scholarly journals Marginal lagoons: natural nurseries of migratory fish

2021 ◽  
Vol 16 (2) ◽  
pp. 27-45
Author(s):  
Fábio Pereira Arantes ◽  
José Enemir Santos ◽  
Marcus Túlio Rocha Vieira Bernardes ◽  
Nilo Bazzoli ◽  
Lucas Marcon
Keyword(s):  
Migratory Fish

As lagoas marginais constituem ambiente complexo que potencializa o sucesso reprodutivo das espécies migratórias, fornecendo abrigo e recursos. Nosso estudo avalia o papel dessas lagoas no recrutamento de espécies migratórias no rio Jequitaí. Durante um ano, foram realizadas amostragens mensais em quatro lagoas marginais do rio Jequitaí: Lagoão (LAG), Renero (REN), Buriti (BUR) e Tamatião (TAMA). Foram capturados 1.049 indivíduos pertencentes a sete espécies de peixes migradores: Brycon orthotaenia, Megaleporinus obtusidens, Prochilodus argenteus, Prochilodus costatus, Pseudoplatystoma corruscans, Salminus franciscanus e Salminus hilarii. O comprimento médio dos exemplares capturados foi de 13,6 cm e o peso corporal médio de 80,7 g, evidenciando o predomínio de peixes jovens. A espécie mais representativa em números absolutos foi L. obtusidens (41,47%) enquanto P. costatus foi a mais representativa (24,57%) na biomassa. Salminus hilarii e i apresentaram as menores taxas de aumento do comprimento corporal (1,90 e 2,10, respectivamente). S. franciscanus e M. obtusidens aumentaram seu comprimento em 4 e 3,6 vezes, respectivamente. Além disso, S. franciscanus e M. obtusidens aumentaram seu peso em 81,3 e 102,4 vezes, respectivamente. Os resultados do presente estudo mostraram como as lagoas marginais podem funcionar como grandes berçários para o desenvolvimento e recrutamento de peixes migradores, contribuindo assim para a conservação de peixes de importância comercial e ecológica. Além disso, este estudo reduz a escassez de conhecimento sobre o uso de lagoas marginais por espécies de peixes migradores e destaca a importância desses ambientes.

Temporal variation in the diet of Yangtze finless porpoise calls for conservation of semi‐migratory fish

2021 ◽  
Author(s):  
Jiwei Yang ◽  
Kang Wang ◽  
Zhigang Mei ◽  
Jun Xu ◽  
Jinsong Zheng ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Migratory Fish ◽  
Finless Porpoise ◽  
Yangtze Finless Porpoise

scholarly journals A description of mercury in fishes from the Madeira River Basin, Amazon, Brazil

2008 ◽  
Vol 38 (3) ◽  
pp. 431-438 ◽  
Author(s):  
Wanderley Rodrigues Bastos ◽  
Mauro de Freitas Rebelo ◽  
Márlon de Freitas Fonseca ◽  
Ronaldo de Almeida ◽  
Olaf Malm
Keyword(s):  
Body Weight ◽  
River Basin ◽  
Fish Species ◽  
Temporal Trends ◽  
Migratory Fish ◽  
Madeira River ◽  
Interspecies Variability ◽  
Total Hg ◽  
Madeira River Basin ◽  
Hg Accumulation

Over the last 20 years several projects carried on the Madeira River basin in the Amazon produced a great amount data on total Hg concentration in different fish species. In this paper we discuss temporal trends in Hg contamination and its relation to body weight in some of those fishes, showing that even within similar groups, such as carnivorous and non-migratory fish, the interspecies variability in Hg accumulation is considerable.

Salinity tolerance of larval and juvenile broad whitefish (Coregonus nasus)

1989 ◽  
Vol 67 (10) ◽  
pp. 2392-2397 ◽  
Author(s):  
B. G. E. de March
Keyword(s):  
Salinity Tolerance ◽  
Species Distribution ◽  
Laboratory Experiments ◽  
Larval Fish ◽  
The Arctic ◽  
Distribution Data ◽  
Migratory Fish ◽  
Limited Information ◽  
Time To Death ◽  
Arctic Coast

In the absence of distribution data for juvenile broad whitefish, Coregonus nasus, laboratory experiments were designed to elucidate the salinity ranges that the species will tolerate. Larval fish (12–18 mm) died within 120 h at salinities of 12.5‰ and higher at both 5 and 10 °C, though more slowly at 5 °C. Salinities of 12.5 and 15‰, but no higher, were tolerated for 120 h at 15 °C. Larvae fed readily at 15 °C but not at 5 or 10 °C. Slightly larger and more-developed larvae (15–19 mm) were tolerant of 12.5‰ but died within 120 h at 15‰ at the same three temperatures. These fish fed more readily than the younger ones. Larger fish (33–68 mm) were generally tolerant of 15–20‰ but not of higher salinities in 120-h tolerance tests. Larger field-collected fish (27–200 mm) reacted similarly but were more tolerant of salinities between 20 and 27‰ in 96-h tests. Analysis of both experiments with larger fish suggests that time to death was inversely related to size as well as to salinity. Coregonus nasus does not seem to be more tolerant of saline conditions than other freshwater or migratory fish species. Experimental results combined with limited information about the species' distribution suggest that man-made constructions on the arctic coast might seriously affect dispersal or annual migrations.

Ascent of neotropical migratory fish in the Itaipu Reservoir fish pass

2011 ◽  
Vol 27 (4) ◽  
pp. 511-519 ◽  
Author(s):  
S. Makrakis ◽  
L. E. Miranda ◽  
L. C. Gomes ◽  
M. C. Makrakis ◽  
H. M. F. Junior
Keyword(s):  
Migratory Fish ◽  
Fish Pass

scholarly journals Addressing fish-passage issues at hydropower and irrigation infrastructure projects in Indonesia

2018 ◽  
Vol 69 (12) ◽  
pp. 1805 ◽  
Author(s):  
Lee J. Baumgartner ◽  
Arif Wibowo
Keyword(s):  
Life History ◽  
Fish Passage ◽  
Mitigation Measures ◽  
Migratory Fish ◽  
Tropical Island ◽  
Life History Stages ◽  
Barrier Effects ◽  
Sumatra Island ◽  
Irrigation Infrastructure

Development activities threaten the long-term sustainability of tropical floodplain systems. The construction of dams, weirs, irrigation infrastructure and regulators affect connectivity among habitats and can facilitate rapid declines in riverine biota, especially fish. Indonesia is a tropical island country with an abundance of monsoonal rivers. Massive expansions in hydropower and irrigation infrastructure are planned over the next two decades and mitigation measures will be needed to protect migratory fish. Most Indonesian freshwater fish need to migrate among habitats to complete essential life-history stages. So, strategies are urgently needed to mitigate the barrier effects of river infrastructure to ensure the long-term sustainability of river fishes. A common tool used worldwide is the construction of upstream and downstream fish passes. Only two fish passes exist in Indonesia. One at Perjaya Irrigation Dam on the Komering River (Sumatra island) and another on Poso Dam on the Poso River (Sulawesi island). Neither of these structures has been assessed and many other projects are proceeding without considering potential impacts on fisheries. The proposed infrastructure upgrades over the next two decades provide a once-in-a-generation opportunity to ensure that migratory fish are adequately protected into the future.

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