Complex small pelagic fish population patterns arising from individual behavioral responses to their environment

Brochier, Timothée; Auger, Pierre-Amaël; Pecquerie, Laure; Machu, Éric; Capet, Xavier; Thiaw, Modou; Mbaye, Baye Cheikh; Braham, Cheikh-Baye; Ettahiri, Omar; Charouki, Najib; Sène, Ousseynou Ndaw; Werner, Francisco E.; Brehmer, Patrice

doi:10.1016/j.pocean.2018.03.011

Cited by 44 publications

(43 citation statements)

References 76 publications

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“…The Mbodiè ne-Ngazobil, Port-Bay of Hann, Kafountine-Abé né and Yenne-Bargny sites were characterized by high concentrations of both juveniles and potential small pelagic spawners. These results are consistent with previous observations, which showed that small individuals are encountered in the southern zone from July to December (Freon, 1988;Brochier et al, 2018).…”

Section: Size Spectrumsupporting

confidence: 94%

“…These results are consistent with those of Sarré et al (2018), which showed that areas of high concentrations of adults of Sardinella were located south of Cape Verde and off Casamance. They also confirm the results obtained on the retention zones (Mbaye et al, 2015), of nursery (Brochier et al, 2018), spawning grounds (Tiedemann and Brehmer, 2017), and of high concentration of pelagic fish larvae (Ndour et al, 2018) along the coastal marine area of Senegal.…”

Section: Sexual Maturity Stagessupporting

confidence: 88%

“…These results are a refinement of earlier works conducted along the Senegalese continental shelf. Those works had identified the Petite Côte area (southern Cape Verde) and Casamance as nursery areas (Tiedemann and Brehmer, 2017;Brochier et al, 2018), and also an eggs and larvae retention area for small pelagics (Mbaye et al, 2015;Ndour et al, 2018). The effect of topographic features, such as capes and headlands modulates dramatically the onshore movement of upwelled water and favors the formation of stationary coastal upwelling centers (Faye et al, 2015;Capet et al, 2017).…”

Section: Size Spectrummentioning

confidence: 99%

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Identification and Characterization of Critical Sites for Small Pelagic Fish in the Coastal Marine Area of Senegal, West Africa

Ndour

Assiatou²,

Thiam³

et al. 2019

JBLS

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Better management of coastal marine resources generally requires good knowledge of habitats and resources. This need led to the performance of an identification and bioecological characterization study of critical sites for small pelagics in the Senegalese coastal marine zone. Biological and ecological data were collected using beach seines (12 to 28 mm mesh) and surface drifting gillnets (28 to 36 mm mesh) at sites identified by fishermen on the basis of surveys. The results of the study highlight the bioecological characteristics of these sites: (i) the Port-Baie Hann site - a nursery and spawning site with a high diversity for the target species; it is under marine pollution threat; (ii) the Mbodiène-Ngazobil site, with high diversity for target species and the Kafountine-Cap site are nursery and spawning sites under high fishing pressure, (iii) the Diakhanor-Sangomar site - a spawning site under the potential threat of exploration of offshore Sangomar oil in addition to the high fishing pressure. This work is a first flagship contribution to a process that should lead to the development and control of new tools for the effective and sustainable management of small pelagics at national and regional scales.

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Section: Size Spectrumsupporting

confidence: 94%

Section: Sexual Maturity Stagessupporting

confidence: 88%

Section: Size Spectrummentioning

confidence: 99%

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Identification and Characterization of Critical Sites for Small Pelagic Fish in the Coastal Marine Area of Senegal, West Africa

Ndour

Assiatou²,

Thiam³

et al. 2019

JBLS

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“…Besarnya deviasi upaya penangkapan pada Februari dan Juni 2018 terhadap rerata upaya dengan kisaran 378-790 trip/bulan maka besarnya indeks kelimpahan sumberdaya ikan tertinggi (0,19 ton/trip/bulan) terjadi pada Oktober dan November 2018 dengan upaya penangkapan masingmasing yaitu 527 trip dan 511 trip atau rata-rata sekitar 8,2% dari total upaya penangkapan 1 (satu) tahun dengan kontribusi hasil tangkapan sebesar 13,5% dari total hasil tangkapan 1 (satu) tahun, sedangkan besarnya indeks kelimpahan sumberdaya ikan terendah (0,07 ton/trip/bulan) terjadi pada Agustus dengan upaya penangkapan sebesar 466 trip atau sekitar 7,4% dari total upaya penangkapan 1 (satu) tahun dengan kontribusi hasil tangkapan sebesar 4,8% dari total hasil tangkapan 1 (satu) tahun. Fluktuasi tersebut berkaitan dengan parameter yang cukup komplek terutama terkait dengan pola jenis ikan saat merespon perubahan lingkungannya (Brochier et al, 2018). Fenomena puncak musim juga berbeda menurut kawasannya (Irnawati et al, 2018) mengemukakan bahwa msuim penangkapan ikan teri berbeda antara perairan pantai Utara Jawa dan Selat Sunda terjadi padaApril sedangkanAgustus di Selatan pulau Jawa.…”

Section: -267unclassified

Dinamika Perikanan Payang Di Perairan Utara Karawang Dan Sekitarnya

Akbar¹,

Patria

2019

JURNAL PENELITIAN PERIKANAN INDONESIA

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ABSTRAKPerikanan skala kecil terutama perikanan payang merupakan salah satu tulang punggung mata pencaharian masyarakat pesisir di perairan Karawang, Jawa Barat. Peran nyata aktivitas perikanan pada keanekaragaman sumberdaya hayati laut adalah memanfaatkan sumberdaya hayati perairan laut di kawasan pesisir dengan kondisi kelimpahan sumberdaya ikan yang cenderung berfluktuasi pada tingkat yang relatif rendah. Penelitian dilakukan melalui survey lapang pada kurun waktu Agustus -Nopember 2018 dengan basis data hasil tangkapan dan upaya penangkapan pada rentang waktu 2016-2018. Beberapa data lingkungan terkait ragam keadaan cuaca yang digambarkan oleh data curah hujan, arah dan kecepatan angin digunakan untuk menggambarkan siklus adaptasi nelayan untuk mempertahankan mata pencariannya. Aktivitas penangkapan menggunakan perahu dengan tonase <10 GT dan rerata kekuatan mesin sekitar 20 PK, beroperasi dalam skala harian dengan alat penangkapan ikan utama adalah jaring payang. Perkembangan tahunan indeks kelimpahan sumberdaya ikan dengan alat tangkap payang pada kurun waktu 2004-2008 dan 2015-2018 cenderung menurun. Tahun 2004 nilai indeks kelimpahan sumberdaya ikan sebesar 268 kg/trip menjadi 199 kg/trip pada 2008 dan terus menipis menjadi sebesar 115 kg/trip tahun 2018. Hal ini mengindikasikan usaha perikanan cenderung berada pada kondisi tidak berkelanjutan bila tidak dilakukan pengelolaan. Keberlanjutan usaha perikanan masih dapat diharapkan jika dilakukan perubahan terhadap sistem usaha yang lebih bersifat menjadi gabungan individu perahu yang berukuran kecil menjadi usaha kelompok dengan perahu yang berukuran lebih besar diatas 10 GT dengan daerah penangkapan yang lebih jauh. ABSTRACTOne day pelagic seine (payang) fisheries, is one of the backbones of coastal community livelihoods in North Karawang waters, West Java. The significant role of fisheries activities to harvest small pelagic fish resource in coastal areas indicated that the monthly CPUE tend fluctuated and stabil at low level. The study was conducted through a field survey in the period August -November 2018 with a database of catches and efforts from 2016-2018. Some environmental data related to various weather conditions illustrated by rainfall data, wind direction and speed are used to describe the adaptation cycle of fishermen to maintain their livelihoods. Fishing activities using boat with tonnage <10 GT and average engine strength of around 20 PK, operating on a daily scale with the main fishing gear is payang net. The average annual catch per trip (CPUE) of payang fisheries within period of 2004-2008 to 2015 tend to decrease. In 2004 the CPUE was 268 kg/trip then 2008 to lower index in 2018 of 115 kg / trip. This indicates that the fishery business is suspected to be in an unsustainable condition if no sustainable management is carried out. Sustainability of the fisheries business can still be expected if changes are made to

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“…Recent studies combining observations and numerical simulations have suggested that the topographical features and subtleties in the wind spatial/temporal structure have a major impact on upwelling water pathways and overall dynamical, hydrological, biogeochemical, and ecological (Capet et al, 2017;Pitcher et al, 2010;Ndoye et al, 2017;Messié and Chavez, 2015;Zhang et al, 2015;Brochier et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

A numerical modeling study of the Southern Senegal upwelling shelf: Circulation and upwelling source waters

Ndoye¹,

Capet²,

Estrade³

et al. 2018

Afr. J. Environ. Sci. Technol.

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The regional ocean circulation along the Southern Senegal shelf is studied using a numerical model for varying forcing fields during the upwelling season (November-May). The main objective is to study the shelf circulation of the marine environment in the Southern Senegal Upwelling Shelf (SSUS), the Lagrangian pathways by which waters are transported to the surface in the upwelling tongue and the fate of these waters. Model results are compared with hydrographic measurements during UPSEN2-ECOAO survey and satellite images datasets. The upwelling source waters and also the warm nearshore waters are analyzed, from a Lagrangian point of view, by computing the paths of particles that are passively advected by the regional ocean model velocity field (ROMS). It was found that the model is capable of representing the main characteristics of the SSUS whose Sea Surface Temperature (SST) patterns and their variability have an important similarities but the assessment of the current simulated by the model is less obvious because of the few available observations. The present results suggest that high frequency of wind has a strong influence over the mesoscale patterns of the crossshore circulation in association with local topography and the presence of the Cape Verde peninsula. These cross-shore circulations are dominated by an onshore flow around 14.5°N and an offshore flow around 14.1°N. The onshore flow is in agreement with the previous eulerian studies regarding the coastal divergence of the surface flow (upwelling) that was strongly localized within a few tens of kilometers south of the Cape Verde in the Hann Bight. Lagrangian experiments show also very clearly that coastal warm waters are upwelling waters that were advected from Hann Bight and underwent a strong warming by the heat flux from the atmosphere to the ocean in a shallow area (∼10 m); therefore, easy to warm up. All numerical solutions have shown a tendency of upwelling particles remaining on the shelf for more than a month. These results may explain the enrichment of water in the SSUS and suggest the need to consider the whole shelf as a retention area.

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Complex small pelagic fish population patterns arising from individual behavioral responses to their environment

Cited by 44 publications

References 76 publications

Identification and Characterization of Critical Sites for Small Pelagic Fish in the Coastal Marine Area of Senegal, West Africa

Identification and Characterization of Critical Sites for Small Pelagic Fish in the Coastal Marine Area of Senegal, West Africa

Dinamika Perikanan Payang Di Perairan Utara Karawang Dan Sekitarnya

A numerical modeling study of the Southern Senegal upwelling shelf: Circulation and upwelling source waters

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