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.

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.

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).

Chordata: Fish eggs and larvae

2017 ◽  
Author(s):  
Peter Munk ◽  
Jørgen G. Nielsen
Keyword(s):  
Life Cycle ◽  
Tree Of Life ◽  
Fish Eggs ◽  
General Morphology ◽  
Family Level ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

This chapter describes the taxonomy of fish eggs and larvae. Most fish eggs and larvae are planktonic, and are commonly found in plankton net tows. Collectively these fish stages are referred to as ichthyoplankton. The chapter covers their life cycle, ecology, and general morphology. It includes a section that indicates the systematic placement of the taxon described within the tree of life, and lists the key marine representative illustrated in the chapter (usually to genus or family level). This section also provides information on the taxonomic authorities responsible for the classification adopted, recent changes which might have occurred, and lists relevant taxonomic sources.

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