scholarly journals Food Spectrum, Trophic and Length-Weight Characteristics of Nonindigenous Suckermouth Armored Catfishes Pterygoplichthys spp. (Loricariidae) in Vietnam

2021 ◽  
Vol 14 (5) ◽  
pp. 597-605
Author(s):  
I. A. Stolbunov ◽  
V. A. Gusakov ◽  
Tran Duc Dien ◽  
Nguyen Thi Hai Thanh
Keyword(s):  
Invasive Species ◽  
Fish Species ◽  
Inland Waters ◽  
South American ◽  
Food Spectrum ◽  
Organic Detritus ◽  
Animal Food ◽  
High Consumption ◽  
Predominant Type ◽  
Food Competitor

Abstract The food spectrum and trophic and length–weight characteristics of an invasive species, South American suckermouth armored catfishes Pterygoplichthys spp. (Loricariidae), from lotic and lentic inland waters of Vietnam have been studied. It is found that the diet of suckermouth armored catfishes consists of plant and animal food, as well as organic detritus. According to the predominant type and pattern of feeding, suckermouth armored catfishes can be classified as detritivore gatherers (janitor). Some specimens of catfish with a high consumption of animal food have been identified. It is noted that invasive suckermouth armored catfishes can be a significant food competitor for aboriginal fish species; detritivores; and, possibly, benthophages in the lotic and lentic inland waters of Vietnam.

The issue of assessment of efficiency of works on land reclamation fisheries in inland waters of Russia

2021 ◽  
pp. 8-20
Author(s):  
Andrey Dmitrievich Bykov ◽  
Svetlana Yuryevna Brazhnik
Keyword(s):  
Fish Species ◽  
Land Reclamation ◽  
Long Term Results ◽  
Predatory Fish ◽  
Federal State ◽  
Inland Waters ◽  
Ecological Group ◽  
Spawning Grounds ◽  
Commercial Fish

The article considers the issue of assessing the long-term results of work on fisheries reclamation in inland waters of fisheries significance in Russia, carried out by the branches of the Federal State Budgetary Institution “Glavrybvod” on the state task in terms of their effectiveness. The relationship between dredging and clearing of watercourse beds and the dynamics of the number of producers of semi-navigable and non-aquatic fish in these rivers during spawning migrations has not been established. With long-term mowing of wetland vegetation in the shallow waters of reservoirs, deltas of large rivers and estuaries, there is no increase in their commercial fish productivity. A number of examples show the opposite effect of this type of work, which leads to a local deterioration of the ecological state of these reservoirs. At the same time, the repeatedly proven method of combating higher aquatic vegetation in the reservoirs of the south of Russia in low water conditions as biomelioration, based on the introduction of fish, consumers of autotrophic products by regional branches of the Federal State Budgetary Institution “Glavrybvod” is practically not used. When installing artificial spawning grounds in the littoral zone of reservoirs, regular ichthyological monitoring of the effectiveness of spawning on them is not carried out. There are no reliable data confirming the significant positive impact of artificial spawning grounds on the population dynamics of commercial fish species of the limnophilic ecological group under conditions of significant spring water level depletion in Russian reservoirs. When catching predatory and low-value fish species in water bodies, legal obstacles arise due to the fact that the volume of seizure of predatory fish includes commercial objects for which the ODE is established annually and their catch is already carried out according to industrial quotas.

scholarly journals Cryopreservation of Embryos and Oocytes of South American Fish Species

10.5772/58703 ◽  
2014 ◽  
Author(s):  
Danilo Pedro Streit ◽  
Leandro Cesar de Godoy ◽  
Ricardo Pereira Ribeiro ◽  
Darci Carlos Fornari ◽  
Melanie Digmayer ◽  
...  
Keyword(s):  
Fish Species ◽  
South American

scholarly journals DNA Fingnerprinting of Eight Cyprinid Fish Species of Iraqi Inland Waters Using RAPD-PCR Technique

2012 ◽  
Vol 2 (2) ◽  
pp. 9-16
Author(s):  
Mustafa Sami Faddagh ◽  
Najah A. Hussain ◽  
Adnan Issa Al-Badran
Keyword(s):  
Fish Species ◽  
Cyprinid Fish ◽  
Inland Waters ◽  
Rapd Pcr

scholarly journals DDRT-PCR approaches applied for preeminent results in the isolation of DETs from fish brain tissues

2015 ◽  
Vol 75 (1) ◽  
pp. 224-228
Author(s):  
FA. Alves-Costa ◽  
AP. Wasko
Keyword(s):  
Fish Species ◽  
Tandem Repeats ◽  
Variable Number ◽  
Differentially Expressed ◽  
South American ◽  
Adult Males ◽  
South American Species ◽  
Commercial Species ◽  
Pcr Method ◽  
Males And Females

Differential Display (DD) is a technique widely used in studies of differential expression. Most of these analyses, especially those involving fish species, are restricted to species from North America and Europe or to commercial species, as salmonids. Studies related to South American fish species are underexplored. Thus, the present work aimed to describe DD technique modifications in order to improve outcomes related to the isolation of DETs (Differentially Expressed Transcripts), using Leporinus macrocephalus, a large commercially exploited South American species, as a fish design. Different DDRT-PCR approaches were applied to brain samples and the products of the reactions were analyzed on 6% polyacrylamide gels stained with 0.17% Silver Nitrate (AgNO3). The use of PCR reactions under high stringency conditions and longer oligonucleotides based on VNTR (Variable Number of Tandem Repeats) core sequences led to better results when compared to low stringency PCR conditions and the use of decamer oligonucleotides. The improved approach led to the isolation of differentially expressed transcripts on adult males and females of L. macrocephalus. This study indicates that some modifications on the DDRT-PCR method can ensure isolation of DETs from different fish tissues and the development of robust data related to this approach.

scholarly journals Ontogeny of Adenohypophyseal Cells, Pituitary Gland Development and Structure in Adults of Astyanax Lacustris (Teleostei, Characidae): an Emerging Neotropical Fish Species

2021 ◽  
Author(s):  
Giovana Souza Branco ◽  
Lázaro Wender O. De Jesus ◽  
Monica Cassel ◽  
Chayrra Chehade ◽  
Marília de Paiva Camargo ◽  
...  
Keyword(s):  
Pituitary Gland ◽  
Early Development ◽  
Fish Species ◽  
Cell Types ◽  
South American ◽  
Neotropical Fish ◽  
Future Studies ◽  
Commercial Importance ◽  
Gland Morphogenesis ◽  
Gland Development

Abstract Pituitary gland morphogenesis of the adenohypophyseal (AH) cells of Astyanax lacustris are presented herein. This Characiformes species show great ecological and commercial importance, and it has been increasingly used as a biological model. The first AH cells of A. lacustris were detected at 1 dah by the immunostaining of PRL producing cells. The morphology of the gland presented changes in shape throughout the development, starting elongated but more oval at the end. The neurohypophysis was differentiated at 3 dah, along with the identification of ACTH, MSH, TSH, and FSH producing cells. Identification of the immunoreactive cells to anti-LH, anti-SL, and anti-GH antibodies occurred at 5 dah. At 20 dah, an increase in pituitary size and the presence of the pituitary stalk were observed. At 60 dah, the pituitary already had the same shape seen in adults. The ontogeny of adenohypophyseal cells in A. lacustris corroborates the heterogeneity in the appearance of these cell types in teleosts and suggests that these hormones actively participate during the early development of this species. Our results collaborate with the understanding of the morphogenesis of the hypothalamic-pituitary-gonadal axis in South American teleosts, showing essential data for the development of future studies related to pituitary morphophysiology.

scholarly journals Delivering Food to Hungry Fish in the San Francisco Estuary

2021 ◽  
Vol 9 ◽  
Author(s):  
Laura Twardochleb ◽  
Leela Dixit ◽  
Mallory Bedwell ◽  
Brittany Davis ◽  
Jared Frantzich
Keyword(s):  
Invasive Species ◽  
San Francisco ◽  
Fish Species ◽  
San Francisco Estuary ◽  
Fish Food ◽  
Yolo Bypass ◽  
Delta Smelt ◽  
Endangered Fish ◽  
The Past

The San Francisco Estuary is home to an important endangered fish called delta smelt. Delta smelt eat small, nutritious animals called zooplankton to survive and grow. In turn, zooplankton grow by eating microscopic plant-like organisms called phytoplankton. In the past, the Estuary was full of plankton and delta smelt. Because people have removed water from the Estuary and invasive species now live there, the Estuary no longer has enough plankton to feed delta smelt, making it difficult for them to survive. Scientists have found a unique place in the Estuary, the Yolo Bypass, that has lots of fish food. The problem is that delta smelt do not live in the Yolo Bypass year-round. Scientists are working to solve this problem by sending river or farm water through the Yolo Bypass, to move fish food downstream to feed the hungry delta smelt and other fish species.

scholarly journals Indigenous versus Lessepsian Hosts: Nervous Necrosis Virus (NNV) in Eastern Mediterranean Sea Fish

Viruses ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 430 ◽  
Author(s):  
Yael Lampert ◽  
Ran Berzak ◽  
Nadav Davidovich ◽  
Arik Diamant ◽  
Nir Stern ◽  
...  
Keyword(s):  
Invasive Species ◽  
Mediterranean Sea ◽  
Marine Environment ◽  
Fish Species ◽  
Eastern Mediterranean ◽  
Nervous Necrosis Virus ◽  
Indigenous Species ◽  
Necrosis Virus ◽  
Marine Aquaculture ◽  
The Mediterranean

Viruses are among the most abundant and diverse biological components in the marine environment. In finfish, viruses are key drivers of host diversity and population dynamics, and therefore, their effect on the marine environment is far-reaching. Viral encephalopathy and retinopathy (VER) is a disease caused by the marine nervous necrosis virus (NNV), which is recognized as one of the main infectious threats for marine aquaculture worldwide. For over 140 years, the Suez Canal has acted as a conduit for the invasion of Red Sea marine species into the Mediterranean Sea. In 2016–2017, we evaluated the prevalence of NNV in two indigenous Mediterranean species, the round sardinella (Sardinella aurita) and the white steenbras (Lithognathus mormyrus) versus two Lessepsian species, the Randall’s threadfin bream (Nemipterus randalli) and the Lessepsian lizardfish (Saurida lessepsianus). A molecular method was used to detect NNV in all four fish species tested. In N. randalli, a relatively newly established invasive species in the Mediterranean Sea, the prevalence was significantly higher than in both indigenous species. In S. lessepsianus, prevalence varied considerably between years. While the factors that influence the effective establishment of invasive species are poorly understood, we suggest that the susceptibility of a given invasive fish species to locally acquired viral pathogens such as NVV may be important, in terms of both its successful establishment in its newly adopted environment and its role as a reservoir ‘host’ in the new area.

Freshwater lampreys and fishes of Turkey; a revised and updated annotated checklist 2020

Zootaxa ◽  
2020 ◽  
Vol 4809 (2) ◽  
pp. 241-270 ◽  
Author(s):  
ERDOGAN ÇIÇEK ◽  
SEVIL SUNGUR ◽  
RONALD FRICKE
Keyword(s):  
Fish Species ◽  
Freshwater Fishes ◽  
Current Status ◽  
Inland Waters ◽  
Annotated Checklist

The current status of the inland waters ichthyofauna of Turkey is revised, and an updated checklist of the freshwater fishes is presented. The latest checklist included all species listed in the available previous study that was published in 2015, which is now updated after a period of five years. We revised the validity of previously accepted species and added newly described and reported species in Turkey. Some previously erroneously reported species and not established alien fishes were excluded from this checklist. A total of 384 fish species belonging to 20 orders and 34 families have been reported in the inland waters of Turkey. Among these, 15 species (3.9%) are non-native and 208 species (54.2%) are considered as endemic to Turkey. A total of 119 species previously reported from Turkey have been excluded from Turkish ichthyofauna list, either in the present study or in previous studies.

Halotolerant Copepoda in South American inland saline waters

Crustaceana ◽  
2018 ◽  
Vol 91 (5) ◽  
pp. 527-535 ◽  
Author(s):  
Patricio De los Ríos ◽  
Ian A. E. Bayly
Keyword(s):  
Literature Review ◽  
Shallow Lakes ◽  
Copepod Species ◽  
Salinity Range ◽  
Inland Waters ◽  
South American ◽  
The South ◽  
Saline Waters ◽  
Shallow Ponds

Abstract The zooplankton in South American saline waters is mainly dominated by copepods at salinities lower than 90 g/l, whereas at salinities above 90 g/l Artemia sp. is totally dominant. The aim of the present study is to analyse the salinity range of halophilic copepods on the basis of a literature review for South American saline inland waters. The calanoid Boeckella poopoensis Marsh, 1906, is widespread on the South American Altiplano and southern Argentinian plains, and in southern Patagonian shallow ponds. In the upper part of the salinity range, 20-90 g/l, B. poopoensis is the only copepod in the zooplankton of southern Patagonian and Altiplano shallow lakes. In the salinity range 5-20 g/l B. poopoensis may co-exist with B. palustris (Harding, 1955), two cyclopoids and an harpacticoid, and at salinities lower than 5 g/l it may co-exist with an even wider range of copepod species. Ecological and biogeographical aspects are also discussed.

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