scholarly journals Feeding and reproduction including diapausing egg production as cold-water adaptations for overwintering of Acartia steueri (Copepoda, Calanoida) in Okkirai Bay, Sanriku, northern Japan

2020 ◽  
Vol 15 (3) ◽  
pp. 269-278
Author(s):  
Yuichiro Yamada ◽  
Wataru Sato ◽  
Atsushi Kobiyama ◽  
Takehiko Ogata
Keyword(s):  
Egg Production ◽  
Cold Water ◽  
Acartia Steueri ◽  
Northern Japan

The utilization of cold-water zooplankton as prey for chum salmon fry (Oncorhynchus keta) in Yamada Bay, Iwate, Pacific coast of northern Japan

2019 ◽  
Vol 29 ◽  
pp. 100633
Author(s):  
Yuichiro Yamada ◽  
Kei Sasaki ◽  
Kodai Yamane ◽  
Miwa Yatsuya ◽  
Yuichi Shimizu ◽  
...  
Keyword(s):  
Chum Salmon ◽  
Pacific Coast ◽  
Cold Water ◽  
Oncorhynchus Keta ◽  
Salmon Fry ◽  
Northern Japan

scholarly journals Late Miocene ostracods from the Fujikotogawa Formation, northern Japan – with reference to cold water species involved with trans-Arctic interchange

1994 ◽  
Vol 13 (1) ◽  
pp. 3-15 ◽  
Author(s):  
Toshiaki Irizuki
Keyword(s):  
Late Miocene ◽  
Cold Water ◽  
The Arctic ◽  
Bering Strait ◽  
The Pacific ◽  
Northern Atlantic ◽  
Water Species ◽  
Cold Water Species ◽  
Ostracod Species ◽  
Northern Japan

Abstract. Seventy-eight ostracod species belonging to 38 genera are recognized from the late Miocene Fujikotogawa Formation (c. 7–8 Ma), 40 km NE of Akita City, northern Japan. Some 30–40% of the ostracod species belong to the cold water groups (circumpolar and cryophilic species) reported from Plio-Pleistocene formations yielding the Omma-Manganji Fauna, the name given by Otuka (1939) to the Pliocene Japanese cold water molluscan fauna. This study demonstrates that most ostracod species distinguished in deposits yielding the Omma-Manganji Fauna had already appeared in the late Miocene. At least 13 of the ostracod species have been reported from both the Arctic and northern Atlantic Oceans, implying migration from the Pacific to the northern Atlantic through the Arctic after the Bering Strait had been breached. The 13 circumpolar, nine cryophilic and four endemic cold water species are illustrated, with brief taxonomic notes.

Temporal variation in fish egg and larval production by pelagic and bottom spawners in a large Newfoundland coastal embayment

2008 ◽  
Vol 65 (2) ◽  
pp. 159-175 ◽  
Author(s):  
Paul V.R. Snelgrove ◽  
Ian R Bradbury ◽  
Brad deYoung ◽  
Sandra Fraser
Keyword(s):  
Life History ◽  
Egg Production ◽  
Cold Water ◽  
Larval Abundance ◽  
Larval Stages ◽  
Coastal Embayment ◽  
Larval Production ◽  
Pelagic Eggs ◽  
Early Fall ◽  
Placentia Bay

In highly seasonal environments such as coastal Newfoundland, local production, advection, and life history may influence ichthyoplankton community structure. The spring bloom occurs in cold water that slows development of eggs from pelagic spawners and may transport propagules from optimal nearshore areas before hatch. For bottom spawners that affix eggs to the bottom, the problem is reduced because only actively swimming larval stages are pelagic. We hypothesize that larvae of pelagic spawners are limited to warmer, summer waters, whereas larvae of bottom spawners are less constrained temporally and less subject to flushing from the nearshore environment. Ichthyoplankton taxa sampled in Placentia Bay, Newfoundland, during spring–summer in 1997–1999 showed consistent seasonal peaks in egg and larval abundance. Although pelagic egg production spanned spring and summer, larval abundance peaked late in summer or early fall in the most productive areas of the bay. Larval abundance of bottom spawners peaked in spring for most taxa. Thus, pelagic eggs hatch quickly in summer, and larvae can utilize the late peak in nearshore copepod abundance. Bottom spawners can utilize spring zooplankton because temperature-dependent development does not influence egg advection. Coastal advection and temperature influence how different life history groups exploit spatial and temporal peaks in production.

Ontogenetic change in valve characters in three new species of Baffinicythere (Ostracoda, Crustacea) from Northern Japan

1996 ◽  
Vol 70 (3) ◽  
pp. 450-462 ◽  
Author(s):  
Toshiaki Irizuki
Keyword(s):  
New Species ◽  
Cold Water ◽  
The Arctic ◽  
Northern High Latitude ◽  
Northern Atlantic ◽  
Three New Species ◽  
Recent Sediments ◽  
Species Specific ◽  
Shape Changes ◽  
Northern Japan

The genus Baffinicythere is a northern high-latitude marine ostracode, which includes four species: B. howei Hazel, B. ishizakii new species, B. reticulata new species, B. robusticostata new species. The first species occurs only in late Pliocene to Recent sediments of the Arctic and northern Atlantic Oceans. The remaining three species are abundant in the Plio–Pleistocene formations of northern Japan, which yield cold-water molluscan faunas. Detailed morphological analyses and paleogeographic distribution of the three new species indicates that: 1) B. reticulata has some primitive characters relative to the other two species; 2) B. ishizakii and B. robusticostata seem to have had different strategies as regards rate of ontogenetic size increase; 3) the left valve outlines can be resolved into two components, ontogenetic shape changes and species-specific distinctions among the species; and 4) B. robusticostata invaded areas inhabited by B. reticulata and may have excluded it during the late Pleistocene. The Atlantic species B. howei has not been recorded from northern Japan. Comparisons of B. reticulata and B. howei, based on their pore distribution and reticulate sculptures, suggest that B. reticulata could have migrated to the Arctic Province after the Bering land barrier had been breached and then evolved rapidly into B. howei.

scholarly journals Spotted Wolffish Broodstock Management and Egg Production: Retrospective, Current Status, and Research Priorities

Animals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2849
Author(s):  
Nathalie Rose Le François ◽  
José Beirão ◽  
Joshua Superio ◽  
Bernard-Antonin Dupont Cyr ◽  
Atle Foss ◽  
...  
Keyword(s):  
Egg Production ◽  
Large Scale ◽  
Cold Water ◽  
Full Range ◽  
Genetic Selection ◽  
Monitoring Program ◽  
Research Priorities ◽  
Commercial Production ◽  
Current Status ◽  
Spotted Wolffish

The first artificially fertilized spotted wolffish (Anarhichas minor) eggs hatched in Norway in the mid-1990s as this species was considered by Norwegian authorities to be a top candidate species for cold-water aquaculture in the North Atlantic regions. Previous research conducted in Norway (since 1992) and Canada (since 2000), focused on identifying key biological parameters for spotted wolffish cultivation which led, respectively, to the rapid establishment of a full commercial production line in northern Norway, while Québec (Canada) is witnessing its first privately driven initiative to establish commercial production of spotted wolffish on its territory. The control of reproduction can be viewed as a major requirement to achieve the development of performant strains using genetic selection tools and/or all-year-round production to bring about maximal productivity and synchronization among a given captive population. Although the basic reproduction aspects are more understood and controlled there are still some challenges remaining involving broodstock and upscaling of operations that limit the achievement of a standardized production at the commercial level. Quality of gametes is still considered a major constraint and it can be affected by multiple factors including nutrition, environmental conditions, handling practices, and welfare status. Internal insemination/fertilization and the protracted incubation period are challenging as well as the establishment of a health monitoring program to secure large-scale operations. The profound progress achieved in the control of reproduction, sperm handling, and cryopreservation methods for this species is presented and discussed. In this review, we also go into detail over the full range of up-to-date cultivation practices involving broodstock and identify areas that could benefit from additional research efforts (i.e., broodstock nutrition, health and welfare, scaling-up egg and larval production, genetics, and development of selective breeding programs).

Are egg production and respiration of the marine pelagic copepod Acartia steueri influenced by crowding?

2020 ◽  
Vol 51 (9) ◽  
pp. 3741-3750
Author(s):  
Yoshiki Takayama ◽  
Minamo Hirahara ◽  
Xin Liu ◽  
Syuhei Ban ◽  
Tatsuki Toda
Keyword(s):  
Egg Production ◽  
Pelagic Copepod ◽  
Acartia Steueri
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