Stock assessment of the alien species Brushtooth lizard fish, Saurida undosquamis (Richardson, 1848) in the Egyptian Mediterranean coast

Mahmoud, Hatem H.; El-Haweet, Alaa Eldin; Dimech, Mark

doi:10.1016/j.ejar.2014.12.003

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…The total length of the collected white shrimp Metapenaeus, stebbingi samples ranged from 4.6 -10.2 cm and their weights varied from 0.26 to 6.6 g. Mehanna and Khalifa (2007) recorded the total length of the same species from the south-eastern Mediterranean Sea (Port Said region) varied between 3.1 and 11.3 cm. While, Mahmoud et al (2016) recorded the size of M. stebbingi ranged between 7 and 42 mm in the catch of Egyptian Mediterranean. The relationship between the total length and total weight of M. stebbingi was shown n Fgure (2) and its equation was: 𝑊 = 0.0067𝐿 3.0147 The length-weight relationship has vital importance in fisheries science.…”

Section: Resultsmentioning

confidence: 98%

Growth, mortality and sustainable exploitation of white shrimp (Metapenaeus stebbingi) in Bardawil lagoon of Egypt

Attoan,

El-Aiatt,

Ahmed

2024

Journal of Egyptian Academic Society for Environmental Developm

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Samples of the white shrimp, Metapenaeus, stebbingi, were collected from fish landings at Bardawil lagoon. Their length ranged from 4.6 -10.2 cm. The estimated von Betalanffy growth parameters TL∞ and K of combined sex 10.8 cm and K = 0.7 y -1 , respectively. The values of the mortality rates (Z, M and F) and exploitation ratio computed using FiSAT-II software were 2.57y -1 , 1.05 y -1 , 1.52 y -1 and 0.59, respectively. The maximum economic yield (at E 10 ) was 0.607g, the exploitation level that maintains the biomass at 50% of fished (E 50 ) was 0.358. From the results it was concluded that proper management of the stock of M. stebbingi in Bardawil lagoon can be achieved by decreasing the current the exploitation rate (0.59) to 0.358 to maintain a sufficient spawning biomass through reducing the fishing effort or the number of fishing days or the number of fishing trips besides applying the closing fishing season for a suitable period.

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Section: Resultsmentioning

confidence: 98%

Growth, mortality and sustainable exploitation of white shrimp (Metapenaeus stebbingi) in Bardawil lagoon of Egypt

Attoan,

El-Aiatt,

Ahmed

2024

Journal of Egyptian Academic Society for Environmental Developm

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“…The Egyptian landings from both the Mediterranean and Red Sea have shown a decline in the last two decades (Figure 3). Most of the stock assessments conducted in the last few years showed that many species in Egyptian fisheries are subject to overfishing, including sea bream Sparus aurata, Egyptian sole Solea aegyptiaca, striped red mullet Mullus surmuletus, cuttlefish Sepia officinalis, round sardinella aurita, brushtooth lizard fish Saurida undosquamis, puffer fish Lagocephalus sceleratus, rabbitfish Siganus rivulatus and two-barred seabream Acanthopagrus Bifasciatus [38][39][40][41][42][43][44][45][46]. Most of these assessments have recommended a reduction in fishing mortality through the adoption of adequate management measures [47].…”

Section: Discussionmentioning

confidence: 99%

Insights on Illegal, Unreported and Unregulated (IUU) Fishing Activities by Egyptian Vessels in Neighbouring Countries

Samy-Kamal

2022

Fishes

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Illegal, unreported and unregulated (IUU) fishing is recognised as one of the largest threats to the sustainability of the world’s fisheries. The fight against IUU fishing activities has recently become a high priority in the international fisheries management agenda. While a number of academic contributions have sought to improve the understanding of the problem, data are still limited, especially in developing countries. In the absence of any information in this regard in Egypt, this contribution is the first attempt to report the available information about cases of Egyptian fishing vessels detained for fishing illegally in neighbouring countries, including the Mediterranean and Red Seas. The highest number of cases was observed in 2015 (7 cases) followed by 2010, 2013, 2016 and 2020 (each with 5 cases). The highest number of detained vessels by far was observed in 2020 (44 vessels) followed by 2015 (19 vessels). Tunisia was the country with the highest number of cases (17 cases) followed by Libya (10 cases), while Somalia detained the highest number of vessels (42 vessels) followed by Libya (22 vessels). The results shed light on the problems that led to this situation, starting with depleted fisheries, a poor monitoring system and a difficult economic situation in the fishing sector.

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“…The growth performance index reported for S. undosquamis from other tropical regions varied from 2.65 to 5.29 (Kadharsha et al, 2014), and the value of 2.96 obtained in the present study lies well within this range. Mahmoud et al (2014) reported a growth performance index of 2.61 from Mediterranean coast of Egypt. However, the values reported from Bay of Bengal by Rajkumar et al (2003) and by Kadharsha et al (2014) were 3.61 and 4.9, respectively, which are higher estimates compared to that reported in the present study.…”

Section: Growth Parametersmentioning

confidence: 99%

“…Nearly 45% of the lizardfish landings of eastern Arabian Sea comprised of S. undosquamis, which are landed either as juveniles or adults and fetches reasonable price in the local market. Though some aspects of the biology of this species have been studied and reported from the southeastern Arabian Sea (Sivakami, 1999;Nansimole et al, 2014), knowledge on the stock dynamics and recruitment pattern of S. undosquamis is scarce except that of the limited reports available from other tropical maritime regions (Ingles and Pauly, 1984;Rajkumar et al, 2003;Cicek and Avsar, 2011;Metar et al, 2011;Wang et al, 2012;Mahmoud et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Stock dynamics of the brushtooth lizardfishSaurida undosquamis(Richardson, 1848) from a tropical multispecies fishery in the southeastern Arabian Sea

Najmudeen

Seetha

Zacharia

2019

Aquat. Living Resour.

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The brushtooth lizardfish Saurida undosquamis (Richardson, 1848) is a high trophic level benthic predator and is one among the most exploited demersal finfish species from eastern Arabian Sea by Indian trawlers. However, in recent years, the landings of many top predator fishes including S. undosquamis showed a declining trend resulting in a steady decline in the mean trophic levels of the fishes caught commercially in the region. We investigated the growth, mortality and stock dynamics of S. undosquamis harvested by mechanised trawls in the southeastern Arabian Sea, using length-based methods for the data collected during 2012–2016. Besides, Bayesian state-space implementation of the Schaefer model (BSM) and catch-based MSY (CMSY) estimation were also made using the data for the period 1985–2016. Total length of the fish ranged from 5.5 to 34.5 cm with average annual mean length of 22.0 cm during 2012–2016. The growth parameters L∞ and K were 37.3 cm and 0.41 year−1, respectively. The natural, fishing and total mortality coefficients were 0.92, 2.58 and 3.5, respectively and exploitation ratio was 0.82. The length at first maturity was estimated at 21.4 cm for females. The mean size in the catch is lower than the optimum length for exploitation. Fisheries reference points (MSY, Fmsy, Bmsy) as well as relative stock size (B/Bmsy) and exploitation (F/Fmsy) estimated from catch data and broad priors for resilience (r), implies an exploitation of 30% below Bmsy level. Results from the length-based Thompson and Bell prediction model indicates that reducing the present level of fishing effort by 40% would lead to a harvest of the species at a sustainable level. As “fishing down food web” is reported in recent years from eastern Arabian Sea, the exploitation of top predators need to be maintained at sustainable levels to prevent ecosystem changes along the region.

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Stock assessment of the alien species Brushtooth lizard fish, Saurida undosquamis (Richardson, 1848) in the Egyptian Mediterranean coast

Cited by 10 publications

References 16 publications

Growth, mortality and sustainable exploitation of white shrimp (Metapenaeus stebbingi) in Bardawil lagoon of Egypt

Growth, mortality and sustainable exploitation of white shrimp (Metapenaeus stebbingi) in Bardawil lagoon of Egypt

Insights on Illegal, Unreported and Unregulated (IUU) Fishing Activities by Egyptian Vessels in Neighbouring Countries

Stock dynamics of the brushtooth lizardfishSaurida undosquamis(Richardson, 1848) from a tropical multispecies fishery in the southeastern Arabian Sea

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