scholarly journals Seasonal stability in parasite assemblages of the Brazilian flathead, Percophis brasiliensis (Perciformes: Percophidae): predictable tools for stock identification

2010 ◽  
Vol 57 (3) ◽  
pp. 206-212 ◽  
Author(s):  
Paola E. Braicovich ◽  
Juan T. Timi
Keyword(s):  
Stock Identification ◽  
Parasite Assemblages ◽  
Percophis Brasiliensis

Parasites of the Brazilian flathead Percophis brasiliensis reflect West Atlantic biogeographic regions

Parasitology ◽  
2016 ◽  
Vol 144 (2) ◽  
pp. 169-178 ◽  
Author(s):  
PAOLA E. BRAICOVICH ◽  
CAMILA PANTOJA ◽  
ALDENICE N. PEREIRA ◽  
JOSE L. LUQUE ◽  
JUAN T. TIMI
Keyword(s):  
Distance Decay ◽  
Component Community ◽  
Significant Similarity ◽  
Marine Parasites ◽  
Latitudinal Patterns ◽  
Biogeographic Regions ◽  
Predicted Values ◽  
Fish Hosts ◽  
Parasite Assemblages ◽  
Percophis Brasiliensis

SUMMARYWith the aim of evaluating the utility of marine parasites as indicators of zoogeographical regions in the South West Atlantic, we analyzed data on assemblages of long-lived larval parasites of 488 specimens of Percophis brasiliensis distributed in 11 samples from nine localities covering the entire distribution of the species in the Argentine biogeographical Province. Near half a million long-lived parasite individuals belonging to 17 species present in the whole sample displayed clear latitudinal patterns. Data for parasite assemblages at infracommunity and component community levels were analysed in relation to the geographical distance. Significant similarity decay of parasite assemblages over distance was observed, with those based on abundances and mean abundances showing departures from predicted values of regressions. These departures were represented by higher dissimilarities between samples coming from different zoogeographical regions than between those caught within the same region, independently of the distance separating them. Consequently, zoogeographical regions were identified in a distance-decay context. Multivariate analyses corroborated a close fit of similarity between assemblages to existing zoogeographical classifications. Regressions representing distance decay of similarity, and the identification of their outliers, can therefore shed light on the existence of discontinuities or uniformities in the geographic distribution of parasite assemblages and, in turn, in the zoogeography of their fish hosts.

Trace elements in the otoliths of yellow-eye mullet (Aldrichetta forsteri) as an aid to stock identification

1992 ◽  
Vol 13 (1) ◽  
pp. 39-51 ◽  
Author(s):  
J.S. Edmonds ◽  
R.C.J. Lenanton ◽  
N. Caputi ◽  
M. Morita
Keyword(s):  
Trace Elements ◽  
Stock Identification

Comprehensive microsatellite baseline for genetic stock identification of Atlantic salmon (Salmo salar L.) in northernmost Europe

2017 ◽  
Vol 74 (8) ◽  
pp. 2159-2169 ◽  
Author(s):  
Mikhail Ozerov ◽  
Juha-Pekka Vähä ◽  
Vidar Wennevik ◽  
Eero Niemelä ◽  
Martin-A. Svenning ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Stock Identification ◽  
Genetic Stock ◽  
Atlantic Salmon Salmo Salar ◽  
Genetic Stock Identification

Effects of sex, stock, and environment on the shape of known-age Atlantic cod (Gadus morhua) otoliths

2004 ◽  
Vol 61 (2) ◽  
pp. 158-167 ◽  
Author(s):  
M Cardinale ◽  
P Doering-Arjes ◽  
M Kastowsky ◽  
H Mosegaard
Keyword(s):  
Shape Analysis ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Fourier Descriptors ◽  
Faroe Islands ◽  
Stock Identification ◽  
Relative Importance ◽  
Age Classes ◽  
Otolith Shape ◽  
Left And Right

The effects of sex, stock, and environment on the shape of known-age Atlantic cod (Gadus morhua) otoliths from the Faroe Islands were investigated. Moreover, the feasibility of otolith shape analysis for stock identification was evaluated. The shape was described by using several normalized Fourier descriptors and morphometric variables. There were no consistent differences between the left and right otoliths and between sexes within different age classes, stocks, and environments. With our experimental design, we could evaluate the relative importance of genetic and environmental conditions (water temperature and diet regime) on otolith shape and morphometrics. Using otolith shape, cod individuals were significantly separated into Bank and Plateau stocks. Total classification success was between 79% and 85% between stocks and between 85% and 96% between environments for the different age classes. The significant differences in otolith shape between Faroe Bank and Faroe Plateau cod stocks provided a phenotypic basis for stock separation. Stock and environmental influences were substantial in determining the shape of cod otoliths.

scholarly journals Rapid Phenotypic Stock Identification of Chinook Salmon in Recreational Fishery Management

2021 ◽  
Vol 13 (2) ◽  
pp. 99-112
Author(s):  
Alexander J. Jensen ◽  
Carl B. Schreck ◽  
James T. Peterson
Keyword(s):  
Chinook Salmon ◽  
Fishery Management ◽  
Stock Identification ◽  
Recreational Fishery

scholarly journals Digestive Proteases From Fish Processing Wastes: Their Partial Characterization and Comparison

2020 ◽  
Author(s):  
Ivana Soledad Friedman ◽  
Leonel Agustín Behrens ◽  
Nair A Pereira ◽  
Edgardo Contreras ◽  
Analia Verónica Fernández-Gimenez
Keyword(s):  
Residual Activity ◽  
Fish Processing ◽  
Intestinal Enzymes ◽  
Optimum Ph ◽  
Digestive Proteinases ◽  
Wide Ph Range ◽  
Processing Wastes ◽  
Reducing Costs ◽  
Ph Range ◽  
Percophis Brasiliensis

Abstract Fish processing generates a lot of wastes which are discarded resulting in environmental problems. However, this material represents a significant source of high-value bioproducts with potential biotechnological applications. The objective of this study was to characterize and to compare specific activities of acid and alkaline proteases recovered from the viscera of Merluccius hubbsi (Mh), Percophis brasiliensis (Pb), Urophyis brasiliensis (Ub), and Cynoscion guatucupa (Cg) under different pH and temperature conditions. Stomach proteinases from four species had a higher activity at pH 2, with stability in the range of pH 2-4. Optimum pH from intestinal enzymes of Cg was 11.5, while for the crude extract of Mh, Pb, and Ub catalytic activity was registered over a wide pH range range from 7 to 11.5. Stomach proteinases from four studied species had a higher activity at 30 °C and 50 °C, with stability at 10 °C and 30 °C. Optimum temperature from intestinal enzymes of the four tested species was 50 °C with high stability at 10 °C and 30 °C. Alkaline proteinase from all species and acid proteinases from Cg was inactivated at 70ºC, while stomach enzymes of Mh, Pb, and Ub had a residual activity lower than 5% at 80 °C after 5, 10 y 20 minutes of pre-incubation, respectively. Digestive proteinases recovered in this study could be used as biocatalysts in industrial processes, reducing costs, adding value to the fishery waste, and contributing to the reduction of environmental pollution.

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