scholarly journals Environmental conditions influencing the larval fish assemblage during summer in the Gulf of Gabes (Tunisia: South central Mediterranean)

2015 ◽  
Vol 16 (3) ◽  
pp. 666 ◽  
Author(s):  
W. K. KOCHED ◽  
F. ALEMANY ◽  
S. BEN ISMAIL ◽  
R. BENMESSAOUD ◽  
Α. HATTOUR ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Fish Assemblages ◽  
Larval Fish ◽  
Fish Larvae ◽  
Surface Mixed Layer ◽  
Gulf Of Gabes ◽  
Predator Species ◽  
Pelagic Species ◽  
Gulf Of Gabès ◽  
South Central

An oceanographic survey was carried out during the summer of 2009, from June 25 to July 3 in the Gulf of Gabes. The study area is characterized by a wide continental shelf.A plankton sampling scheme was carried out to study the structure of the larval fish assemblages that characterizes the surface mixed layer, and to assess the influence of the environmental parameters on their spatial distribution.A total of 36 taxa were identified, 3 classified to the level of genus, 5 to family and 28 to species. The majority of identified fish larvae belonged to demersal species, mainly picarel Spicara smaris (23.76% of the total larval fish abundance), followed by red mullet Mullus barbatus (14.92%) and several species of the Sparidae family (9.15%). Small pelagic species as Sardinella Sardinella aurita and European anchovy Engraulis encrasicolus were also abundant (27.75 %) and dominated the fish larvae community in offshore stations. Five large pelagic species were found among the larvae, including bullet tuna Auxis rochei, Atlantic black skipjack Euthynnus alletteratus, albacore Thunnus alalunga, swordfish Xiphias gladius and the highly migratory Atlantic bluefin tuna Thunnus thynnus. All these apex predator species appear in 38.5% of the sampling stations and contribute about 7.9% of the total larval catches. The larval fish assemblage of the Gulf of Gabes is predominantly composed of neritic species in correspondence with the shallow depths of the study area. Canonical Correspondence Analysis (CCA) showed that larval distributions were mainly conditioned by depth. However, other factors, like hydrographic processes, play also a very important role in shaping the spatial pattern of larval fish distribution.

Adult and larval fish assemblages vary among small tributary mouths of Green Bay, Lake Michigan

2021 ◽  
Author(s):  
Amelia T McReynolds ◽  
Megan L. Hoff ◽  
Angelena A. Sikora ◽  
Cynthia I. Nau ◽  
Michael J. Pietraszek ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Lake Michigan ◽  
Fish Assemblages ◽  
Water Movement ◽  
Larval Fish ◽  
Spatial Dynamics ◽  
Spatial And Temporal Variation ◽  
Adult Fish ◽  
Green Bay ◽  
Small Tributary

Small tributaries of the Great Lakes serve as important habitat during critical life stages of many fish species, though temporal and spatial dynamics of the assemblage that uses these systems are seldom investigated. This study quantifies larval and adult fish assemblages captured by fyke net and light traps among small tributary mouths of Green Bay, Lake Michigan. Ten tributaries harbored a total of forty-five species representing seventeen families, with the most abundant including spottail shiner (Notropis hudsonius (Clinton 1824)) in adult assemblages and white sucker (Catostomus commersonii (Lacepède 1803)) in larval assemblages. Larval fish assemblage structures differed over five biweekly sampling events in May and June. Adult fish assemblage structures varied among tributaries but not among spring, summer, and fall samples. Larval and adult species assemblages at these rivermouths are likely influenced by hydrology, habitat structure, and species-specific ecology. Water movement may transport larvae into rivermouths, as larval assemblages were dominated by species that spawn in coastal habitats. Adult species richness varied with longitude, with the greatest diversity in tributaries on the west shore. This investigation of fish assemblages highlights the spatial and temporal variation that occurs in these systems and their role in shaping fish populations in Green Bay.

Age, growth, sexual maturity and reproduction of the thornback ray,Raja clavata(L.), of the Gulf of Gabès (south-central Mediterranean Sea)

2013 ◽  
Vol 10 (4) ◽  
pp. 416-425 ◽  
Author(s):  
Hasna Kadri ◽  
Sondes Marouani ◽  
Bechir Saïdi ◽  
Mohamed Nejmeddine Bradai ◽  
Abderrahmen Bouaïn ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Sexual Maturity ◽  
Central Mediterranean ◽  
Gulf Of Gabes ◽  
Gulf Of Gabès ◽  
South Central ◽  
Thornback Ray ◽  
Raja Clavata ◽  
Central Mediterranean Sea

scholarly journals DISTRIBUCIÓN Y DENSIDAD DE ICTIOPLANCTON EN EL ESTUARIO DE BAHÍA MÁLAGA, PACÍFICO COLOMBIANO (SEPTIEMBRE DE 2009-FEBRERO DE 2010)

2016 ◽  
Vol 43 (1) ◽  
Author(s):  
Diana Medina Contreras ◽  
Jaime Cantera ◽  
Eugenia Escarria ◽  
Luz M Mejía Ladino
Keyword(s):  
Fish Assemblages ◽  
Larval Fish ◽  
Fish Larvae ◽  
Larval Density ◽  
Temporal Distribution ◽  
Mesh Size ◽  
Temporal Variations ◽  
Taxonomic Composition ◽  
Total Density ◽  
The Relationship

The density, taxonomic composition, and spatial and temporal distribution of the estuarine ichthyoplankton of Bahía Málaga (Pacific coast of Colombia) are described, as well as the relationship between biological parameters and some physicochemical variables. Samples were collected at 12 stations along the principal navigation canal; these samples were taken in four areas following the design of Barletta-Bergan. Surface sweeps were carried out with a conical-cylindrical net (mesh size 500 µm, mouth diameter 0.6 m, length 3.5 m). Salinity and temperature were measured before each sweep. A total of 69019 larvae/1000 m³, representing 23 families, 36 genera and 40 species were collected during monthly sampling from September, 2009 to February, 2010. Carangidae (39.0%) was the most abundant family, followed by Sciaenidae (27.1%) and Engraulidae (20.1%). The most frequent families were Sciaenidae (26.6%), followed by Carangidae (22.8%) and Engraulidae (14.7%) which are important families in larval fish assemblages in tropical estuaries. Eighty percent of total density was provided by six species, of which Seriola morphotype 1 (Carangidae) and Cetengraulis mysticetus (Engraulidae) were the most abundant and dominant. No correlation was found between density and salinity (Spearman, R = 0.23) or temperature (Spearman, R = 0.51). Analysis of spatial and temporal variations of larval density shows significant differences among the months sampled (Anova, p = 0.0029; p < 0.05), but not among areas (Anova, p = 0.078), suggesting that Bahía Málaga offers adequate conditions for the presence of fish larvae.

The larval fish assemblage of the Nornalup-Walpole Estuary, a permanently open estuary on the southern coast of Western Australia

1994 ◽  
Vol 45 (7) ◽  
pp. 1193 ◽  
Author(s):  
FJ Neira ◽  
IC Potter
Keyword(s):  
Western Australia ◽  
Fish Assemblage ◽  
Larval Fish ◽  
Fish Larvae ◽  
Marine Species ◽  
Abundant Species ◽  
Entrance Channel ◽  
Southern Coast ◽  
Outer Basin

Fish larvae were sampled in the entrance channel and in the two basins of the permanently open Nornalup-Walpole Estuary, on the southern coast of Western Australia, in each month between October 1989 and September 1990. Sampling yielded a total of 39 068 larvae belonging to 36 species and 23 families, with the engraulidid Engraulis australis (56.7%) and the gobies Pseudogobius olorum (24.4%) and Favonigobius lateralis (15.0%) being the most abundant species. Most of the larvae were caught between November and March, with the concentrations of the most abundant species reaching peaks between January and March, when water temperatures had reached 21-24�C. In terms of number of larvae, the larval fish assemblage in the basins was dominated by species that spawn within the estuary, with the larvae of these species contributing ≥98.7% to the totals at the basin sites. Although the larvae of 26 marine species were caught in the entrance channel, these were either rare or absent in the basins, except for those of the terapontid Pelates sexlineatus, which were moderately abundant in the outer basin. The fact that the larvae of most of these marine species were at the preflexion stage, and that all but three of those species had never been previously recorded as either juveniles or adults within the system, indicates that they were passively transported from outside the estuary. The absence of larvae of most of the marine teleosts that are abundant in the basins of the Nornalup-Walpole Estuary parallels the situation in the nearby and seasonally closed Wilson Inlet.

scholarly journals Interannual variation of larval fish assemblages in the Gulf of Cádiz (SW Iberian Peninsula) in relation to summer oceanographic conditions

2006 ◽  
Vol 49 (2) ◽  
pp. 287-296 ◽  
Author(s):  
Paulo Mafalda Júnior ◽  
Juan Perez de Rubín
Keyword(s):  
Fish Assemblages ◽  
Larval Fish ◽  
Fish Larvae ◽  
Water Discharge ◽  
Estuarine System ◽  
Interannual Variations ◽  
Gulf Of Cadiz ◽  
Engraulis Encrasicolus ◽  
Gulf Of Cádiz ◽  
Sardinella Aurita

Two ichthyoplankton surveys were conducted during July 1994 and July 1995 in the Gulf of Cádiz with the aim of describing composition, abundance, distribution patterns and interannual variations of larval fish assemblages. Interannual differences were found in this study. In 1994, higher salinities were observed at external sites, though in 1995, higher values were observed at intermediate sites. The upper water column was warmer in 1994 and had less fish larvae density. During 1994, Sardinella aurita and Engraulis encrasicolus were abundant but spatial location was opposite. In 1995, abundance of both species was very different, but with similar spatial pattern. Cluster analysis revealed well-defined groups of stations and assemblages of larvae, primarily related to bathymetry. The "inshore assemblage" occupied the shallow coast area; its characteristics species being closely related to the estuarine system, mainly comprising Engraulis encrasicolus and Gobiidae. The "shelf assemblage" occupied the continental shelf and its characteristics species consisted of larvae whose adults inhabited the shelf province and spawn in the same zone, like Sardinella aurita and Trachurus spp. Interannual variations in composition and extension of the subgroups could be attributed to the main circulation patterns, continental water discharge and spawning strategies of fishes.

Spawning habitats of two small pelagic species (Engraulis encrasicolus and Sardinella aurita) in the Gulf of Gabès (Central Mediterranean)

Hydrobiologia ◽  
2017 ◽  
Vol 821 (1) ◽  
pp. 11-24 ◽  
Author(s):  
Rafik Zarrad ◽  
Francisco Alemany ◽  
Othman Jarboui ◽  
Hechmi Missaoui ◽  
Alberto Garcia
Keyword(s):  
Central Mediterranean ◽  
Gulf Of Gabes ◽  
Pelagic Species ◽  
Engraulis Encrasicolus ◽  
Gulf Of Gabès ◽  
Sardinella Aurita ◽  
Spawning Habitats

scholarly journals A snapshot on composition and distribution of fish larvae across the North Atlantic Ocean

2021 ◽  
Vol 22 (10) ◽  
Author(s):  
Mohd Nasarudin Harith ◽  
Cieran O'Donnell ◽  
GRAHAM JOHNSTON ◽  
Anne Marie Power
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
Fish Assemblages ◽  
North Atlantic Ocean ◽  
Current Knowledge ◽  
Larval Fish ◽  
Fish Larvae ◽  
The North ◽  
The North Atlantic ◽  
Distribution Of Fish

Abstract. Harith MN, O’ Donnell C, Johnston G, Power AM. 2021. A snapshot on composition and distribution of fish larvae across the North Atlantic Ocean. Biodiversitas 22: 4496-4504. This study aims to describe the composition and distribution patterns of fish larvae communities across the North Atlantic Ocean. Several cruises were involved in the effort to collect the fish larvae samples. The sampling took place on the east side of the North Atlantic Ocean, towards the mid-Atlantic Ocean, and on the west side of the North Atlantic Ocean, near the eddies approaching Flemish Cap. A total of 9522 fish larvae were collected and identified from these surveys. These larvae came from 79 taxa and 29 families. Referring to the total abundance, considering all the sampled stations, Atlantic mackerel (Scomber scombrus) was the most abundant species (38.82% of the total fish larvae abundance), followed by blue whiting (Micromesistius poutassou) (15.9%). Referring to the Multi-dimensional scaling (MDS) ordination plots, two major stations clusters separate the on-shelf and off-shelf stations supported by SIMPER analysis. This study provides a snapshot of larval fish concentrations and assembly structure, but current knowledge suggests that the distribution of larval fish assemblages will be highly spatially variable, more research into plume front dynamics and their effects on the region's biota is needed to predict and understand changes.

Balancing Fisheries Management and Water Uses for Impounded River Systems

2008 ◽  
Keyword(s):  
Fisheries Management ◽  
Flood Control ◽  
Fish Assemblages ◽  
Larval Fish ◽  
Length Distribution ◽  
Gizzard Shad ◽  
Length Frequency Distribution ◽  
Dorosoma Cepedianum ◽  
Predator Species ◽  
Water Uses

<em>Abstract</em>.—Larval fish assemblages are an important component of reservoir communities by providing an abundant prey source critical to the recruitment of predator species into recreational fisheries. We examined the composition, abundance, and length distribution of larval fish in several Nebraska flood-control reservoirs from 2000 to 2004 that were stocked with walleye <em>Sander vitreus </em>and experienced weather-related extirpations of gizzard shad <em>Dorosoma cepedianum</em>. Gizzard shad dominated the larval fish assemblages with a wide-ranging length distribution prior to extirpation. After extirpation, Centrarchidae species eventually filled the void with a smaller and truncated length-frequency distribution. Larval fish densities varied widely throughout the study period with fewer prey available to predators with gizzard shad present in the assemblages. The extirpation of gizzard shad elicited a significant change to the larval fish assemblages of these reservoirs but did not prohibit the survival of stocked walleye fingerlings.

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