Effects of shrimp trawlers on the fisheries status and environment of the Northwest Arabian Gulf

Ali, Thamer S.

doi:10.3750/aip2001.31.2.06

Cited by 7 publications

(7 citation statements)

References 3 publications

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“…However, when only the most recent period 1990-2019 was considered, summer was found to be the longest season (126 days) followed by spring (83 days) and autumn (80 days). These results differ from the commonly hypothesized definition of seasons in the peninsula, in which summer is the longest season and spring and autumn are the shortest [17,18]. Ajjur and Al-Ghamdi's results are based on the use of multiple variables, many of which are upperlevel variables (i.e., synoptic-pattern-based).…”

Section: Introductioncontrasting

confidence: 58%

Climatology and Changes in Temperature Seasonality in the Arabian Peninsula

Alghamdi

2023

Atmosphere

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Changes in temperature seasonality influence a wide range of societal and natural activities. The characteristics of the temperature/thermal seasons in the Arabian Peninsula and how the seasons have changed remain unclear. Using observational and reanalysis data (1985–2022), this research (1) introduces a new approach to define seasons based on a hybrid hierarchical k-means clustering method, (2) documents the characteristics of temperature/thermal seasons, and (3) examines changes in the timings (onset and end) and lengths of the temperature seasons in the Peninsula. The results indicate that summer is the longest season (165 days), with the onset ranging from mid- to late April in the southern and northern Arabian Peninsula, respectively. Winter begins in late November and lasts until late February, with a length averaging around 92 days. Spring and autumn are the shortest seasons, lasting for about 52 days. The seasons demonstrate latitudinal patterns in their timings that correspond well to the seasonal changes in solar inclination. A trend analysis shows that summer is extending and becoming warmer, particularly at night. Winter is becoming shorter, with higher temperatures during both the day and night. Spring is starting and ending earlier, with a higher increase in the daytime temperature. The results of this research will be valuable in various applications relevant to sustainable ecosystems and human well-being.

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Section: Introductioncontrasting

confidence: 58%

Climatology and Changes in Temperature Seasonality in the Arabian Peninsula

Alghamdi

2023

Atmosphere

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“…The shrimp stock will be more destructed to serious consequences in the near future in case of no strict decision taken to limit the fishing effort to give the opportunity for the stock to restore. On the other hand, shrimp trawlers have considerably affect the marine habitats, as a result of dragging trawl net supplemented by heavy chain across the seabed, leads to significant levels of non target species as by-catch and substantially disturbs seabed ecosystem (5). No attempt has been made within the Bahraini territorial waters to identify the shrimp by-catch ratio and the impacts of shrimp trawlers on seabed environment.…”

Section: Crab Portunus Pelagicus (Gubgub)mentioning

confidence: 99%

Status of Commercial Fisheries in the Kingdom of Bahrain

Ali¹,

Abahussain²

2013

BJAS

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The present paper is concerned with annual catch of commercial fisheries in the Kingdom of Bahrain 2004-2009 based on landing statistics provided by the General Directorate for the Protection of Marine Resources. The Bahrain's fisheries are categorized into three fishing grounds; Northern, Eastern and Western areas. The northern area comprised the majority of the total fisheries accounting, as overall, 51.3% followed by the eastern area (38.7%) and the lowest from the western area (10%). In the northern area, the finfish fisheries forming 59.4% over the period 2004-2009 followed by shrimp fisheries (17.1%) then crab fisheries by 12.2%. The eastern fisheries showed that the crab fisheries formed the majority of the catch with an overall percentage 44.6%, followed by finfish fisheries (34.4%) and then shrimp fisheries (15.0%). However, in the western area, the results obviously revealed that finfish fisheries largely forming 60.8% of the total catch, followed by crab fisheries (29.1%), whereas the shrimp fisheries constituted 5.6%. The annual catch of six most commercial finfish species (Rabbit fish; Siganus canaliculatus, Groupers; Epinephelus coioides, Spangled Emperor; Lethrinus nebulosus, Spanish Mackerel; Scombermorous commerson, Doublebar Bream; Acanthopagrus bifaciatus and Grey Grunt; Plectorhinchus sordidus), shrimps; Penaeus semisulcatus and crabs; Portunus pelagicus have been investigated at each fishing ground and the average price rates were described. Generally, the results showed a decrease trend for commercial catches over the investigated period synchronized with noticeable increase in price rate. As a result of deterioration in fish stock due to overfishing and increasing in population growth rate by ~ 7% during 2000-2010, the per capita fish consumption substantially declined to less than 10 kg/year in 2009 in comparison with ~25 kg/year in the 1980s.

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“…Unlike in Kuwait (Morgan et al 1985), China (Shu and Qiu 2005), Bangladesh (Mustafa 1993;Mustafa 1999), Iran (Alit 2001;Mohamed et al 2008;Narges et al 2011;Hashemi et al 2012, Iraq (Nukpi 1996Salari 1996;Parsamanesh et al 2003;Mohamadi et al 2005), Korea (Lee and Kim 1992), Tarakan Waters (Prihatiningsih et al 2015;Laga et al 2017), Oman Sea (Parsa et al 2017), In Pangandaran Waters (Hikmawansyah et al 2019), in Paloh Waters in West Kalimantan (Damora et al 2018), the growth characteristics of pomfret fish in the Indonesian Sebatik Island are yet to be studied.…”

Section: Introductionmentioning

confidence: 99%

Growth, mortality and exploitation rate of Pampus argenteus, Parastromateus niger and Scomberomorus commerson in Sebatik Waters, Indonesia

Salim

Atieqah

Handayani³

et al. 2020

Biodiversitas

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Abstract. Salim G, Handayani KR, Indarjo A, Ransangan J, Atieqah N. 2020. Growth, mortality and exploitation rate of Pampus argenteus, Parastromateus niger and Scomberomorus commerson in Sebatik Waters, Indonesia. Biodiversitas 21: 5363-5372. The economic revenue of the local government of the Indonesian Sebatik Island relies much on the exploitation of its rich marine biodiversity. One of the important economic activities is the capture fisheries of commercially important fishes such as the white pomfret (Pampus argenteus) and black pomfret (Parastromateus niger), and mackerel fish (Scomberomorus commerson). The current study aims to estimate the growth, condition factor, and exploitation rate of the fish species for developing sustainable fishery management. Fish samplings were conducted in the Sebatik Waters, Nunukan District, North Kalimantan Province, Indonesia from June to July 2020. The fish were caught using gillnet at daytime (pomfrets) and nighttime (mackerel), respectively. Then, 82, 73, and 83 specimens of white pomfret, black pomfret, and mackerel were randomly selected for the length-weight relationship, condition factor, and exploitation rate analysis, respectively. The results revealed that the size distribution of the white pomfret population in the coastal waters of Sebatik Island ranged from 220.0 to 351.0 mm, black pomfret ranged from 231.0 to 362.0 mm and mackerel, ranged from 242.0 to 432.0 mm. All the fish species exhibited negative allometric (b<3) weight and length relationship with moderate to strong correlation. About 50% and 53.42% of the white pomfrets and black pomfrets were characterized by thin body shape. However, 49.40% of the mackerels were characterized by fat body shape. The asymptotic length (L∞) for white pomfrets was recorded at 359.133 mm; k value of 0.0427 mm/year with r-value of 0.9918 and the t0 value of 1.11/year. For black pomfret, the L∞ was estimated at 370.22 mm; k value of 0.043 mm/year with r-value at 0.9919 and the t0 value of 1.104/year. For mackerel, the L∞ value was estimated at 492.724 mm, k-value of 0.0246 mm/year with r-value of 0.9634, and the t0 value of 1.322/year. The total mortality, fishing mortality and natural mortality (Z, F, and N, respectively) and exploitation rate (E) for white fish were recorded at 113.76%, 80.58%, 33.18%, and 70.83%, respectively. For black pomfret, it recorded 113.15% (Z), 79.97% (F), 32.75% (N) and 70.67% (E). For mackerel, it recorded 109.87% (Z), 66.29% (F), 43.58% (N) and 60.33% (E). The high exploitation rate (>50%) and fishing mortality (>60%) of all the fish species analyzed in this study indicate that there is a sign of overfishing to these fish resources in the coastal waters of Sebatik island. Hence, sustainable fishing management is timely needed to prevent depletion of these important fishery resources. Such management can include fishing restrictions for small-sized and first mature fish, close fishing season, and strict requirement for fishing permits.

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Effects of shrimp trawlers on the fisheries status and environment of the Northwest Arabian Gulf

Cited by 7 publications

References 3 publications

Climatology and Changes in Temperature Seasonality in the Arabian Peninsula

Climatology and Changes in Temperature Seasonality in the Arabian Peninsula

Status of Commercial Fisheries in the Kingdom of Bahrain

Growth, mortality and exploitation rate of Pampus argenteus, Parastromateus niger and Scomberomorus commerson in Sebatik Waters, Indonesia

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