كبلين

(تم التحويل من Capelin)
هذا المقال هو عن the fish. إذا كنت تريد the plant genus، انظر Mallotus (plant).

Capelin
Mallotus villosus.gif
التصنيف العلمي edit
أصنوفة غير معروفة (أصلحها): Mallotus
Species:
Template:Taxonomy/MallotusM. villosus
Binomial name
Template:Taxonomy/MallotusMallotus villosus

الكبلين Capelin سمكة مياه مالحة صغيرة، من فصيلة الهف، فضية اللون، تعيش في البحار الباردة المحيطة بالقطب الشمالي، وهي من أسماك الطعام المحبوبة.

كبلين على عملة آيسلندية.

تسبح العديد من أسماك الكبلين في كل عام، خلال الشهور الأكثر دفئًا، إلى الشواطئ الحصوية، حيث تضع الإناث البيض، ويخصب الذكور البيض بإفراز سوائلهم المنوية عليه. وتجرف الأمواج أسماك الكبلين وتعيدها إلى البحر، ويموت معظمها بعد وضع البيض. يلتصق البيض بالحصى وتقوم الأمواج بدفنه. ويفقس البيض بعد انقضاء فترة تتراوح بين أسبوعين وأربعة أسابيع. وتغادر الأسماك الحديثة الفقس الحصى، عندما تغمر المياه الدافئة الشاطئ مدفوعة بقوة الرياح. وتتغذى أسماك الكبلين الصغيرة بالحيوانات المجهرية المعروفة باسم العوالق الحيوانية. ويكتمل نموها بصورة تجعلها قادرة على التوالد بعد حوالي سنتين، وتنمو لتصل إلى حجمها الكامل البالغ نحو 20سم بعد نحو ثلاث سنوات.

توفر أسماك الكبلين الطعام للفقمات، والحيتان، والعديد من أنواع الأسماك والطيور. يأكل الناس أسماك الكبلين، ويستخدمونها لإعداد وجبات الأسماك وصنع الزيت.

هجرة الكبلين

هذه هي المذبحة الأكثر وحشية في تاريخ المحيط.
Distribution and migration of Icelandic capelin

Green shade: Feeding area of adults
Blue shade: Distribution of juveniles
Green arrows: Feeding migrations
Blue arrows: Return migrations
Red shade and Red arrows: Spawning migrations – Main spawning grounds and larval drift routes
Atlantic puffin with capelin in its mouth

Capelin populations in the Barents Sea and around Iceland perform extensive seasonal migrations. Barents Sea capelin migrate during winter and early spring to the coast of northern Norway (Finnmark) and the Kola Peninsula (Russia) for spawning. During summer and autumn, capelin migrate north- and north-eastward for feeding.[1]

Icelandic capelin move inshore in large schools to spawn and migrate in spring and summer to feed in the plankton-rich oceanic area between Iceland, Greenland, and Jan Mayen. Capelin distribution and migration is linked with ocean currents and water masses. Around Iceland, maturing capelin usually undertake extensive northward feeding migrations in spring and summer, and the return migration takes place in September to November. The spawning migration starts from north of Iceland in December to January. In 2009, researchers from Iceland made an interacting particle model of the capelin stock around Iceland, successfully predicting the spawning migration route for the previous year.[2]

التكاثر

As an r-selected species, capelin have a high reproductive potential and an intrinsic population growth rate.[3] They reproduce by spawning and their main spawning season occurs in spring but can extend into the summer. The majority of capelin are three or four years old when they spawn.[1] The males migrate directly to the shallow water of fjords, where spawning will take place, while the females remain in deeper water until they are completely mature. Once the females are mature, they migrate to the spawning grounds and spawn.[4] This process usually takes place at night.[1] In the North European Atlantic spawning typically occurs over sand or gravel at depths of 2 to 100 m (7–328 ft),[5] but in the North Pacific and waters off Newfoundland most spawn on beaches, jumping as far up land as possible, with some managing to strand themselves in the process.[3][6] Although some other fish species leave their eggs in locations that dry out (a few, such as plainfin midshipman, may even remain on land with the eggs during low tide) or on plants above the water (splash tetras), jumping onto land en masse to spawn is unique to the capelin, grunions, and grass puffer.[7][8] In beach-spawning capelin populations, after the female capelins have spawned, they immediately leave the spawning grounds and can spawn again in the following years if they survive. The males do not leave the spawning grounds and potentially spawn more than once throughout the season.[4] Beach-spawning male capelin are considered to be semelparous because they die soon after the spawning season is over.[1] In ocean spawning capelin populations, it has been observed that both male and female capelin are semelparous and die after spawning.[9] This difference observed between capelin populations shows that capelin are physiologically capable of an iteroparous or semelparous reproductive mode depending on spawning habitat.[9]

Studies on two populations of Newfoundland capelin which spawn in two distinct habitats found a lack of evidence of genetic variability between beach and deep-water spawners.[10] This provides support for the species being facultative spawners. Capelin may select optimal spawning location based on abiotic factors such as temperature range and sediment.[11] The optimal temperature range for capelin eggs that leads to greatest hatching success and offspring quality appears when eggs are incubated between 5 و 10 °C (41 و 50 °F).[11] This optimal temperature range provides support that individual capelin are able to select spawning location based on temperature, as temperature is one of the most variable factors between beach and deep-water spawning habitats for capelin.[11] There is also evidence that shows that temperature is not the only factor at play when it comes to selection of spawning habitat. When both habitats are simultaneously experiencing temperatures in the optimal range, capelin are found to spawn in both habitats.[10] This may be an advantageous strategy that leads to increased fitness.[10] Capelin have been observed to spawn at beaches when deep-water or subtidal habitat is lower than 2 °C (36 °F) and spawn in deep-water habitats when beach habitats temperature is consistently above 12 °C (54 °F).[11]

المأكل

Capelin are planktivorous fishes that forage in the pelagic zone.[12] Studies analyzing diet in populations of capelin in both the arctic marine environment as well as in west Greenland waters show that their diet consists upon primarily euphausiids, amphipods, and copepods.[13][12] As capelin individuals grow, the composition of their diet changes.[13] Smaller capelin primarily consume smaller prey (copepods) and shift their diet towards feeding on primarily larger euphausiids and amphipods as body and gape size increases.[13][12] The sufficient distribution and abundance of these zooplankton is necessary for capelin to meet energy requirements for progressing through many stages of their life cycle.[12] Capelin occupy a similar dietary niche as polar cod, which leads to a potential for interspecific competition between the two species.[12]

مصايد

Global capture production of Capelin (Mallotus villosus) in million tonnes from 1950 to 2022, as reported by the FAO[14]

Capelin is an important forage fish, and is essential as the key food of the Atlantic cod. The northeast Atlantic cod and capelin fisheries, therefore, are managed by a multispecies approach developed by the main resource owners Norway and Russia.

In some years with large quantities of Atlantic herring in the Barents Sea, capelin seem to be heavily affected. Probably both food competition and herring feeding on capelin larvae lead to collapses in the capelin stock. In some years, though good recruitment of capelin despite a high herring biomass suggests that herring are only one factor influencing capelin dynamics.

In the provinces of Quebec (particularly in the Gaspé peninsula) and Newfoundland and Labrador in Canada, it is a regular summertime practice for locals to go to the beach and scoop the capelin up in nets or whatever is available, as the capelin "roll in" in the millions each year at the end of May or in early June.[15]

Commercially, capelin is used for fish meal and oil industry products, but is also appreciated as food. The flesh is agreeable in flavour, resembling herring. Capelin roe (masago) is considered a high-value product in Japan. It is also sometimes mixed with wasabi or green food colouring and wasabi flavour and sold as "wasabi caviar". Often, masago is commercialised as ebiko and used as a substitute for tobiko, flying fish roe,[16] owing to its similar appearance and taste, although the mouthfeel is different due to the individual eggs being smaller and less crunchy than tobiko.


المصادر

الموسوعة المعرفية الشاملة

  1. ^ أ ب ت ث Gjøsæter, H. (1998). "The population biology and exploitation of capelin (Mallotus villosus) in the Barents Sea". Sarsia. 83 (6): 453–496. doi:10.1080/00364827.1998.10420445.
  2. ^ Barbaro, A.; Einarsson, B.; Birnir, B.; Sigurthsson, S.; Valdimarsson, H.; Palsson, O. K.; Sveinbjornsson, S.; Sigurthsson, T. (2009). "Modelling and simulations of the migration of pelagic fish". ICES Journal of Marine Science. 66 (5): 826. doi:10.1093/icesjms/fsp067.
  3. ^ أ ب Rose, G.A. (2005). "Capelin (Mallotus villosus) distribution and climate: a sea 'canary' for marine ecosystem change". ICES Journal of Marine Science. 62 (7): 1524–1530. doi:10.1016/j.icesjms.2005.05.008.
  4. ^ أ ب Friis-Rødel, E. (2002). "A review of capelin (Mallotus villosus) in Greenland waters". ICES Journal of Marine Science. 59 (5): 890–896. Bibcode:2002ICJMS..59..890F. doi:10.1006/jmsc.2002.1242.
  5. ^ Muus, B., J. G. Nielsen, P. Dahlstrom and B. Nystrom (1999). Sea Fish. pp. 98–99. ISBN 8790787005
  6. ^ Polar Life Canada: Capelin, Mallotus villosus. Retrieved 20 August 2016.
  7. ^ Roland, T. (9 April 2010). Running with the Grunion. The Independent. Retrieved 20 August 2016.
  8. ^ Martin, K.L.M. (2014). Beach-Spawning Fishes: Reproduction in an Endangered Ecosystem. CRC Press. ISBN 978-1482207972.
  9. ^ أ ب Christiansen, Jørgen S.; Præbel, Kim; Siikavuopio, Sten I.; Carscadden, James E. (28 May 2008). "Facultative semelparity in capelin Mallotus villosus (Osmeridae)-an experimental test of a life history phenomenon in a sub-arctic fish". Journal of Experimental Marine Biology and Ecology (in الإنجليزية). 360 (1): 47–55. Bibcode:2008JEMBE.360...47C. doi:10.1016/j.jembe.2008.04.003.
  10. ^ أ ب ت Penton, Paulette M.; McFarlane, Craig T.; Spice, Erin K.; Docker, Margaret F.; Davoren, Gail K. (5 November 2014). "Lack of genetic divergence in capelin ( Mallotus villosus ) spawning at beach versus subtidal habitats in coastal embayments of Newfoundland". Canadian Journal of Zoology (in الإنجليزية). 92 (5): 377–382. Bibcode:2014CaJZ...92..377P. doi:10.1139/cjz-2013-0261. ISSN 0008-4301.
  11. ^ أ ب ت ث Crook, Kevin A.; Maxner, Emily; Davoren, Gail K. (2017-07-01). Robert, Dominique (ed.). "Temperature-based spawning habitat selection by capelin (Mallotus villosus) in Newfoundland". ICES Journal of Marine Science (in الإنجليزية). 74 (6): 1622–1629. doi:10.1093/icesjms/fsx023. ISSN 1054-3139.
  12. ^ أ ب ت ث ج McNicholl, D. G.; Walkusz, W.; Davoren, G. K.; Majewski, A. R.; Reist, J. D. (27 November 2015). "Dietary characteristics of co-occurring polar cod (Boreogadus saida) and capelin (Mallotus villosus) in the Canadian Arctic, Darnley Bay". Polar Biology (in الإنجليزية). 39 (6): 1099–1108. doi:10.1007/s00300-015-1834-5. hdl:1993/31778. ISSN 0722-4060.
  13. ^ أ ب ت Hedeholm, R.; Grønkjær, P.; Rysgaard, S. (24 June 2012). "Feeding ecology of capelin (Mallotus villosus Müller) in West Greenland waters". Polar Biology (in الإنجليزية). 35 (10): 1533–1543. Bibcode:2012PoBio..35.1533H. doi:10.1007/s00300-012-1193-4. ISSN 0722-4060.
  14. ^ "Fisheries and Aquaculture - Global Production". Food and Agriculture Organization of the United Nations (FAO). Retrieved 2024-05-06.
  15. ^ "They're Back: Capelin are Rolling at Middle Cove Beach". Canadian Broadcasting Corporation. Retrieved 9 July 2015.
  16. ^ "'Tobiko' & 'Ebiko'". Archived from the original on 5 February 2017. Retrieved 5 February 2017.

المراجع

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