An index for the management of South African estuaries for juvenile fish recruitment from the marine environment

1999 ◽  
Vol 6 (5) ◽  
pp. 421-436 ◽  
Author(s):  
N. W. Quinn ◽  
C. M. Breen ◽  
A. K. Whitfield ◽  
J. W. Hearne
Keyword(s):  
South African ◽  
Marine Environment ◽  
Juvenile Fish ◽  
Fish Recruitment

scholarly journals Lost at sea: A pilot study investigating DNA recovery from teeth in a South African natural marine environment

2019 ◽  
Vol 7 (1) ◽  
pp. 580-581 ◽  
Author(s):  
Chandra Finaughty ◽  
Victoria E. Gibbon ◽  
Belinda Speed ◽  
Laura J. Heathfield
Keyword(s):  
Pilot Study ◽  
South African ◽  
Marine Environment ◽  
Dna Recovery

Impact of climate and hydrology on juvenile fish recruitment towards estuarine nursery grounds in the context of climate change

2009 ◽  
Vol 85 (3) ◽  
pp. 479-486 ◽  
Author(s):  
Catarina Vinagre ◽  
Filipe Duarte Santos ◽  
Henrique Nogueira Cabral ◽  
Maria José Costa
Keyword(s):  
Climate Change ◽  
Juvenile Fish ◽  
Nursery Grounds ◽  
Fish Recruitment

Gyrodactylids (Gyrodactylidae, Monogenea) infecting Oreochromis niloticus niloticus (L.) and O. mossambicus (Peters) (Cichlidae): A pan-global survey

2010 ◽  
Vol 55 (3) ◽  
Author(s):  
Adriana García-Vásquez ◽  
Haakon Hansen ◽  
Kevin Christison ◽  
Miquel Rubio-Godoy ◽  
James Bron ◽  
...  
Keyword(s):  
South African ◽  
Oreochromis Niloticus ◽  
Dominant Species ◽  
Juvenile Fish ◽  
Principal Component ◽  
Oreochromis Mossambicus ◽  
Molecular Data ◽  
Molecular Analyses ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Two Populations

AbstractGyrodactylus infections in intensively-reared populations of Nile tilapia, Oreochromis niloticus niloticus, have been associated world-wide with high mortalities of juvenile fish. In this study, 26 populations of Gyrodactylus parasitising either O. n. niloticus or Mozambique tilapia, Oreochromis mossambicus, were sampled from fourteen countries and compared with type material of Gyrodactylus cichlidarum Paperna, 1968, Gyrodactylus niloticus (syn. of G. cichlidarum) and Gyrodactylus shariffi Cone, Arthur et Bondad-Reantaso, 1995. Representative specimens from each population were bisected, each half being used for morphological and molecular analyses. Principal component analyses (PCA) identified five distinct clusters: (1) a cluster representing G. cichlidarum collected from O. n. niloticus from 13 countries; (2) the G. shariffi paratype; (3) three specimens with pronounced ventral bar processes collected from two populations of Mexican O. n. niloticus (Gyrodactylus sp. 1); (4) four specimens collected from an Ethiopian population nominally identified as O. n. niloticus (Gyrodactylus sp. 2); (5) nine gyrodactylids from South African O. mossambicus (Gyrodactylus sp. 3). Molecular analyses comparing the sequence of the ribosomal transcribed spacer regions (ITS 1 and 2) and the 5.8S gene from the non-hook bearing half of worms representative for each population and for each cluster of parasites, confirmed the presence of G. cichlidarum in most samples analysed. Molecular data also confirmed that the DNA sequence of Gyrodactylus sp. 2 and Gyrodactylus sp. 3 (the morphologically-cryptic group of South African specimens from O. mossambicus) differed from that of G. cichlidarum and therefore represent new species; no sequences were obtained from Gyrodactylus sp. 1. The current study demonstrates that G. cichlidarum is the dominant species infecting O. n. niloticus, being found in 13 of the 15 countries sampled.

Larval Fish Transport and Retention and the Importance of Location for Juvenile Fish Recruitment in Upper Klamath Lake, Oregon

2009 ◽  
Vol 138 (2) ◽  
pp. 328-347 ◽  
Author(s):  
Douglas F. Markle ◽  
Susan A. Reithel ◽  
John Crandall ◽  
Tammy Wood ◽  
Torrey J. Tyler ◽  
...  
Keyword(s):  
Larval Fish ◽  
Juvenile Fish ◽  
Fish Recruitment ◽  
Upper Klamath Lake ◽  
Klamath Lake

Consistent timing of juvenile fish recruitment to seagrass beds within two Sydney estuaries

2000 ◽  
Vol 51 (8) ◽  
pp. 765 ◽  
Author(s):  
Kimberley A. Smith ◽  
Iain M. Suthers
Keyword(s):  
Juvenile Fish ◽  
Estuarine Circulation ◽  
Seagrass Habitat ◽  
Seagrass Beds ◽  
Temporal Partitioning ◽  
Estuarine Species ◽  
Fish Recruitment ◽  
Spatial Differences ◽  
Recruitment Patterns ◽  
One Year

Recruitment patterns of juvenile Rhabdosargus sarba (Sparidae) and Pelates sexlineatus (Terapontidae) were examined by frequent (1–4 weeks) beach seining of seagrass beds in Sydney, south-east Australia. Two sites within each of two estuaries (Botany Bay and Pitt Water) were sampled for one year. One site within Botany Bay was sampled for 3 years. A total of 12 824 juveniles of R. sarba and 7037 juveniles of P. sexlineatus were collected. R. sarba recruited in 4 pulses during winter/spring, while P. sexlineatus recruited in 6 pulses during summer/autumn, and the timing of recruitment events was consistent among locations and years. P. sexlineatus recruitment coincided with new moons, but R. sarba recruitment dates were less precisely determined. Predictable annual recruitment patterns result in temporal partitioning of seagrass habitat between these two abundant estuarine species. Spatial differences in magnitude of recruitment events among sites reflected patterns of estuarine circulation.

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