Short-Distance Spawning Migration of Tropical Freshwater Eels

Aoyama, Jun; Wouthuyzen, Sam; Miller, Michael J.; Inagaki, Tadashi; Tsukamoto, Katsumi

doi:10.2307/1543500

Cited by 98 publications

(110 citation statements)

References 11 publications

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“…Japanese scientists then discovered the spawning area of A. japonica in 1991 (Tsukamoto 1992) after smaller and smaller larvae were collected farther offshore . These surveys expanded out across the Indo-Pacific (Aoyama et al 2003(Aoyama et al , 2007Kuroki et al 2006) with evidence of offshore spawning by eels in the western South Pacific being found (Kuroki et al 2008;Aoyama 2009) and local spawning by eels in the Indonesian seas being discovered (Aoyama et al 2003). These collections and genetic or morphological information about anguillid population structures (Minegishi et al 2008;Watanabe et al 2008Watanabe et al , 2011 and silver eel tagging studies (Schabetsberger et al 2015;Jellyman and Tsukamoto 2010) led to ideas about the locations of Indo-Pacific anguillid spawning areas ( Fig.…”

Section: Distribution and Dispersal Of Anguillid Larvaementioning

confidence: 99%

“…There is evidence that some species in the western South Pacific make long migrations (Kuroki et al 2008;Jellyman and Tsukamoto 2010), but also that some tropical anguillids in the central Indonesian Seas spawn after much shorter migrations (Aoyama et al 2003). Anguillids in the western South Pacific, such as the two subspecies of Anguilla australis from Australia and New Zealand, the New Zealand longfin eel (Anguilla dieffenbachii) and the Australian longfin eel (Anguilla reinhartii), migrate far offshore to spawn in the South Equatorial Current according to collections of their larvae (Jellyman 2003;Kuroki et al 2008;Aoyama 2009) or data from satellite pop-up tagging studies of migrating silver eels (Jellyman and Tsukamoto 2010).…”

Section: Introductionmentioning

confidence: 99%

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The ecology of oceanic dispersal and survival of anguillid leptocephali

Miller

Tsukamoto

2017

Can. J. Fish. Aquat. Sci.

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Recruitment declines of anguillid eels are difficult to understand because both anthropogenic impacts on juveniles and adults and oceanic changes affecting larval survival or dispersal may be contributing. Anguillid larvae may passively disperse widely from offshore spawning areas but late-stage larvae or glass eels apparently must swim directionally to reach recruitment habitats. Their long larval durations vary among tropical (ϳ3-4 months) and temperate species (5 months to >1 year). The bodies of anguillid leptocephali are filled with transparent gelatinous material, possibly reducing predation rates and providing an energy reserve for swimming and metamorphosis. Leptocephali feed on marine snow making their first-feeding success linked to primary producers contributing to marine snow production. Alternations between ubiquitous cyanobacteria dominating in low-nutrient conditions and eukaryotic phytoplankton such as diatoms that are important for marine snow production dominating in high-nutrient conditions may influence early-larval survival at first-feeding due to many eggs simultaneously hatching within sympatric spawning areas. Fewer spawning eels resulting from population reductions and variations in early-larval survival may offer some explanations for lower and fluctuating recruitment in recent decades.Résumé : Les baisses du recrutement d'anguillidés sont difficiles à comprendre parce que des impacts de l'activité humaine sur les juvéniles et les adultes et des changements océaniques influant sur la survie et la dispersion des larves pourraient y participer. Les larves d'anguillidés peuvent se disperser largement de manière passive à partir de lieux de frai au large, mais les larves tardives ou les civelles doivent apparemment nager de manière directionnelle pour atteindre les habitats de recrutement. Leurs longues périodes larvaires sont différentes pour les espèces de climat tropical (de 3 à 4 mois) et tempéré (de 5 mois à >1 an). Les corps de leptocéphales d'anguillidés sont remplis d'une matière gélatineuse transparente, ce qui réduit possiblement les taux de prédation et fournit une réserve d'énergie pour la nage et la métamorphose. Les leptocéphales se nourrissent de neige marine, de sorte que la réussite après la résorption est reliée aux producteurs primaires qui contribuent à la production de neige marine. Des alternances de cyanobactéries ubiquistes dominantes dans des conditions pauvres en nutriments et de phytoplancton eucaryote comme des diatomées, importantes pour la production de neige marine, dominant dans des conditions riches en nutriments pourraient influencer la survie précoce des larves après la résorption en raison des nombreux oeufs qui éclosent simultanément dans des lieux de frai sympatriques. La baisse du nombre d'anguilles reproductrices découlant de la réduction des populations et des variations de la survie précoce des larves pourrait constituer une piste pour expliquer le recrutement plus faible et variable des récentes décennies. [Traduit par la Rédaction]

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Section: Distribution and Dispersal Of Anguillid Larvaementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The ecology of oceanic dispersal and survival of anguillid leptocephali

Miller

Tsukamoto

2017

Can. J. Fish. Aquat. Sci.

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“…They have retained marine spawning, although, of the 16 species now recognized (Watanabe et al 2009), the spawning areas of only 4 species are known. While tropical eels are presumed to undergo relatively short migrations to their spawning grounds (Aoyama et al 2003), migrations of temperate eels are extensive -typically 5000 to 6000 km in the case of the European eel A. anguilla (van den Thillart et al 2009). Classical means of delimiting spawning grounds have required the collection of progressively smaller larvae (e.g.…”

Section: Introductionmentioning

confidence: 99%

Vertical migrations may control maturation in migrating female Anguilla dieffenbachii

Jellyman¹,

Tsukamoto²

2010

Mar. Ecol. Prog. Ser.

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The marine spawning area of the New Zealand longfin eel Anguilla dieffenbachii is unknown. The present study used 3 popup tags to obtain information on the offshore swimming behaviour and possible swimming directions and destination of migrating eels. All 3 eels showed very consistent behaviour and underwent daytime dives to depths of 600 to 900 m, where they experienced temperatures of 6 to 7°C. These dives were followed by nighttime ascents to depths of 200 to 300 m. From the consistency of these dives, we propose that eels are using regular exposure to cool temperatures to regulate the rate of maturity. While swimming at depth could also reduce predation, the increased pressure would stimulate development of the ovaries, something mediated by ascent to shallower water. Comparisons of ascent locations and swimming speeds are consistent with spawning in the tropics, possibly in the South Fiji basin. KEY WORDS: Anguilla dieffenbachii · Freshwater eel · Diving · ThermoregulationResale or republication not permitted without written consent of the publisher

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“…Dengan demikian, tempat pemijahan A. celebesensis relatif dekat, sehingga tidak memerlukan waktu yang lama untuk mencapainya. Temuan ini sejalan dengan hipotesis Miller, et al (2002) dan Aoyama, et al (2003) tentang tempat pemijahan sidat tropis (Gambar 7). Gambar 7.…”

Section: Tingkat Kematangan Gonadunclassified

Biostatistik Sidat Perak Danau Poso

MELUMPI¹

2018

Preprint

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Indonesian waters has high level of eel biodiversity, which is recognized as the origin of the world eels. Poso Lake is one of the most abundant eel habitat, located in central part of Sulawesi Island. Like most of eels populations worldwide, the population in this lake has been declining and the causes are still uncertain. Very few studies had been undertaken regarding the eel population including the population in Poso Lake environment. As a response to an urgent need for research on the population biology of Poso Lake eel, the present study was conducted to provide base line information on silver eels or mature eels which captured during their on set spawning migration out of Poso Lake. A total of 100 eels which have silver eel characters were collected from weirs along the out let of Poso Lake over the study period. The sizes of eels captured ranged from 48,9 -136,8 cm with mean 78,3 cm in total length, and 265 -7025 g with mean 1289 g in body weight. Among them only 63 eels had gonadosomatic index (GSI) > 1%, had been determined as A. celebesensis (41) and A. marmorata (22), and they were all female. GSI values of A. celebesensis were significantly higher than A. marmorata. There were no apparent differences in the condition factor of the two eels species.Keywords: Silver eel, Poso Lake, Indonesia. PENDAHULUANSidat (Anguilla spp) memiliki pola hidup katadromous yang artinya mengawali hidup di laut dalam, bertumbuh di perairan tawar, dan setelah matang kelamin akan kembali beruaya ke laut untuk memijah. Selain memiliki pola hidup yang unik, sidat juga populer sebagai makanan yang mewah karena memiliki nilai nutrisi yang baik. Meskipun perairan Danau Poso (Gambar 1) telah dikenal sebagai salah satu sentra produksi sidat, namun informasi ilmiah tentang keberadaan sidat dan tingkat pemanfaatannya belum banyak diungkapkan. Semakin menurunnya hasil tangkapan sidat dari perairan ini, merupakan suatu pertanda bahwa penelitian yang mendasar tentang berbagai aspek kehidupannya perlu sedini mungkin dilaksanakan. Penguasaan pengetahuan tentang daur hidup dan habitat sidat yang kompleks, merupakan kunci menuju pemahaman atas berbagai persoalan terkait penurunan hasil tangkapan sidat tersebut. Hal ini, menjadi semakin penting, mengingat

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Short-Distance Spawning Migration of Tropical Freshwater Eels

Cited by 98 publications

References 11 publications

The ecology of oceanic dispersal and survival of anguillid leptocephali

The ecology of oceanic dispersal and survival of anguillid leptocephali

Vertical migrations may control maturation in migrating female Anguilla dieffenbachii

Biostatistik Sidat Perak Danau Poso

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