scholarly journals Spatial and temporal distribution of fish eggs and larvae in a subtropical coastal lagoon, Santa Catarina State, Brazil

2009 ◽  
Vol 7 (2) ◽  
pp. 231-240 ◽  
Author(s):  
Luis C. P. Macedo-Soares ◽  
Alesandra B. Birolo ◽  
Andrea S. Freire
Keyword(s):  
Coastal Lagoon ◽  
Temporal Distribution ◽  
Abundance Distribution ◽  
Fish Eggs ◽  
Coastal Fish ◽  
The Family ◽  
The Mean ◽  
Eggs And Larvae ◽  
Distribution Of Fish ◽  
Fish Eggs And Larvae

This study investigated the variation in abundance, distribution and composition of ichthyoplankton in a lagoon in southern Brazil through the year and at different stations within the lagoon. Ibiraquera Lagoon is a shallow coastal lagoon connected to the sea by a semi-permanent sandbar. Ichthyoplankton samples were collected monthly from December 2003 to December 2004, with a 200 µm mesh net using horizontal surface hauls. A colder, drier period was detected, contrasting with warm months during which salinity varied depending on rainfall and whether the sandbar was open or closed. The mean abundance of ichthyoplankton over the study period was 459.6 ± 76.2 (SE) eggs · 100 m-3 and 63.6 ± 7.9 (SE) larvae · 100 m-3, and they were present during all months. Significantly higher abundances of eggs and larvae were observed during warm months. The community was dominated by the family Engraulidae followed by Clupeidae, Gobiidae and Mugilidae. Engraulidae and Clupeidae were present throughout the year, with greater abundances in months with higher temperatures. Some coastal fish species spawn in Ibiraquera Lagoon, mainly near to the sandbar, demonstrating that the lagoon is a spawning area for coastal stock. We recommend the establishment of environmental procedures to promote the conservation of Ibiraquera Lagoon and its ichthyoplankton community.

scholarly journals Spatial and temporal distribution of ichthyoplankton in the upper Uruguay river, Brazil

2009 ◽  
Vol 52 (4) ◽  
pp. 933-944 ◽  
Author(s):  
Samara Hermes-Silva ◽  
David Reynalte-Tataje ◽  
Evoy Zaniboni-Filho
Keyword(s):  
Temporal Distribution ◽  
Spatial And Temporal Distribution ◽  
Fish Eggs ◽  
Spawning Grounds ◽  
Main River ◽  
Eggs And Larvae ◽  
Uruguay River ◽  
Fish Eggs And Larvae

The distribution and abundance of fish eggs and larvae was analyzed in three sections of the Upper Uruguay river, in a stretch of 290 km. Samples were collected monthly from October, 2001 to March, 2002 during 48-h cycles at 6-h intervals between each sampling. Surface and bottom samples were collected with a 0.5-mm mesh cylindroconical net. Fishes from the Upper Uruguay river were reproductively active mainly from October to January, and this activity was more intense at the Ligeiro and Chapecó tributaries and Chapecó main river. It was observed that the tributaries are important spawning grounds and larval nursery sites, indicating the importance of preserving such environments.

scholarly journals Effect of abiotic variables on fish eggs and larvae distribution in headwaters of Cuiabá River, Mato Grosso State, Brazil

2012 ◽  
Vol 10 (1) ◽  
pp. 123-132 ◽  
Author(s):  
Simoni Ramalho Ziober ◽  
Andréa Bialetzki ◽  
Lúcia Aparecida de Fátima Mateus
Keyword(s):  
Larval Density ◽  
Temporal Distribution ◽  
Significant Negative Correlation ◽  
Fish Eggs ◽  
Mato Grosso ◽  
River Level ◽  
Paraguay River ◽  
Main River ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

Researches on ichthyoplankton seems to be an important tool to identification of spawning areas and periods for freshwater fish. Ichthyoplankton was sampled monthly in the headwaters of the Cuiabá River, upper Paraguay River basin, (Mato Grosso State, Brazil), and in four of its tributaries, between November 2007 and March 2008, to evaluate the spatial and temporal distribution of fish eggs and larvae and the influence of regional and local variables on their distribution. In total, 22,067 eggs and 1,045 larvae were collected. A significant negative correlation was found between egg density and the variables of river level and flow volume. Larval density was not significantly correlated with any of the regional variables. The egg and larval densities were significantly higher at the sampling sites in the main river. The highest densities were found in environments with greater river widths, intermediate depths and lowest values of dissolved oxygen, electrical conductivity, and transparency. Anostomidae, Zungaro zungaro, Bryconamericus spp., Pimelodus spp., Pimelodidae, Auchenipteridae, and Siluriformes were the most abundant groups of larvae, and were observed at the sampling sites in the main river. The study site is an important spawning area for migratory and, non-migratory fish species, and highlight the importance of the main river to the reproductive event, by the influence of local variables transparency and river width, which in turn maybe temporally influenced by the river level.

Seasonal distribution of fish eggs and larvae off sinop (the southern Black Sea) in 1999-2000

2003 ◽  
Vol 24 ◽  
pp. S275-S280 ◽  
Author(s):  
Hasan Huseyin Satilmis ◽  
Anna D. Gordina ◽  
Levent Bat ◽  
Recep Bircan ◽  
Mehmet Culha ◽  
...  
Keyword(s):  
Black Sea ◽  
Seasonal Distribution ◽  
Fish Eggs ◽  
Eggs And Larvae ◽  
Distribution Of Fish ◽  
Fish Eggs And Larvae

scholarly journals Ichthyoplankton distribution and abundance off southeastern and southern Brazil

2004 ◽  
Vol 47 (4) ◽  
pp. 601-612 ◽  
Author(s):  
Débora Martins de Freitas ◽  
José Henrique Muelbert
Keyword(s):  
Coastal Waters ◽  
Fish Larvae ◽  
Bottom Layer ◽  
Brazilian Coast ◽  
Fish Eggs ◽  
Near Shore ◽  
Partial Overlap ◽  
Eggs And Larvae ◽  
Distribution Of Fish ◽  
Fish Eggs And Larvae

This study describes the distribution of fish eggs and larvae along the southeastern and southern Brazilian coast. Plankton samples were collected at 85 stations using a Bongo net, and water salinity and temperature were profiled with a CTD. Results showed that fish eggs and larvae, and zooplankton biovolume were distributed in coastal waters with mean temperature of 23ºC and salinity between 33 and 34. The largest egg abundance occurred along Iguape (24º'S) with a partial overlap with zooplankton biovolume and fish larvae were most abundant near shore close to Santos (24ºS). These protected coastal waters presented a surface layer with lower salinity and higher temperatures, while the bottom layer had cooler water. Ichthyoplankton abundance was low off Cabo Frio (22º'S), while a maximum in fish eggs occurred around Cabo Santa Marta Grande (28ºS).

scholarly journals Drifting in a free-flowing river: Distribution of fish eggs and larvae in a small tributary of a Neotropical reservoir

2021 ◽  
Vol 21 (4) ◽  
Author(s):  
Valter M. Azevedo-Santos ◽  
Vanessa S. Daga ◽  
Fernando M. Pelicice ◽  
Raoul Henry
Keyword(s):  
Fish Species ◽  
Reproductive Activity ◽  
Temporal Variations ◽  
Fish Eggs ◽  
Long Distance ◽  
Spawning Site ◽  
Reproductive Cycles ◽  
Eggs And Larvae ◽  
Distribution Of Fish ◽  
Fish Eggs And Larvae

Abstract: We investigated spatial and temporal variations in the distribution of fish eggs and larvae in the Guareí River, a free-flowing tributary located in the upper section of the Jurumirim Reservoir, Paranapanema River, Brazil. Fish eggs and larvae were sampled ~ fortnightly from November 2017 to March 2018 (Cycle 1), and from November 2018 to March 2019 (Cycle 2), at three sites distributed along the entire course of the Guareí River. We collected 859 fish eggs and 1,340 larvae, comprising 19 taxa. We found reproductive activity of several fish species in the Guareí River, including long-distance migrants. However, there was no spatial differences in the assemblage structure and densities of fish eggs and larvae along the channel of Guareí River. We recorded temporal differences in larvae density only in Cycle 2. The consistent capture of fish eggs and larvae in two reproductive cycles is strong evidence that this river is a spawning site for a variety of fish species. Thus, we recommend maintaining its natural flow regime.

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