Reproductive Patterns of Pacific Ocean Perch (Sebastodes alutus) off Washington and British Columbia and their Relation to Bathymetric Distribution and Seasonal Abundance

1971 ◽  
Vol 28 (3) ◽  
pp. 417-425 ◽  
Author(s):  
Donald R. Gunderson
Keyword(s):  
British Columbia ◽  
Pacific Ocean ◽  
Deep Water ◽  
Seasonal Abundance ◽  
Bathymetric Distribution ◽  
Mating Period ◽  
Spawning Period ◽  
Reproductive Patterns ◽  
Catch Rates ◽  
Spring Maximum

Females of the ovoviviparous species Sebastodes alutus release their larvae in March in the Washington–British Columbia area. Male maturity data from Queen Charlotte Sound indicated that males probably inseminate females in September or October. Examination of the annual bathymetric cycle in three major commercial trawling areas showed that mating and insemination occur while Pacific ocean perch are moving to deep water from the shallow-water regions inhabited in summer and that females release their larvae while in the deepest part of their bathymetric range.Total 1955 through 1965 catch by month, and 11-year mean monthly catch rates were used to indicate relative seasonal abundance on major fishing grounds. Where deepwater regions were trawled, these indices showed a spring maximum associated with the March spawning period. In all areas studied there was a midsummer slump in catch and catch rate, and an October maximum occurring during the suggested mating period.

Large fossil birds from a Late Cretaceous marine turbidite sequence on Hornby Island (British Columbia)

2011 ◽  
Vol 48 (11) ◽  
pp. 1489-1496 ◽  
Author(s):  
Gareth Dyke ◽  
Xia Wang ◽  
Gary Kaiser
Keyword(s):  
British Columbia ◽  
Pacific Ocean ◽  
Late Cretaceous ◽  
Deep Water ◽  
Fossil Birds ◽  
Size Classes ◽  
Eastern Margin ◽  
The Pacific ◽  
The Pacific Ocean

Few fossil birds and non-avian dinosaurs are known from Mesozoic sediments bordering the eastern margin of the Pacific Ocean. Here, we describe additional remains of Late Cretaceous birds from a deep-water marine turbidite sequence of the Northumberland Formation exposed on Hornby Island, British Columbia. The bones described here are referable (based on hypothesized autapomorphies) to the Cretaceous avian lineages Enantiornithes and Ornithurae and fall into at least two size classes within either lineage. This suggests the presence of multiple taxa occurring within the Northumberland Formation.

Orbiniella nuda new species (Orbiniidae) and nine new records of other sedentariate polychaetous annelids from Washington and British Columbia

1974 ◽  
Vol 52 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Katharine D. Hobson
Keyword(s):  
British Columbia ◽  
New Species ◽  
Pacific Ocean ◽  
New Records ◽  
Descriptive Information ◽  
Northeastern Pacific

Orbiniella nuda, new species, is newly described from Washington. Naineris quadricuspida, Pygospio elegans, Pherusa negligens, Asclerocheilus beringianus, Euzonus williamsi, Barantolla americana, Decamastus gracilis, Mediomastus capensis, and Stygocapitella subterranea are newly recorded from Washington or from Washington and British Columbia. Most of these species have not previously been reported from the cold temperate northeastern Pacific Ocean. In addition, new descriptive information is provided for some species.

Palmaria hecatensis sp. nov. (Rhodophyta, Palmariales) from British Columbia and Alaska with a survey of other Palmaria species

1985 ◽  
Vol 63 (3) ◽  
pp. 474-482 ◽  
Author(s):  
Michael W. Hawkes
Keyword(s):  
British Columbia ◽  
Pacific Ocean ◽  
Geographical Distribution ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Aleutian Islands ◽  
Rocky Shores ◽  
Intertidal Zones ◽  
The North ◽  
The North Pacific

Palmaria hecatensis sp. nov. is described based on material from northern British Columbia. Male gametophytes and tetrasporophytes are thick, coriaceous, flattened blades, linear to lobed in habit and arise from an extensive encrusting basal holdfast. Putative female gametophytes are microscopic multicellular discs. Palmaria hecatensis grows on rocky shores in the midintertidal to lower intertidal zones and has a known geographical distribution from Nootka Island, Vancouver Island, B.C., to Shemya Island in the Aleutian Islands, Alaska. Palmaria hecatensis is compared with other species in the genus and, in addition, another distinctive (and possibly undescribed) Palmaria species from British Columbia and Alaska is discussed, bringing the total number of Palmaria species reported in the North Pacific Ocean to six.

scholarly journals Coastal winds drive a recruitment mechanism for estuarine fisheries

2020 ◽  
Author(s):  
Hayden T. Schilling ◽  
Charles Hinchliffe ◽  
Jonathan P. Gillson ◽  
Anthony Miskiewicz ◽  
Iain M. Suthers
Keyword(s):  
Larval Fish ◽  
Future Research ◽  
Larval Abundance ◽  
Spawning Period ◽  
Onshore Wind ◽  
Larval Recruitment ◽  
Australian Region ◽  
Coastal Winds ◽  
Key Driver ◽  
Catch Rates

AbstractCoastal winds transport larval fish onshore or offshore which may contribute to estuarine recruitment, yet our understanding of the mechanism underlying this relationship is limited. Here, we show that larval abundance of coastally spawned species increased with weak to moderate upwelling favourable winds 14 days prior to sampling, reflecting increased nutrient and plankton availability for larval fish. A strong decline in larval abundance was observed following strong upwelling favourable winds while abundance increased with onshore (downwelling favourable) winds, in relation to offshore and onshore wind-driven transport. Subsequently, we show that effects of wind during the spawning period can be detected in lagged estuarine commercial fisheries catch rates of coastally spawned species (lagged by 2 – 8 years depending on species’ growth rates), representing the same mechanism proposed for larval fish. Upwelling favourable winds in the southeast Australian region have increased since 1850 while onshore winds have decreased, which may reduce larval recruitment to estuaries. Coastal winds are likely an important factor for estuarine recruitment in the east Australian region and future research on the estuarine recruitment of fish should incorporate coastal winds. As global winds are changing, it is important to investigate if this mechanism is applicable to other regions around the world where coastal winds are a key driver of upwelling.

The reproductive cycle and size at maturity observed in Cancer pagurus in the Shetland Islands, Scotland

2007 ◽  
Vol 87 (5) ◽  
pp. 1181-1189 ◽  
Author(s):  
Shelly M.L. Tallack
Keyword(s):  
Reproductive Cycle ◽  
Carapace Width ◽  
Biological Indicators ◽  
Size At Maturity ◽  
Mating Period ◽  
Spawning Period ◽  
Functional Maturity ◽  
Shetland Islands ◽  
Egg Capsules ◽  
Cancer Pagurus

Seasonality of the reproductive cycle for Cancer pagurus was determined using three biological indicators: extruding sperm plugs (mating period), extrusion of eggs (spawning period) and presence of empty egg capsules (hatching period). Sperm plugs were found only in recently moulted females, indicating that mating coincides with moulting periods. Cancer pagurus mating indicators were observed during the summer months and into autumn; spawning occurred in winter, and broods were hatching throughout the summer into early autumn. Size at maturity, was assessed using a variety of reproductive and morphometric criteria; estimates from reproductive criteria are generally larger than those from morphometric criteria and these differences are often indicative of ‘functional’ vs ‘behavioural’ maturity. In C. pagurus, size at maturity estimates ranged from 101.6–125.0 mm carapace width (CW) in males and 110.7–147.3 mm CW in females; the sizes at functional maturity proposed are larger than those from morphometric indicators.

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