Results 1 to 10 of about 5,577 (169)

Identifying the potential of anadromous salmonid habitat restoration with life cycle models. [PDF]

open access: yesPLoS ONE, 2021
An investigation into the causes of species decline should include examination of habitats important for multiple life stages. Integrating habitat impacts across life stages with life-cycle models (LCMs) can reveal habitat impairments inhibiting recovery
Jeffrey C Jorgensen   +3 more
doaj   +2 more sources

The effect of temperature on the duration of spawning markers—migratory-nucleus and hydrated oocytes and postovulatory follicles—in the multiple-batch spawner Japanese flounder (Paralichthys olivaceus) [PDF]

open access: yes, 2011
The duration of spawning markers (e.g. signs of previous or imminent spawnings) is essential information for estimating spawning frequency of fish. In this study, the effect of temperature on the duration of spawning markers (i.e., oocytes at early ...
Amano, Masafumi   +2 more
core   +3 more sources

Reproductive Characteristics of the Pond-Farmed Sultan Fish (Leptobarbus hoevenii)

open access: yesJurnal Ilmiah Perikanan dan Kelautan, 2021
Highlight Research • The reproductive characteristics of L. hoevenii were examined • The potentially smallest maturity sizes of female and male L. hoevenii were 350 g and 180 g, respectively • The fecundity of a 1,000 g L.
Sajeenuth Srithongthum   +7 more
doaj   +1 more source

Quantitative Analysis of Ovarian Dynamics of European Sardine Sardina pilchardus (Walbaum, 1792) during Its Spawning Period

open access: yesFishes, 2023
Fish with indeterminate fecundity spawn multiple times throughout a protracted reproductive period. During that period several ovulation events succeed one another, and different oocyte developmental stages co-occur in the ovaries with new oocytes ...
Eleni Servou   +2 more
doaj   +1 more source

Testing for broad-scale relationships between freshwater habitat pressure indicators and Pacific salmon population trends

open access: yesEcological Indicators, 2023
Global freshwater biodiversity is declining at rates greater than in terrestrial or marine environments, largely due to habitat alteration and loss. Pacific salmon are declining throughout much of their southern range due to a combination of pressures in
Stephanie J. Peacock   +5 more
doaj   +1 more source

Reproductive biology of Parona signata (Actinopterygii: Carangidae), a valuable economic resource, in the coastal area of Mar del Plata, Buenos Aires, Argentina [PDF]

open access: yesNeotropical Ichthyology, 2020
The reproductive biology and life cycle of Parona leatherjacket, Parona signata, present in Mar del Plata (38º 00’S 57º 33’W) coast, was studied. Samples were obtained monthly since January 2018 to February 2019 from the artisanal fishermen and the ...
Santiago Julián Bianchi   +1 more
doaj   +2 more sources

Genetic signs of multiple colonization events in Baltic ciscoes with radiation into sympatric spring‐ and autumn‐spawners confined to early postglacial arrival [PDF]

open access: yesEcology and Evolution, 2014
AbstractPresence of sympatric populations may reflect local diversification or secondary contact of already distinct forms. The Baltic cisco (Coregonus albula) normally spawns in late autumn, but in a few lakes in Northern Europe sympatric autumn and spring‐ or winter‐spawners have been described.
Delling, Bo   +3 more
openaire   +4 more sources

Reproductive biology of Garra regressus and Garra tana (Cypriniformes: Cyprinidae) from Lake Tana, Ethiopia

open access: yesJournal of Threatened Taxa, 2015
The reproductive biology of Garra regressus and Garra tana was investigated by collecting monthly samples (January to December 2006) from the southern Gulf of Lake Tana, where these species are endemic.  Garra regressus has an extended breeding time from
Akewake Geremew   +2 more
doaj   +3 more sources

Broadcast spawning by Pocillopora species on the Great Barrier Reef. [PDF]

open access: yesPLoS ONE, 2012
The coral genus Pocillopora is one of the few to include some species that broadcast spawn gametes and some species that brood larvae, although reports of reproductive mode and timing vary within and among species across their range.
Sebastian Schmidt-Roach   +4 more
doaj   +1 more source

Evaluating the performance of survey-based operational management procedures [PDF]

open access: yes, 2010
The design and evaluation of survey-based management strategies is addressed in this article, using three case-study fisheries: North Sea herring, Bay of Biscay anchovy and North Sea cod, with a brief history and the main management issues with each ...
Apostolaki, P.   +4 more
core   +6 more sources

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