Reproductive Biology of Sardinella sp. (Sardinella aurita and Sardinella maderensis) in the South of Morocco

Baali, Ayoub; Bourassi, Hajar; Falah, Samira; Abderrazik, Wahbi; Manchih, Khalid; Amenzoui, Khadija; Yahyaoui, Ahmed

doi:10.3923/pjbs.2017.165.178

Cited by 6 publications

(17 citation statements)

References 12 publications

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“…The lengths at first maturity (LFMs) estimated in the present study (∼24 cm TL) are similar to results obtained by other authors for the Mauritanian round sardinella (ter Hofstede et al, 2007; Ndiaye et al, 2018). The species reaches its maturity at bigger sizes both in NW Africa (including South Morocco) (Baali et al, 2015(Baali et al, , 2017Amenzoui & Baali, 2018), compared with the LFM estimated southwards (Castro et al, 2017), and also in the Mediterranean Sea (Tsikliras & Antonopoulou, 2006) and in SW Atlantic waters (Gassman et al, 2008;Tagliafico et al, 2008), probably due to the influence of the powerful upwelling in the area. This process could increase the growth rate, leading to the achievement of greater sizes than in other less resource-rich areas, at the same ontogenetic state.…”

Section: Discussionsupporting

confidence: 91%

“…Nevertheless, a significant unbalanced sex-ratio has been described in the Mediterranean Sea (Navarro, 1932; Dahel et al ., 2016) and in the SW Atlantic (Gassman et al ., 2008; Tagliafico et al ., 2008). Regarding the sex-ratio variation according to the length, the predominance of females in the smallest and the biggest sizes, as well as a balance for the middle length classes in the range, had been observed both for Atlantic (Wagué & M'Bodj, 2002; Baali et al ., 2017; Amenzoui & Baali, 2018) and Mediterranean stocks (Tsikliras & Antonopoulou, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…(2019 b ) found the same results in Senegalese waters, where these cycles match with the upwelling intensity and the SST changes. Conversely, slight differences in the duration and seasonal changes of these cycles have been described in Moroccan waters (Baali et al ., 2017), which is probably due not only to environmental influence and food availability (Roy et al ., 1989), but also to the latitudinal migration of the stock along the NW African coast (Boëly et al ., 1982a; Garcia, 1982).…”

Section: Discussionmentioning

confidence: 99%

“…This could be due to the influence of the NW African upwelling system, which promotes really high productive periods when food availability drastically increases (Barton et al ., 1998; Baldé et al ., 2019 b ). In fact, most of the species landed in Morocco correspond to fisheries around Dakhla, under the influence of this system (Baali et al ., 2017; Amenzoui & Baali, 2018). Although they did not result in statistical significance for the Mauritanian round sardinella, differences in the growth parameters between sexes have been described for populations from Morocco (Baali et al ., 2015) and from the Mediterranean Sea (Navarro, 1932; Dahel et al ., 2016).…”

Section: Discussionmentioning

confidence: 99%

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Life history parameters of the round sardinella Sardinella aurita in the Central East Atlantic off north-west Africa

et al. 2020

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Sardinella aurita has become an important source of fish protein-intake in NW African countries, where one stock is considered from Morocco to south Senegal, performing seasonal reproductive migrations along the coast. Although data are limited for the fisheries involved and for life-history knowledge of the species in the area, a precautionary approach is recommended to avoid overexploitation. Commercial landings of round sardinella produced by the European freezer-pelagic trawlers operating in Mauritanian waters were analysed between May 2004 and February 2012. The length-weight relationships (LWRs) (N = 40,725) did not show significant differences between sexes. Ripening round sardinellas were present throughout the year, but spawning effort rose between June and December. The length at first maturity for males and females was estimated at 27.7 cm TL (2.1 years) and 28.1 cm TL (2.2 years), respectively. Ages were interpreted from otoliths, varying from 0 to 8 years. Von Bertalanffy growth parameters resulted in non-statistically significant differences between sexes (P = 0.28). Natural mortality was estimated at ~0.63 year–1. The results provide important biological information for fisheries assessment of a species that plays an important key role in the current climate change scenario and for the economies of the riparian countries.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Life history parameters of the round sardinella Sardinella aurita in the Central East Atlantic off north-west Africa

et al. 2020

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“…The Sardinella spp. represent the second pelagic species caught in this area after the sardine (Sardina pilchardus Walbaum, 1792), where Sardinella aurita represents the most dominant species (Baali et al, 2017).…”

Section: Diet Feeding Ecology Crustacean Atlantic Coastmentioning

confidence: 99%

Diet composition of round sardinella (Sardinella aurita) and flat sardinella (Sardinella maderensis) in the south of Atlantic Moroccan coast

Baali¹,

Ouazzani²,

Touhami³

et al. 2020

Egypt. J. of Aquatic Biolo. and Fish.

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The biological interactions between species are not limited only to trophic relationships; parasitism and diseases also occur. However, predator-prey relationships have a dominant role. In fact, natural mortality can vary considerably with predation, famine, and disease, but predation seems to be the dominant factor (Daan, 1989). Studies on diet composition are crucial in community ecology considering that the use of resources by organisms has a major influence among population interactions within a community (Mequilla and Campos, 2007). Analysis of stomach contents could provide helpful information concerning the position of the fishes in the food web of their environment and estimation of trophic levels (Pauly and Christensen, 2000; Post et al., 2000). In addition, the quality and quantity of food are among primordial factors that ARTICLE INFO

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Reproductive Dynamics of Three Important Clupeiform Food Fishes in the Min River Estuary and Its Adjacent Nearshore Waters, China

et al. 2021

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Reproductive dynamics of three important clupeiform food fishes (Gray's Grenadier Anchovy Coilia grayii, Osbeck's Grenadier Anchovy Coilia mystus, and Chinese Gizzard Shad Clupanodon thrissa) were studied in the largest estuary of Fujian Province, China: the Min River estuary and its adjacent nearshore waters. Samples were collected from May 2017 through July 2020 using trammel nets and trawlers. Females were observed to be significantly larger than males for Gray's and Osbeck's grenadier anchovies but not for Chinese Gizzard Shad. The overall sex ratios of all three species showed a significant female bias. Gonad histology was applied to determine spawning season, peak spawning season, and length at 50% maturity for females and males. The spawning season of females lasted from April to September (peak spawning season in April-July) for Gray's Grenadier Anchovy, from March to September (peak in March-June) for Osbeck's Grenadier Anchovy, and from April to July (peak in May-July) for Chinese Gizzard Shad. Spawning seasons of males were similar to those of females. The estimated SLs at 50% maturity for females and males, respectively, were 11.3 and 9.4 cm for Gray's Grenadier Anchovy, 12.7 and 10.4 cm for Osbeck's Grenadier Anchovy, and 12.7 and 11.6 cm for Chinese Gizzard Shad. The spawning grounds for these species were located for the first time: in the Min River estuary for Gray's Grenadier Anchovy, mainly in the adjacent nearshore waters and extending to the estuary for Osbeck's Grenadier Anchovy, and mainly in the lower reaches of the Min River and extending to the estuary for Chinese Gizzard Shad. As important food fishes in the region, stocks of these three species have shown certain degrees of overexploitation; therefore, stock assessments and management plans are necessary to achieve their sustainable fisheries.

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Reproductive Biology of Sardinella sp. (Sardinella aurita and Sardinella maderensis) in the South of Morocco

Cited by 6 publications

References 12 publications

Life history parameters of the round sardinella Sardinella aurita in the Central East Atlantic off north-west Africa

Life history parameters of the round sardinella Sardinella aurita in the Central East Atlantic off north-west Africa

Diet composition of round sardinella (Sardinella aurita) and flat sardinella (Sardinella maderensis) in the south of Atlantic Moroccan coast

Reproductive Dynamics of Three Important Clupeiform Food Fishes in the Min River Estuary and Its Adjacent Nearshore Waters, China

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