@article {7825,
	title = {Water temperature influences larval survival of the amphidromous goby <i>Sicyopterus lagocephalus</i>},
	journal = {Ecology of Freshwater Fish},
	year = {2021},
	month = {May-02-2022},
	abstract = {Water warming induced by human activities can impact fish larvae survival, notably because it influences larval development and prey abundances. Amphidromous gobies of the subfamily Sicydiinae are particularly sensitive to this threat as the newly hatched free embryos are poorly developed and the first feeding opportunity only occurs after they reach the ocean. Here, we studied how water temperature (21, 23, 25, 29 and 31{\textdegree}C) impacts early development stages of Sicyopterus lagocephalus in both freshwater and marine aquaria (salinity 35). We monitored survival time, larval condition and the occurrence of critical developmental events such as mouth opening, yolk sac and oil globule resorption. In freshwater, the survival exceeded 150 hours at 21{\textdegree}C, while it dropped below 50 hours at 31{\textdegree}C. In seawater, the larval development of unfed larvae was significantly affected by temperature, survival time being greatly reduced in warmer waters. Accounting for the observed duration between mouth opening and the resorption of the oil globule, we estimated that larvae need to find suitable prey in seawater within a short time: around 30 hours during the peak of reproduction in summer. Otherwise, their endogenous reserves become depleted and their condition degrades. This study emphasises the sensitivity of free embryos to stream flow alterations, which contributes to the increase in water temperature and to the slowing down of larvae drift to the ocean. We conclude that once in seawater the temperature and feeding conditions experienced by amphidromous larvae are critical for survival.},
	keywords = {amphidromy, Early life history, larval survival, mixed feeding period, starvation, water warming},
	issn = {0906-6691},
	doi = {10.1111/eff.12602},
	url = {https://onlinelibrary.wiley.com/doi/10.1111/eff.12602},
	author = {Teichert, Nils and Lagarde, Rapha{\"e}l and Occelli, Nicolas and Ponton, Dominique and Gaudin, Philippe}
}
@article {6737,
	title = {Distribution of anguillid leptocephali and possible spawning areas in the South Pacific Ocean},
	journal = {Progress in Oceanography},
	volume = {180},
	year = {2019},
	pages = {102234},
	abstract = {Seven South Pacific anguillid eel species live from New Guinea to French Polynesia, but their spawning areas and life histories are mostly unknown despite previous sampling surveys. A July{\textendash}October 2016 research cruise was conducted to study the spawning areas and times, and larval distributions of South Pacific anguillid eels, which included a short 155{\textdegree}E station-line northeast of New Guinea and five long transects (5{\textendash}25{\textdegree}S, 160{\textdegree}E{\textendash}140{\textdegree}W) crossing the South Equatorial (SEC) and other currents. This survey collected nearly 4000 anguilliform leptocephali at 179 stations using an Isaacs-Kidd Midwater Trawl accompanied by 104 CTD casts. Based on morphometric observations and DNA sequencing, 74 anguillid leptocephali were collected, which in the southern areas included 29 larvae of six species: Anguilla bicolor pacifica, A. marmorata, A. australis, A. reinhardtii, A. megastoma,and A. obscura (all anguillid species of the region were caught except A. dieffenbachii). Small A. australis (9.0{\textendash}16.8\&nbsp;mm) and A. reinhardtii (12.4, 12.5\&nbsp;mm) leptocephali were collected south of the Solomon Islands, other A. australis (10.8{\textendash}12.0\&nbsp;mm) larvae were caught northwest of Fiji along with an A. obscura (20.0\&nbsp;mm) larva, and an A. marmorata (7.8\&nbsp;mm) larva was collected near Samoa. Considering collection sites, larval ages from otolith analysis, and westward SEC drift, multiple spawning locations occurred from south of the Solomon Islands and the Fiji area (16{\textendash}20\&nbsp;days old larvae) to near Samoa (19\&nbsp;days old larva) during June and July in areas where high-salinity Subtropical Underwater (STUW, 150\&nbsp;m depth) and the warm, low-salinity surface Fresh Pool were present. Five long hydrographic sections showed the strong Fresh Pool in the west and the STUW formation area in the east.},
	keywords = {Early life history, Freshwater eels, Migration, otolith, South Pacific, Spawning},
	issn = {0079-6611},
	doi = {https://doi.org/10.1016/j.pocean.2019.102234},
	url = {http://www.sciencedirect.com/science/article/pii/S0079661119304148},
	author = {Mari Kuroki and Michael J. Miller and Eric Feunteun and Pierre Sasal and Timothy Pikering and Yu-San Han and Elisabeth Faliex and Anthony Acou and Aur{\'e}lie Dessier and Robert Schabetsberger and Shun Watanabe and Tatsuya Kawakami and Hiroaki Onda and Takatoshi Higuchi and Aya Takeuchi and Madoka Shimizu and Chinthaka A. Hewavitharane and Seishi Hagihara and Terumasa Taka and Shingo Kimura and Noritaka Mochioka and Tsuguo Otake and Katsumi Tsukamoto}
}
@article {4584,
	title = {Specific gravity and migratory patterns of amphidromous gobioid fish from Okinawa Island, Japan},
	journal = {Journal of Experimental Marine Biology and Ecology},
	volume = {486},
	year = {2017},
	pages = {160-169},
	abstract = {<p>Amphidromy is a diadromous life history pattern where fish spawn in freshwater, and their larvae drift downstream to the sea; the larvae develop in marine environments then migrate back in rivers to grow and reproduce. Two amphidromous types with different life history characteristics, such as egg and larval sizes, exist. To understand the ecology and early life history of amphidromous gobioid fish, six species from Okinawa Island were selected{\textemdash}two large egg-type species (Rhinogobius similis and Tridentiger kuroiwae) and four small egg-type species (Stiphodon percnopterygionus, Stenogobius sp., Sicyopterus lagocephalus, and Eleotris acanthopoma). The migratory pattern of four of these species was confirmed using otolith Sr:Ca and Ba:Ca ratios combined with water chemistry analysis. Although these species showed amphidromous migratory patterns, the timing of migration from estuarine to freshwater habitats was species-specific. The large egg-type, R. similis, showed three different migratory patterns: a long marine larval phase with a relatively fast migration from estuarine to freshwater habitats, a short marine larval phase with a relatively fast migration, and a gradual migration. Similar patterns of a long and fast migration or a gradual migration were seen in T. kuroiwae; however, the two small eggtype species, Sti. percnopterygionus and Stenogobius sp., showed rapid migration to freshwater after entering the river. To estimate larval ecology in the sea, ontogenetic changes in specific gravity (SG) were examined in all species. The SG was measured day and night for 1{\textendash}5 days until settlement in R. similis and T. kuroiwae, and until 10 days after hatching in the other species. The SG of all species ranged from 1.0138 to 1.0488, and varied among ontogenetic stages and between day and night and species. Larval SG was relatively similar between R. similis and T. kuroiwae, with low SG in the early stages and high SG after yolk absorption. During the late larval stages and until settlement, T. kuroiwae showed diel changes in SG, with higher SG during the day, whereas R. similis had a relatively constant pattern. The diel changes of T. kuroiwae larvae suggest different activity during the day and at night (e.g. diel vertical migration). In the four small egg-type species, SG was high at hatching and decreased thereafter, not showing large diel changes. The results suggest that sympatric amphidromous gobioid species have various early life histories that may be influenced by several larval traits, including SG.</p>
},
	keywords = {Buoyancy, diadromy, Early life history, Migratory history, otolith, Specific gravity},
	author = {Iida, Midori and Masashi Kondo and H{\'e}l{\`e}ne Tabouret and Maeda, Ken and P{\'e}cheyran, C and Atsushi Hagiwara and Philippe Keith and Katsunori Tachihara}
}
