Population parameters of main fishery resources in the basin of the  Apure River, Venezuela (2000-2003)

Population parameters, performance index (∅) and exploitation rates (E = F/Z), of the 14 most important commercial fish species, in the Apure River, were estimated from length frequency distributions of commercial catches in the period 2000-2003. Growth parameters were used to determine the status of the principal fisheries resources of the Apure River. The analyzed species represented 83% of the total commercial species. The results showed a predominance of values relativity low of K and high L∞, common in longevity species. This data combined with the high values from estimations of Z and F showed a survival annual high rate and low stock tuner-over rate. The E estimations for the 14 fish species were high. E0,1 (0.50- 0.94). The overfishing indicators to four most fish species abundant (P. mariae, P. tigrinum, M. duriventre y H. littorale), showed that at least three species were heavy exploited. In general the analysis indicate that these 14 fish species have been strongly fished, and the data obtained is a starting point (as biological reference point) to be used for the assessment and management of fisheries resources in the Apure River.

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Conservation-Status Gaps for Marine Top-Fished Commercial Species

Fishes ◽

10.3390/fishes7010002 ◽

2021 ◽

Vol 7 (1) ◽

pp. 2

Author(s):

Imanol Miqueleiz ◽

Rafael Miranda ◽

Arturo Hugo Ariño ◽

Elena Ojea

Keyword(s):

Fish Species ◽

Conservation Status ◽

Species Conservation ◽

Biodiversity Loss ◽

Vulnerability Index ◽

Iucn Red List ◽

Red List ◽

Commercial Fish ◽

Commercial Species ◽

Marine Realm

Biodiversity loss is a global problem, accelerated by human-induced pressures. In the marine realm, one of the major threats to species conservation, together with climate change, is overfishing. In this context, having information on the conservation status of target commercial marine fish species becomes crucial for assuring safe standards. We put together fisheries statistics from the FAO, the IUCN Red List, FishBase, and RAM Legacy databases to understand to what extent top commercial species’ conservation status has been assessed. Levels of assessment for top-fished species were higher than those for general commercial or highly commercial species, but almost half of the species have outdated assessments. We found no relation between IUCN Red List traits and FishBase Vulnerability Index, depreciating the latter value as a guidance for extinction threat. The RAM database suggests good management of more-threatened species in recent decades, but more data are required to assess whether the trend has reverted in recent years. Outdated IUCN Red List assessments can benefit from reputed stock assessments for new reassessments. The future of IUCN Red List evaluations for commercial fish species relies on integrating new parameters from fisheries sources and improved collaboration with fisheries stakeholders and managers.

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Assemblage, Abundance and Diversity of Fish Species in River Dhaleshwari, Bangladesh

Asian Journal of Fisheries and Aquatic Research ◽

10.9734/ajfar/2018/v2i126112 ◽

2018 ◽

pp. 1-28

Author(s):

Mehady Islam ◽

Rumana Yasmin

Keyword(s):

Fish Species ◽

Fish Habitat ◽

Ecological Condition ◽

Shannon Index ◽

Management Approach ◽

Main Stream ◽

Fisheries Resources ◽

Fish Biodiversity ◽

Starting Point ◽

Fish Species Composition

Biodiversity in realism is a measure of the adherents of species that characterize a biological community and thought to be one of the extremely imperative aspects of community establishment and structure. The study regarding the fish biodiversity is very much needed as it is directly related to the fisheries resource structure and also contributes significantly towards resource richness. Therefore the present study was performed to evaluate the concurrent fish species composition, abundance and some major fish biodiversity indices of the River Dhaleshwari of Bangladesh. The study area was about 564.20 ha and 20 kilometers long along the main stream of the river Dhaleshwari. The starting point was the Tulshikhali bridge, Keranigonj and the end point was Balur char, Munshigonj. The geographical locations of the sampling stations were between 90̊ 17ʹ E to 90̊ 25ʹ E and 23º 40´ N to 23º 37´ N. The study was conducted between August’2015 and October’2016.The fish species diversity showed spatial variation among the sampling stations. The biodiversity appraisal validates Shannon index (0.122-0.634) with highest value in Balur char and lowest in Pathor ghata; Simpson’s index (0.325-0.893) with utmost valuation for the Pathor ghata and lowermost for Balur char; Pielou’s evenness index (0.117-0.588) with maximum value for the Balur char and least for Pathor ghata; Margaleff index (4.793-7.438) with uppermost value for the Balur char and minimum in Tulshikhali; topmost abundance of fish was recorded from Tulshikhali and least for Balur char and maximum number of unique species was recorded for Tulshikhali and minimum from Balur char. Moreover, the current study correspondingly has ascertained the pragmatism and efficacy of biodiversity assessment to scrutinize and epitomize fisheries resources for better management of the river Dhaleshwari. Effective management approach should be applied for precisely maintaining the fish habitat health and ecological condition intact before it’s too late.

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Indicator-based status assessment of commercial fish species in the North Sea according to the EU Marine Strategy Framework Directive (MSFD)

ICES Journal of Marine Science ◽

10.1093/icesjms/fst010 ◽

2013 ◽

Vol 70 (3) ◽

pp. 694-706 ◽

Cited By ~ 23

Author(s):

Wolfgang Nikolaus Probst ◽

Matthias Kloppmann ◽

Gerd Kraus

Keyword(s):

North Sea ◽

Fish Species ◽

Marine Strategy Framework Directive ◽

Commercial Fish ◽

Fish Stocks ◽

The North ◽

The Status ◽

Status Assessment ◽

The North Sea ◽

The Eu

Abstract Probst, W. N., Kloppmann, M., and Kraus, G. Indicator-based status assessment of commercial fish species in the North Sea according to the EU Marine Strategy Framework Directive (MSFD). – ICES Journal of Marine Science, 70: 694–706. The EU Marine Strategy Framework Directive (MSFD) is structured into eleven descriptors of good environmental status (GES). For each descriptor the current status of the marine environment should be assessed against its GES using ecosystem criteria and indicators. Within Descriptor 3 (D3) the MSFD addresses the status of exploited fish stocks according to three criteria (exploitation rate, stock size and size structure). This study performed an MSFD-compliant assessment of exploited fish stocks in the North Sea by aggregating data from analytical stock assessments and scientific research surveys to calculate indicator metrics for each criterion within each stock time-series. A stock achieved GES, when each indicator for each criterion had a good status. Of 43 assessed fish stock suggested by the EU Data Collection Framework, 63% (27) achieved GES. Though the MSFD explicitly demands that all exploited fish stocks achieve GES, this demand may be challenged by reality, because the status of exploited stocks depends not only on fishing impacts, but also on environmental conditions and ecological interactions. Therefore an alternative approach based on binomial distributions is presented to define limits for GES at the descriptor level. The implications and pitfalls of the applied assessment methods are discussed.

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Population parameters and size at maturity of Callinectes arcuatus Ordway, 1863 (Decapoda, Portunidae) in Apozahualco Lagoon, Guerrero, Mexico

Crustaceana ◽

10.1163/15685403-00003872 ◽

2019 ◽

Vol 92 (4) ◽

pp. 397-414

Author(s):

Jesús G. Padilla-Serrato ◽

J. Gabriel Kuk-Dzul ◽

Pedro Flores-Rodríguez ◽

Rafael Flores-Garza ◽

Nader Soriano-Reyes

Keyword(s):

Coastal Lagoon ◽

Performance Index ◽

Gulf Of California ◽

Fishery Management ◽

Size Structure ◽

Growth Parameters ◽

Size At Maturity ◽

Population Parameters ◽

Mexican Pacific ◽

Frequency Distributions

Abstract The objectives of this study were, to determine the population parameters of size structure, growth, cohorts, and recruitment for Callinectes arcuatus Ordway, 1863, as well as the size at maturity for females. We sampled each fortnight from September 2008 to February 2009 in the coastal lagoon Apozahualco, Guerrero, Mexico. Analysis of size frequency distributions showed three (September) and four (December) cohorts of juveniles. Estimated growth parameters were and , and the phi-prime growth performance index () was 4.2. Recruitment had the highest values during August and September. The size at maturity for females was 72 mm. In conclusion, values of for C. arcuatus were higher in the southern Mexican Pacific (SMP) than in the Gulf of California (GC); and this size at maturity for females followed a decreasing pattern from SMP to GC. These results are essential for fishery management of C. arcuatus in the SMP and GC.

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Plastic Occurrence in Commercial Fish Species of the Black Sea

Turkish Journal of Fisheries and Aquatic Sciences ◽

10.4194/trjfas20504 ◽

2021 ◽

Vol 22 (Special Issue) ◽

Author(s):

Ulgen Aytan ◽

Fatma Basak Esensoy ◽

Yasemen Senturk ◽

Esra Arifoglu ◽

Kaan Karaoglu ◽

...

Keyword(s):

Black Sea ◽

Fish Species ◽

The Black Sea ◽

Plastic Pollution ◽

Commercial Fish ◽

Vital Functions ◽

The Status ◽

The Mean ◽

Merlangius Merlangus ◽

Sarda Sarda

The occurrence of micro- (<5 mm), meso- (5–25 mm) and macroplastics (>25mm) was investigated in seven commercial fish species of the Black Sea. Plastics were found in gastrointestinal track of all species analysed: Engraulis encrasicolus, Trachurus mediterraneus, Sarda sarda, Belone belone, Pomatus saltatrix, Merlangius merlangus and Mullus barbatus. A total of 352 plastic particles were removed from 190 individuals (29% of all individuals examined). The mean number of plastic particles per fish was 0.81±1.42 par.ind-1 (considering all fish analysed, n=650) and 2.06±1.09 par.ind-1 (considering only the fish that ingested plastic, n=190). The most common types of plastics were fibres (68.5%), followed by films (19%), fragments (11.9%), foams (0.3 %) and microbeads (0.3%). The most common plastic colour was black (39.3%) followed by blue (19.5%) and transparent (18.1%). The length of plastics ranged from 0.05 to 26.5 mm with an average of 1.84±2.80 mm. 93.2% of plastics were microplastics, 6.5 % as mesoplastics and 0.3% macroplastics. Plastic occurrence was higher in S. sarda (plastic in 70% of the analysed individuals) and lower in M. merlangus (plastic in 9% of the analysed individuals). The main synthetic polymers identified by Fourier-transform infrared (FTIR) spectroscopy were polypropylene (29.8%), polyester (17.5%), acrylic (15.8%), polyethylene (14%) and polystyrene (1.8%) and 21.1% of polymers were cellulosic. Results show that commercial fish of the Black Sea is contaminated by plastics. This might affect vital functions of fish and pose a risk to ecosystem and human health. The study contributes to a better understanding of the status of plastic pollution in the fish from different habitats of the Black Sea and provides baseline data to implement the Marine Strategy Framework Directive in the basin.

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A review of reproduction biology and spawning/ nursery grounds of the most important Adriatic commercial fish species in the last two decades

Acta Adriatica ◽

10.32582/aa.61.1.7 ◽

2020 ◽

Vol 61 (1) ◽

pp. 89-100 ◽

Cited By ~ 3

Author(s):

Barbara Zorica ◽

Ana Pešić ◽

Bojan Marčeta ◽

Milica Mandić ◽

Corrado Piccinetti ◽

...

Keyword(s):

Fish Species ◽

Scientific Knowledge ◽

Systematic Research ◽

Commercial Fish ◽

Nursery Grounds ◽

Good State ◽

Reproduction Biology ◽

The Status ◽

Scientific Platform

Recently, despite long-term systematic research of the Adriatic Sea ecosystem, the necessity to improve the existing protection of commercially exploited species occurred since the status of many renewable marine stocks were not in good state. In order to realize that review of scientific knowledge gather within the last two decades was required. In this paper emphasis has been placed on all the scientific knowledge concerning the reproductive biology, spawning and nursery grounds of four ecologically and economically important Adriatic fish species – sardine Sardina pilchardus, anchovy Engraulis encrasicolus, European hake Merluccius merluccius, Common pandora, Pagellus erythrinus. Main aim of this review was to establish new scientific platform that in near future should result with better conservation measures that will insure long-term sustainability of exploited marine living resources.

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Fatty Acid Composition and Levels of Selected Polyunsaturated Fatty Acids in Four Commercial Important Freshwater Fish Species from Lake Victoria, Tanzania

Journal of Lipids ◽

10.1155/2014/712134 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 6

Author(s):

Agnes Robert ◽

Prosper Mfilinge ◽

Samwel M. Limbu ◽

Chacha J. Mwita

Keyword(s):

Fatty Acids ◽

Polyunsaturated Fatty Acids ◽

Human Health ◽

Fish Species ◽

Lake Victoria ◽

Nile Perch ◽

Commercial Fish ◽

Tilapia Zillii ◽

Significant Difference ◽

Commercial Species

Fatty acids (FAs) particularlyω3 andω6 polyunsaturated fatty acids (PUFAs) play important role in human health. This study aimed to investigate the composition and levels of selectedω3 PUFAs in four commercial fish species, Nile perch (Lates niloticus), Nile tilapia (Oreochromis niloticus),Tilapia zillii, and dagaa (Rastrineobola argentea) from Mwanza Gulf in Lake Victoria. The results indicated that 36 types of FAs with different saturation levels were detected. These FAs were dominated by docosahexaenoic (DHA), eicosapentaenoic (EPA), docosapentaenoic (DPA), and eicosatetraenoic acids.O. niloticushad the highest composition of FAs (34) compared toL. niloticus(27),T. zillii(26), andR. argentea(21). The levels of EPA differed significantly among the four commercial fish species(F=6.19, P=0.001). The highest EPA levels were found inR. argenteafollowed byL. niloticusandO. niloticusand the lowest inT. zillii. The DPA levels showed no significant difference among the four fish species studied(F=0.652, P=0.583). The study concluded that all four commercial species collected from Mwanza Gulf are good for human health, butR. argenteais the best for consumption because it contains higher levels ofω3 FAs, mainly EPA.

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MODERN STATUS AND PROSPECTS OF ARTIFICIAL BREEDING OF RARE, EXTINCTING FISH SPECIES FOR CONSERVATION OF BIODIVERSITY AND RESTORATION OF ABUNDANCE IN NATURAL WATER RESERVES OF THE ILE-BALKHASH BASIN

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2019-3-17-30 ◽

2019 ◽

pp. 17-30

Author(s):

Maral Aydynkyzy Zhaparova ◽

Saule Zhangirovna Asylbekova ◽

Damir Kayirkeldyevich Zharkenov ◽

Kuanysh Baibulatovich Isbekov ◽

Vyacheslav Nickolaevich Tsoy

Keyword(s):

Fish Species ◽

Large Scale ◽

Irrigation System ◽

Food Competition ◽

Artificial Reproduction ◽

Commercial Fish ◽

Endangered Fish ◽

The Status ◽

Acipenser Nudiventris ◽

Rare And Endangered

This article presents materials on the current state of the native ichthyofauna of the Ile-Balkhash basin, affected by large-scale acclimatization works. Four species of the ichthyofauna composition are listed in the Red Book of Kazakhstan: spike ( Acipenser nudiventris Lovetsky, 1828), Aral barbel ( Barbus brachycephalus brachycephalus Kessler, 1872), Balkhash marinka ( Schizothorax argentatus argentatus Kessler, 1874), Balkhash perch ( Perca schrenkii Kessler, 1874). Due to the ineffectiveness of fish conservation measures, including the prohibition for catching of these fish species, which are not found anywhere except in the Ile-Balkhash basin, it is necessary to impose artificial reproduction, changes in the Fishery Rules and organization of commercial rearing. The work is based on research materials of 2001-2018 conducted in Lake Balkhash, the delta and the lower reaches of the Ile and the Tokraun. The status of spike populations ( Acipenser nudiventris Lovetsky, 1828), Aral barbel ( Barbus brachycephalus brachycephalus Kessler, 1872), Balkhash marinka ( Schizothorax argentatus argentatus Kessler, 1874) and Balkhash perch ( Perca schrenkii Kessler, 1874). The main reasons preventing the maintenance of a high number of endangered species have been established: small area of natural spawning grounds, death of fry in linmeshing fishing gear, large-scale poaching (spike); deterioration of conditions for the natural reproduction, mass mortality of young fishes in the irrigation system (Aral barbel); total elimination and food competition with pike perch (Balkhash marinka, Balkhash perch). The prospects for preservation of rare and endangered fish species have been considered, recommendations for breeding and replenishing populations of species listed in the Red Book have been given: measures for artificial reproduction and prevention of juvenile death, creating favorable conditions for fattening and reducing the pressure of trophic competition. Without taking adequate measures for reducing the anthropogenic impact on natural resources, including ichthyofauna, the number of main commercial fish species will decrease, rare species of fish will die out.

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Distribution of seagrasses, and their fish and penaeid prawn communities, in Cairns harbour, a tropical estuary, Northern Queensland, Australia

Marine and Freshwater Research ◽

10.1071/mf9930193 ◽

1993 ◽

Vol 44 (1) ◽

pp. 193 ◽

Cited By ~ 41

Author(s):

RG Coles ◽

WJ Lee Long ◽

RA Watson ◽

KJ Derbyshire

Keyword(s):

Fish Species ◽

Juvenile Fish ◽

Dry Weight ◽

Common Species ◽

Shoot Density ◽

Seagrass Beds ◽

Commercial Fish ◽

North Eastern ◽

Commercial Species ◽

Zostera Capricorni

From aerial photography (July 1987) and diving surveys (February 1988), 876 ha of seagrasses (eight species) were mapped in Cairns Harbour, tropical north-eastern Queensland. Zostera capricorni was the most common seagrass species and had the greatest biomass at 79 g m-2 dry weight of stems and leaves and 180 g m-2 dry weight of roots and rhizomes. The maximum shoot density found was 4798 shoots m-2 of Halodule pinifolia, the second most common species. Seagrasses were found only between 0.5 and 5.0 m below mean sea level. Zostera capricorni was found at the shallowest depths, Halodule pinifolia at the deepest depths. Twenty species of penaeid prawns, nine of which are marketed commercially, were sampled from the seagrass beds. Abundances of prawns of commercial species were significantly greater on seagrass-covered substrata than on nonvegetated substrata. Overall, 5614 mostly small or juvenile fish, representing 134 taxa, were sampled from seagrasses in Cairns Harbour. The most numerous fish species were a goby, Yongeichthys criniger, and a pony fish, Leiognathus splendens. Only 15 species were highly valued as recreational fish, and only 11 species were highly valued as commercial fish. Of the fish species, five (4%) were highly valued species of both groups. The density of fish on the seagrass beds was estimated to be 8809 fish ha-1.

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Gaining insights into the ecological role of the New Zealand sole (Peltorhamphus novaezeelandiae) through parasites

Journal of Helminthology ◽

10.1017/s0022149x17000323 ◽

2017 ◽

Vol 92 (2) ◽

pp. 187-196 ◽

Cited By ~ 4

Author(s):

T. Anglade ◽

H.S. Randhawa

Keyword(s):

New Zealand ◽

Fish Species ◽

Life Cycles ◽

Intermediate Hosts ◽

Full Spectrum ◽

Commercial Fish ◽

Parasite Communities ◽

Commercial Species ◽

Comprehensive Survey ◽

Host Parasite

AbstractDespite the fact that tapeworms comprise the bulk of parasite communities of sharks in marine ecosystems, little is known about their life cycles and, more specifically, about the potential intermediate hosts they utilize as transmission routes. In the absence of morphological features required for specific identification of larval tapeworms from potential intermediate hosts, recent molecular advances have contributed to linking larval and adult parasites and, in some instances, uncovering unknown trophic links. Host–parasite checklists are often the first source of information consulted to assess the diversity and host specificity of parasites, and provide insights into parasite identification. However, these host–parasite checklists are only useful if they encompass the full spectrum of associations between hosts and parasites. A checklist of New Zealand fishes and their parasites has been published, but recent parasitological examinations of commercial fish species reveal that the checklist appears to be far from complete. We focused our current study on a comprehensive survey of macroparasites of a commercial species, the New Zealand sole (Peltorhamphus novaezeelandiae) off the coast of Otago, New Zealand. Specifically, we were expecting to recover marine tapeworms using sharks as their definitive hosts that are generally underreported in parasite surveys. The parasites recovered included tapeworms, flukes, round worms and thorny-headed worms. Surprisingly, a large proportion of the non-tapeworm parasites we recovered were not previously reported from this fish species. A discussion on the potential ecological roles played by this fish species in the transmission of parasites is included.

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