Ichthyoplankton Species Composition and Assemblages From the Estuary to the Hukou Section of the Changjiang River

Estuary river–lake (ERL) complex is critical for the development of ichthyoplankton, which plays an essential role in the breeding, nursing, and recruitment of freshwater fish species. In this study, different ERL sections were selected to investigate the ichthyoplankton assemblage from the Changjiang River estuary to its Hukou section between May 2018 and August 2020. During the study period, fish larvae of 40, 35, 54, and 46 fish species were sampled in the Rugao (RG), Nanjing (NJ) (nearby estuary), Anqing (AQ), and Hukou (HK) (connected river–lake) sections in the Changjiang River, respectively. Results on ichthyoplankton surveys revealed fluctuating assemblage patterns in the different river sections; larval fish species composition presented ecological habitat-dependent characteristics, which supported the importance of ERL complex for ichthyoplankton development. Furthermore, the density of fish larvae was negatively correlated with water transparency but positively correlated with water temperature, the daily rate of water level increase, and runoff in the limitative range. A generalized additive model analysis indicated that the hydrological factors significantly affecting larval fish abundance are water temperature, transparency, the daily rate of water level increase, and runoff (p < 0.05). These results also indicated that river estuaries and river–lake connected complexes are essential for ichthyoplankton recruitment and migration. In combination with the historical record, ichthyoplankton assemblage’s patterns in the Changjiang River lower reaches were preliminarily elucidated, although additional works are needed such as assessing effects on their survival and recruitment.

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Modelling seasonal patterns of larval fish parasitism in two northern nearshore areas in the Humboldt Current System

Scientific Reports ◽

10.1038/s41598-020-79847-1 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Lissette D. Paredes ◽

Mauricio F. Landaeta ◽

Carlos Molinet ◽

M. Teresa González

Keyword(s):

Fish Species ◽

Seasonal Variations ◽

Larval Fish ◽

Fish Larvae ◽

Current System ◽

Gamma Model ◽

Austral Spring ◽

Humboldt Current ◽

Humboldt Current System ◽

Reproductive Processes

AbstractMacro- and micro-environmental factors modulate parasite loads in fish, determining parasitic abundances, diversity, and interaction dynamics. In this study, seasonal variations in larval ectoparasites on fish larvae in the northern Humboldt Current System (HCS) were evaluated using a delta-gamma generalized linear model to predict their occurrence frequencies. Fish larvae were collected from two nearshore areas during austral spring–summer and autumn–winter. Only five (of 38) larval fish species were parasitized by copepods: Gobiesox marmoratus, Ophiogobius jenynsi, Helcogrammoides cunninghami, Myxodes sp., and Auchenionchus crinitus. A binomial model showed that the presence/absence of parasitized fish larvae varied among the fish species and their larval abundances, while a positive delta-gamma model showed that ectoparasite frequency varied among the seasons and fish species. Seasonal variations in parasitized fish larvae frequency could be associated with host and parasite reproductive processes, which are related to oceanographic features responsible for larval retention and subsequent higher infestation probabilities. Host length was positively correlated with ectoparasite length, suggesting early infection and combined growth until the detachment of the ectoparasite. Our results suggest that infestation patterns in larval fish species can be identified using delta-gamma models and that they respond to local (retention) and high-scale (HCS) processes.

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CHANGES IN SPECIES COMPOSITION AND ABUNDANCE OF FISH LARVAE FROM THE GULF OF TEHUANTEPEC, MEXICO

CICIMAR Oceánides ◽

10.37543/oceanides.v27i2.112 ◽

2012 ◽

Vol 27 (2) ◽

pp. 1

Author(s):

O. López -Chávez ◽

G. Aceves -Medina ◽

R. J. Saldierna -Martínez ◽

S. P. Jiménez -Rosenberg ◽

J. P. Murad -Serrano ◽

...

Keyword(s):

Species Composition ◽

Gulf Of California ◽

Larval Fish ◽

Fish Larvae ◽

Species Level ◽

Unusual Condition ◽

Gulf Of Tehuantepec ◽

Demersal Species ◽

High Diversity ◽

Mesopelagic Species

The larval fish abundance and species composition of the Gulf of Tehuantepec are described based on the analysis of samples obtained from oblique zooplankton tows during summer 2007 and spring 2008. Changes in species composition and abundance between both periods were also described. A total of 145 taxa were obtained from which 73 were identified to species level, 43 to genus and 29 to family. The larval fish assemblage of the Gulf of Tehuantepec showed distinctive characteristics from other regions of the American Pacific, such as: A) a dominance of coastal-pelagic species (mainly Bregmaceros bathymaster); B) high diversity and abundance of shallow demersal species even along the oceanic stations of the study area; and C) a low proportion of mesopelagic species, an unusual condition in areas with narrow continental shelf. The diversity estimations suggest that Gulf of Tehuantepec is one of the most diverse ecosystems of the American Pacific, even as compared with other regions considered of highest diversity such as the Gulf of California. The high abundance, as well as the presence of the larval, juvenile and adult stages of B. bathymaster, suggests the importance of this region as a reproductive, nursery and recruitment for this species. Cambios en la composición de especies y abundancia de larvas de peces en el Golfo de Tehuantepec, México Se describen la composición de especies y abundancia de larvas de peces del Golfo de Tehuantepec a partir del análisis de muestras obtenidas en arrastres oblicuos de zooplancton. Así mismo, se describen los cambios en composición y abundancia entre un periodo de verano y uno de primavera. Se obtuvieron 145 taxa de los que 73 se identificaron a nivel especie, 43 a género y 29 a familia. La comunidad de larvas de peces del Golfo de Tehuantepec mostró rasgos distintivos de otras regiones similares del Pacífico Americano, tales como: A) dominancia de especies pelágico-costeras (particularmente Bregmaceros bathymaster); B) alta diversidad y abundancia de especies demersales someras aún en las estaciones mas oceánicas del área de estudio; y C) una proporción menor de especies de peces mesopelágicos, condición poco común en áreas con plataforma continental estrecha. Las estimaciones de diversidad ubican al Golfo de Tehuantepec como uno de los ecosistemas más diversos del Pacífico americano, aún comparándolo con regiones consideradas de alta diversidad a nivel mundial como es el caso del Golfo de California. La abundancia y la presencia de estadios larvales, juveniles y adultos de B. bathymaster reflejan la importancia de esta zona como área de reproducción, crianza y reclutamiento de esta especie.

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Impacts of variability of habitat factors on species composition of ichthyoplankton and distribution of fish spawning ground in the Changjiang River estuary and its adjacent waters

Acta Ecologica Sinica ◽

10.1016/j.chnaes.2010.04.006 ◽

2010 ◽

Vol 30 (3) ◽

pp. 155-165 ◽

Cited By ~ 10

Author(s):

Wan Ruijing ◽

Zhou Feng ◽

Shan Xiujuan ◽

Sun Shan

Keyword(s):

Species Composition ◽

River Estuary ◽

Spawning Ground ◽

Changjiang River ◽

Changjiang River Estuary ◽

The Changjiang River ◽

Habitat Factors ◽

The Changjiang River Estuary ◽

Fish Spawning ◽

Distribution Of Fish

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Variations in the contribution of transport to changes in planktonic animal abundance: a study of the flux of fish larvae in Conception Bay, Newfoundland

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f95-142 ◽

1995 ◽

Vol 52 (7) ◽

pp. 1475-1486 ◽

Cited By ~ 28

Author(s):

P. Pepin ◽

J. A. Helbig ◽

R. Laprise ◽

E. Colbourne ◽

T. H. Shears

Keyword(s):

Larval Fish ◽

Fish Larvae ◽

Estimation Error ◽

Mortality Rates ◽

Rate Of Change ◽

Short Term ◽

Physical Forcing ◽

Daily Rate ◽

Conception Bay ◽

And Diffusion

We investigated the magnitude of short-term variations in the flux of several species of fish larvae in Conception Bay, Newfoundland, determined the contribution of these fluxes to changes in the abundance of these species, and assessed the factors that may be causing the variations in these fluxes. The net effect of transport ranged from a daily influx of 5.8% to a daily efflux of 6.2% from the population. Short-term variations in transport were associated with variations in wind stress. The contribution of transport to variations in population abundance ranged from 12 to more than 75% of the average daily rate of change in numbers for the different species. The contribution of physical processes to estimated mortality rates is variable and can have a significant impact on the investigation and interpretation of potential biological processes (e.g., predation and starvation) influencing the survival of larval fish. We predicted that the average correction to the instantaneous mortality rate due to advection and diffusion should be proportional to A−1/2, where A is the area of system under study. This highlights the susceptibility of small systems to estimation error of mortality rates caused by short-term variations in physical forcing.

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Species composition, horizontal distribution and seasonal succession of phytoplankton in the Channel from Dongting Lake to the Changjiang River, China

Chinese Journal of Oceanology and Limnology ◽

10.1007/bf02849651 ◽

2002 ◽

Vol 20 (2) ◽

pp. 142-148 ◽

Cited By ~ 3

Author(s):

Wei Yin-xin

Keyword(s):

Species Composition ◽

Seasonal Succession ◽

Horizontal Distribution ◽

Dongting Lake ◽

Changjiang River ◽

The Changjiang River

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Early Life History of Fishes in the San Francisco Estuary and Watershed

Early Life History of Fishes in the San Francisco Estuary and Watershed ◽

10.47886/9781888569599.ch5 ◽

2004 ◽

Keyword(s):

Water Temperature ◽

Alien Species ◽

Native Species ◽

River Flow ◽

Larval Fish ◽

Environmental Gradients ◽

Fish Larvae ◽

Early Summer ◽

Highly Correlated ◽

Threadfin Shad

Abstract.—Fish larvae were sampled at multiple fixed sites from late winter to early summer over 6 years (1990–1995) in the southern Sacramento–San Joaquin Delta. A total of 394,797 fish larvae representing 15 species or taxonomic groups was collected. The assemblage was numerically dominated by three species that represented 98% of the total catch: alien shimofuri goby Tridentiger bifasciatus (71%), threadfin shad Dorosoma petenense (15%), and native prickly sculpin Cottus asper (12%). The abundance of native and alien species differentially clustered along environmental gradients of water temperature and river flow. Each native species (prickly sculpin, splittail Pogonichthys macrolepidotus, delta smelt Hypomesus transpacificus, longfin smelt Spirinchus thaleichthys, and Sacramento sucker Catostomus occidentalis) and one alien species (bigscale logperch Percina macrolepida) were associated with the early season conditions of cool water temperature and high river flow. Alien species (especially shimofuri goby, threadfin shad, and ictalurid catfishes) were associated with late season conditions of relatively warm water temperature and low river flow. Accordingly, native species dominated the assemblage February–March, while alien species dominated May–July. However, peak seasonal abundance of alien species was typically five times greater than that of native species. Seasonal succession of assemblage structure was persistent among years and was highly correlated with water temperature, a likely result of the differential spawning requirements of adult fishes. Interannually, the assemblage remained consistent over the study period despite considerable variability in delta inflow. I hypothesize, given the consistent temporal segregation between native and alien larval fish assemblages, that direct interactions such as competition between the two groups may not be a major factor influencing poor native fish recruitment in the south delta.

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Larval fish assemblage patterns in three tributaries of Mekong River in Thailand

Indian Journal of Fisheries ◽

10.21077/ijf.2018.65.2.75121-01 ◽

2018 ◽

Vol 65 ◽

Author(s):

Pisit Phomikong ◽

Suriya Udduang ◽

Michio Fukushima ◽

Boonsong Srichareondham ◽

Deeka Rattanachamnong ◽

...

Keyword(s):

Fish Species ◽

Larval Fish ◽

Fish Larvae ◽

River System ◽

Mekong River ◽

Fish Diversity ◽

Wet Season ◽

Fish Ladder ◽

Study Sites ◽

Songkhram River

The assemblage patterns of larval fishes from three neighboring tributaries viz., Songkram, Gam and Mun of the Mekong River in Thailand were investigated between August 2009 and June 2010. These rivers interact with their floodplains, which are important spawning and nursery grounds for the Mekong fishes. There is no dam along the Songkram River; meanwhile the Gam River has several irrigation dams with a fish ladder at each dam site and the Mun River has a hydropower dam with a fish ladder and sluice gates that are opened during the wet season each year. A total of 97 fish species were collected from the study sites. Assemblage of Gam River was dominated by larvae of resident, black fish species. Assemblage of Mun River during sluice gate opening scheme was similar to that of Songkram River during wet season. Assemblage during flood period of Songkhram River showed the most diversity and abundance of migratory, white fish larvae. Conservation of integrity of the floodplain-river system of Songkhram River is among the crucial strategies for sustaining fish diversity and fisheries in the Lower Mekong River Basin.

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Linking fish and crustacean taxonomic composition with seasonal contrasts in the soft-bottom intertidal zone

Brazilian Journal of Biology ◽

10.1590/1519-6984.234129 ◽

2020 ◽

Author(s):

M. A. Gondal ◽

S. Iqbal ◽

U. Atique ◽

N. U. Saher ◽

N. A. Qureshi ◽

...

Keyword(s):

Species Richness ◽

Water Temperature ◽

Fish Species ◽

Diversity Index ◽

Taxonomic Composition ◽

Primary Objective ◽

Negative Effect ◽

Fish Species Composition ◽

One Year ◽

Sw Monsoon

Abstract The primary objective of this study was to investigate the seasonal fish and crustacean variations concerning taxonomic composition, species richness, and diversity in sandy beach habitat. For this purpose, we investigated the Sonmiani Hor lagoon area during four distinct seasons, i.e., northeast (NE) monsoon, pre-monsoon, south-west (SW) monsoon, and post-monsoon for one year. During each haul, the net was pulled about 100m along the beach in 0.5m depth. The results showed a strong linear correlation between the diversity index and equitability in fishes (r = 0.978). The diversity index was strong negatively correlated with the abundance and biomass (r = -0.978, -0.972, respectively). The physical attributes like sea surface water temperature and salinity showed a strong negative effect on species assemblages (r = -0.981 and -0.943, respectively). The mean air and water temperature illustrated approximately 3°C difference during NE and pre-monsoon seasons. However, salinity, pH, and electrical conductivity did not show any significant seasonal variabilities. Under the ecological indices, the fish species displayed higher diversity (H’ = 3.19) during SW monsoon, whereas the lowest diversity was observed during pre-monsoon (H’ = 1.58). The equitability and species richness, however, remained more noticeable during SW monsoon (J’ = 0.81). The total number of individuals of fish and crustaceans reached 4799 with 3813 fish individuals and 986 individuals of crustaceans. A total of 27 families of fish while five crustacean families comprising of 30 genera and 38 fish species while ten genera and 17 species of crustaceans were recorded. Liza subviridis displayed the highest abundance among the sampled fish species. In conclusion, fish species constituted a significant part of the coastal fauna in the study area. The seasonal variations displayed distinct variations in fish species composition and diversity.

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