Early life stages, growth, and reproduction of spring-spawning ciscoes (Coregonus artedii) in Lac des Écorces, Quebec

1991 ◽  
Vol 69 (6) ◽  
pp. 1644-1652 ◽  
Author(s):  
Michel Hénault ◽  
Réjean Fortin
Keyword(s):  
Environmental Conditions ◽  
Early Life ◽  
Liver Weight ◽  
Life Stages ◽  
Early Life Stages ◽  
Total Length ◽  
Males And Females ◽  
Coregonus Artedii ◽  
Egg Diameter ◽  
First Time

The biological characteristics of an allopatric population of spring-spawning ciscoes, an extremely rare ecotype, were studied at Lac des Écorces (southwestern Quebec). Environmental conditions during the early life stages are marginal for the species; the eggs are deposited in the deeper section (>20 m) of the lake and the first larva was caught on 30 July. Epilimnetic temperatures were then near the upper lethal threshold for fall cisco larvae. Lac des Écorces ciscoes are very small at the end of their 1st year of life (mean total length 58 mm). They more than double in length during their 2nd year (mean total length 161 mm). Growth thereafter, longevity, fecundity, and egg diameter are within the observed ranges for the species. Spawning occurs from mid-May to early June. Males and females spawn for the first time at age 3. The best predictor of fecundity is liver weight. Gametogenesis occurs under environmental conditions different from those encountered by fall-spawning salmonids. Seasonal changes in the gonadosomatic and hepatosomatic indexes are discussed in terms of temperature, photoperiod, and hormonal influences.

The influence of environmental conditions on early life stages of flounder (Platichthys flesus) in the central Baltic Sea

2013 ◽  
Vol 75 ◽  
pp. 77-84 ◽  
Author(s):  
Didzis Ustups ◽  
Bärbel Müller-Karulis ◽  
Ulf Bergstrom ◽  
Andrej Makarchouk ◽  
Ivo Sics
Keyword(s):  
Baltic Sea ◽  
Environmental Conditions ◽  
Early Life ◽  
Life Stages ◽  
Early Life Stages ◽  
Platichthys Flesus

scholarly journals Assemblage Structure of Larval Fishes in Epipelagic and Mesopelagic Waters of the Northern Gulf of Mexico

2021 ◽  
Vol 8 ◽  
Author(s):  
Verena H. Wang ◽  
Carley R. Zapfe ◽  
Frank J. Hernandez
Keyword(s):  
Gulf Of Mexico ◽  
Environmental Conditions ◽  
Early Life ◽  
Fish Assemblages ◽  
Larval Fish ◽  
Critical Role ◽  
Life Stages ◽  
Early Life Stages ◽  
Northern Gulf Of Mexico ◽  
Larval Fishes

The early life stages of fishes play a critical role in pelagic food webs and oceanic carbon cycling, yet little is known about the taxonomic composition and distribution of larval fishes in the northern Gulf of Mexico (GOM) below the epipelagic (<200 m). Here, we provide the first large-scale characterization of larval fish assemblages in the GOM across epipelagic, mesopelagic, and bathypelagic regions (0–1,500 m), using samples collected during the Natural Resource Damage Assessment conducted following the Deepwater Horizon oil spill (DWHOS). These data contain > 130,000 ichthyoplankton specimens from depth-discrete plankton samples collected across 48 stations in the GOM during six cruises conducted in 2010 and 2011. We examined indices of abundance and diversity, and used a multivariate regression tree approach to model the relationship between larval fish assemblages and environmental conditions. The total abundance of larval fish followed a generally decreasing trend with increasing depth, and family-level richness and diversity were significantly higher in the epipelagic than mesopelagic and bathypelagic regions. Fourteen distinct assemblage groups were identified within the epipelagic, with depth, surface salinity, and season contributing to the major branches separating groups. Within the mesopelagic, seven distinct assemblage groups were identified and were largely explained by variation in depth, season, and surface temperature. Bathypelagic assemblages were poorly described by environmental conditions. The most common epipelagic assemblage groups were widely distributed across the GOM, as were all mesopelagic assemblage groups, suggesting limited horizontal structuring of GOM larval fishes. Of the mesopelagic-associated fish taxa, four dominant families (Myctophidae, Gonostomatidae, Sternoptychidae, Phosichthyidae) comprised the majority of the catch in both the epipelagic (63%) and combined mesopelagic and bathypelagic (97%) regions. Dufrêne-Legendre indicator analysis confirmed that these dominant families were characteristic of epipelagic and mesopelagic assemblages; the larvae of less common mesopelagic-associated families largely identified with epipelagic assemblage groups. A lack of baseline data about the distribution patterns of early life stages of mesopelagic fishes in the GOM was apparent following the DWHOS, and these findings provide a valuable reference point in the face of future ecosystem stressors.

scholarly journals Novel insights into early life stages of finned octopods (Octopoda: Cirrata)

2021 ◽  
Vol 140 (1) ◽  
Author(s):  
Alexander Ziegler ◽  
Abigail Miller ◽  
Nina Nagelmann
Keyword(s):  
Deep Sea ◽  
Early Life ◽  
Imaging Techniques ◽  
Three Dimensional ◽  
Life Stages ◽  
Early Life Stages ◽  
Egg Capsules ◽  
First Time ◽  
Capsule Size ◽  
Combined Data

AbstractThe finned or dumbo octopods (Octopoda: Cirrata) constitute a cephalopod (Mollusca: Cephalopoda) taxon almost exclusively comprising organisms that inhabit the deep-sea. This renders studying the general biology of adult cirrate specimens a difficult task, but even more so when it comes to gathering knowledge on their early life stages. During his comprehensive research exploits on cephalopod development, the late Sigurd von Boletzky (1942–2020) also sought to shed light on specific adaptations that eggs and embryos of these enigmatic deep-sea octopods might show. Based on his seminal work, the present article sets out to provide additional data on a broad range of early cirrate life stages, including egg capsules without any obvious embryonic stage as well as those containing embryos. These previously unreported specimens obtained from museum collections were analyzed using conventional morphological as well as modern three-dimensional imaging techniques. The present overview includes specimens from four of the five oceans, i.e., the Atlantic, Pacific, Indian, and Southern Ocean. Based on information on cirrate ovum, chorion, and egg capsule size as well as shape gathered from the literature, an attempt is made here for the first time to identify von Boletzky's as well as the specimens introduced here down to at least genus level. The combined data provide novel insights into early life stages of finned octopods, aiming to continue von Boletzky's legacy with regard to developmental research on a still largely enigmatic taxon of extant deep-sea cephalopods.

scholarly journals Optimal reproductive phenology under size-dependent cannibalism

2019 ◽  
Author(s):  
Nao Takashina ◽  
Øyvind Fiksen
Keyword(s):  
Environmental Conditions ◽  
Early Life ◽  
Life Stage ◽  
Larval Growth ◽  
Reproductive Phenology ◽  
Life Stages ◽  
Breeding Phenology ◽  
Early Life Stages ◽  
Size Dependent ◽  
Game Theoretic

AbstractIntra-cohort cannibalism is an example of a size-mediated priority effect. If early life stages cannibalize slightly smaller individuals, then parents face a trade-off between breeding at the best time for larval growth or development and predation risk from offspring born earlier. This game-theoretic situation among parents may drive adaptive reproductive phenology towards earlier breeding. However, it is not straightforward to quantify how cannibalism affects seasonal egg fitness or to distinguish emergent breeding phenology from alternative adaptive drivers. Here, we devise an age-structured game-theoretic mathematical model to find evolutionary stable breeding phenologies. We predict how size-dependent cannibalism acting on eggs, larvae, or both change emergent breeding phenology, and find that breeding under inter-cohort cannibalism occurs earlier than the optimal match to environmental conditions. We show that emergent breeding phenology patterns at the level of the population are sensitive to the ontogeny of cannibalism, i.e. which life stage is subject to cannibalism. This suggests that the nature of cannibalism among early life stages is a potential driver of the diversity of reproductive phenologies seen across taxa, and may be a contributing factor in situations where breeding occurs earlier than expected from environmental conditions.

Natural and anthropogenic effects on the early life stages of European anchovy in one of its essential fish habitats, the Guadalquivir estuary

2019 ◽  
Vol 617-618 ◽  
pp. 67-79 ◽  
Author(s):  
GF de Carvalho-Souza ◽  
E González-Ortegón ◽  
F Baldó ◽  
C Vilas ◽  
P Drake ◽  
...  
Keyword(s):  
Early Life ◽  
Anthropogenic Effects ◽  
Life Stages ◽  
Early Life Stages ◽  
European Anchovy ◽  
Guadalquivir Estuary ◽  
Fish Habitats

Incubation Temperature Influences the Duration of Egg Hatching and Early Development in the Boreal Digging Frog, Kaloula Borealis

2020 ◽  
Vol 3 (1) ◽  
pp. ACCEPTED
Author(s):  
Rho-Jeong Rae
Keyword(s):  
Water Temperature ◽  
Early Life ◽  
Rainy Season ◽  
Incubation Temperature ◽  
Life Stages ◽  
Early Life Stages ◽  
Egg Hatching ◽  
Significant Difference ◽  
The Mean ◽  
Hatching Rates

This study investigated the boreal digging frog, Kaloula borealis, to determine the egg hatching period and whether the hatching period is affected by incubation temperature. The results of this study showed that all the eggs hatched within 48 h after spawning, with 28.1% (±10.8, n=52) hatching within 24 h and 99.9% (±0.23, n=49) within 48 h after spawning. A significant difference was noted in the mean hatching proportion of tadpoles at different water temperatures. The mean hatching rates between 15 and 24 h after spawning was higher at a water temperature of 21.1 (±0.2) °C than at 24.1 (±0.2) °C. These results suggest that incubation temperature affected the early life stages of the boreal digging frog, since they spawn in ponds or puddles that form during the rainy season.

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