Results 91 to 100 of about 190,110 (296)
Teach Aquaculture Curriculum: Spawning and Rearing Bivalve Molluscs—Spawning
EDIS, 2011 This document contains an activity for students about methods for spawning bivalve molluscs like clams or oysters using temperature manipulation. Students will use an ocular micrometer to measure the diameter of bivalve eggs and the length of bivalve larvae.
R. Leroy Creswell +6 more
openaire +5 more sources
Ciência Rural, 2000 Several studies have suggested that the caudal neurosecretory system could act on fish reproduction. The aim of this study was to compare the effect of urophysial extract (UE) and carp pituitary homogenate (CPH) on the induction of spawning in Hoplias ...
Everton Rodolfo Behr +4 more
doaj +1 more source
Status of the spawning biomass of the Pacific sardine, 1980-81 [PDF]
, 1980 State law requires that the population of Pacific sardines, Sardinops sagax caeruleus, must reach a minimum spawning biomass of 20,000 short tons before initiation of a fishery.
Klingbeil, Richard A.
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Length at First Maturity, Spawning TIME, and Reproductive Output in the Females of Hamilton\u27s Anchovy (Thryssa Hamiltonii Gray, 1835) [PDF]
, 2020 The Hamilton\u27s anchovy (Thryssa hamiltonii Gray, 1835) is one of main target species in Indonesian small pelagic fishery. This engraulids member is characterized by short lifespan and fast reproductive cycle.
Dewi, N. N. (Nina) +2 more
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International Journal of Osteoarchaeology, EarlyView.ABSTRACT Studying goose domestication through archaeological finds has been challenging due to the similar skeletal morphology of the European domestic goose and its wild progenitor, the greylag goose (Anser anser). We analyzed stable carbon (δ13C) and nitrogen (δ15N) isotopes from bone collagen of subfossil domestic and potentially domestic geese to ...
Johanna Honka +7 more
wiley +1 more source
Acta Biologica Sibirica, 2018 This paper describes spawning events of the white bream Blicca bjoerkna (Linnaeus, 1758 )in astronomical and biological time depending on seasonal patterns of climatic conditions.
D. Bondarev, O. Kunakh, O. Zhukov
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Concepts of spawning targets [PDF]
, 2000 This report discusses the concepts of spawning targets. Spawning target setting is based on the fact that the number of smolts produced by any given river is constrained by habitat availability.
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Oikos, EarlyView.Competition theory suggests that interspecific prey competition can result in changes to the dietary niche, but obtaining timeseries of data from sympatric species experiencing temporal variation in competition is challenging. Scotland is an important area for two species of seals, but over the past 20 years, populations of harbour seals Phoca vitulina
Izzy Langley +7 more
wiley +1 more source
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]
, 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
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People and Nature, EarlyView.Abstract Different aspects of ecological systems, biotic or abiotic, often fluctuate in coordinated patterns over space and time. Such high concordance between ecological processes is often referred to as ecological synchrony. Human activities, including and beyond climate change, have the potential to alter ecological synchrony by disrupting or ...
Yiluan Song +9 more
wiley +1 more source