of questions. A total 36 farmers were personally interviewed including 6 key informants. Sample collection: Shrimp samples were collected from ponds and ghres of three sampling stations (Upazilas) at two months’ interval. For clinical signs collected shrimp were examined by naked eye to observe any superficial injury, infection, and other abnormalities in live condition. For histological observation samples were collected from hepatopancreas and muscle of shrimp fixed in Davidson fixative (1:10). Then samples were dehydrated, cleared and infiltration through Automatic Tissue Processors (Citade l1000), sectioned and stained with hematoxylin and eosin. The sections were examined under a compound photomicroscope. Record of hepatopancreas and muscle were done farm-wise and season-wise.

Source of Information: Bangladesh J. Fish. (2019) 31(2) : 295-303

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Variations were evident in the structure of hepatopancreas as well. Hepatopancreas were almost normal in most of the investigated farms of Cox’s Bazar Sadar and Teknaf Upazila during summer. However, there were minor pathology like vacuum, necrosis in MKA shrimp farm, Zaman and Rabiul’s gher during summer. Whereas, during rainy season vacuums, necrosis, pyknotic cell, microsporidian cyst and hemorrhage were found in farms of Maheshkhali, Cox’s Bazar Sadar and Teknaf Upazilas. Shrimp collected from Zaman’s gher of Maheshkhali Upazila had the acanthocephalan parasites, necrosis and vacuums during rainy season. In the present study, shrimp production was recorded from 1050 kg/ha to 11,795 kg/ha in the study areas. The highest production was recorded from Aquaculture Farm Limited at Cox’s Bazar Sadar and the lowest was from Zaman’s gher at Maheshkhali Upazila.

Knowledge Management: Journal