Growth, Reproduction, and Distribution of Pandalid Shrimps in British Columbia

1964 ◽  
Vol 21 (6) ◽  
pp. 1403-1452 ◽  
Author(s):  
T. H. Butler
Keyword(s):  
British Columbia ◽  
Body Weight ◽  
Sex Change ◽  
Strait Of Georgia ◽  
Phase Averaging ◽  
Commercial Importance ◽  
Total Length ◽  
The Family ◽  
Early Maturing ◽  
Female Phase

The ranges, habitats, and commercial importance are described for nine species of the family Pandalidae: Pandalopsis dispar, Pandalus jordani, P. borealis, P. platyceros, P. hypsinotus, P. danae, P. montagui tridens, P. stenolepis, P. goniurus. A key for their identification is given. Over 27,400 specimens were sampled, using trawl and trap gear, mostly from the Strait of Georgia. Pandalopsis dispar is a male at [Formula: see text] years, attaining a total length of 136 mm and body weight of 6.5 g; at 30 months, in the female phase, the length is 169 mm and weight 16.3 g. Pandalus jordani matures as a male, and to a lesser extent a female, at about 18 months, reaching a length of 105 mm and weight of 3.8 g; at [Formula: see text] years all are in the female phase, averaging 118 mm in total length and 5.8 g in body weight. P. platyceros is first a male at [Formula: see text] years, attaining a length of 140 mm and weight of 14.2 g; most remain as males for another year, and at [Formula: see text] years the total length is 180 mm and weight 35.5 g. Pandalus hypsinotus matures as a male, and to some extent as a female, at about [Formula: see text] years, at a total length of 124 mm and weight of 10.3 g; at 30 months the length is 130 mm and weight 12.7 g. Almost as many females as males of P. borealis mature at [Formula: see text] years, attaining a length of 95 mm and weight of 3.2 g; at 30 months, in the female phase, the length is 119 mm and weight 6.1 g. Pandalus danae matures first as a male, and to some extent as a female, at [Formula: see text] years, reaching 88 mm in length and 4.4 g; in the female phase, at [Formula: see text] years the length is 105 mm and weight 8.5 g. Growth of P. montagui tridens, P. stenolepis, and P. goniurus is uncertain, but all undergo sex change. Growth as related to habitat and early maturing of females as related to geographic and bathymetric ranges are discussed.

scholarly journals Upper-crustal structure beneath the Strait of Georgia, Southwest British Columbia

2007 ◽  
Vol 170 (2) ◽  
pp. 800-812 ◽  
Author(s):  
R. K. Dash ◽  
G. D. Spence ◽  
M. Riedel ◽  
R. D. Hyndman ◽  
T. M. Brocher
Keyword(s):  
British Columbia ◽  
Crustal Structure ◽  
Strait Of Georgia

Characterizing spatial structures of larval fish assemblages at multiple scales in relation to environmental heterogeneity in the Strait of Georgia (British Columbia, Canada)

2018 ◽  
Vol 75 (11) ◽  
pp. 1902-1914 ◽  
Author(s):  
Lu Guan ◽  
John F. Dower ◽  
Pierre Pepin
Keyword(s):  
British Columbia ◽  
Environmental Heterogeneity ◽  
Multiple Scales ◽  
Larval Fish ◽  
Critical Role ◽  
Multiscale Approach ◽  
Spatial Structures ◽  
Strait Of Georgia ◽  
Medium Scale

Spatial structures of larval fish in the Strait of Georgia (British Columbia, Canada) were quantified in the springs of 2009 and 2010 to investigate linkages to environmental heterogeneity at multiple scales. By applying a multiscale approach, principal coordinate neighborhood matrices, spatial variability was decomposed into three predefined scale categories: broad scale (>40 km), medium scale (20∼40 km), and fine scale (<20 km). Spatial variations in larval density of the three dominant fish taxa with different early life histories (Pacific herring (Clupea pallasii), Pacific hake (Merluccius productus), and northern smoothtongue (Leuroglossus schmidti)) were mainly structured at broad and medium scales, with scale-dependent associations with environmental descriptors varying interannually and among species. Larval distributions in the central-southern Strait were mainly associated with salinity, temperature, and vertical stability of the top 50 m of the water column on the medium scale. Our results emphasize the critical role of local estuarine circulation, especially at medium spatial scale, in structuring hierarchical spatial distributions of fish larvae in the Strait of Georgia and suggest the role of fundamental differences in life-history traits in influencing the formation and maintenance of larval spatial structures.

Two new species of stalked crinoids from the northeastern Pacific in the genera Gephyrocrinus and Ptilocrinus (Echinodermata, Crinoidea, Hyocrinidae). Effects of ontogeny and variability on hyocrinid taxonomy

Zootaxa ◽  
2011 ◽  
Vol 2825 (1) ◽  
pp. 1 ◽  
Author(s):  
MICHEL ROUX ◽  
PHILIP LAMBERT
Keyword(s):  
British Columbia ◽  
New Species ◽  
Single Species ◽  
Depth Range ◽  
Evolutionary Trend ◽  
Exceptional Collection ◽  
The Family ◽  
Two New Species ◽  
Northeastern Pacific ◽  
Stalked Crinoids

Two new species of deep-sea stalked crinoids belonging to the family Hyocrinidae were collected in the northeastern Pacific. The descriptions contain detailed information on character variations and ontogeny. The five specimens of Gephyrocrinus messingi n. sp. lived at depths ranging from 1,777 m to 2,110 m off British Columbia and California. This new species is the first record of the genus Gephyrocrinus in the Pacific Ocean, which was previously known from only a single species, G. grimaldii, from the northeastern Atlantic at the same depth range. The two species illustrate opposing phenotypes within the same genus. Fifty-eight specimens of the second new species, Ptilocrinus clarki n. sp., were dredged off British Columbia close to the type-locality of P. pinnatus, the type species of the genus Ptilocrinus, but at shallower depths ranging from 1,178 to 1,986 m. This exceptional collection provides significant data on intraspecific variation in the main morphological characters, especially arm pattern. The ontogeny of stalk articulations and the main traits of adoral plate differentiation are described in detail. A complementary investigation on P. pinnatus was conducted using specimens collected by the “Albatross” expedition at a depth of 2,906 m. Despite similarities in external morphology, tegmen and cover plates, the two ptilocrinid species display significant differences in pinnule architecture, aboral cup and stalk articulations. From comparison with Gephyrocrinus messingi n. sp. and Ptilocrinus clarki n. sp., G. grimaldii and P. pinnatus are interpreted as the result of heterochronic development by paedomorphy after ecological or geographic isolation. Pinnule architecture in the two new species suggests first steps in an evolutionary trend toward a rigid box which protects gonad inflation in the proximal part of the pinnule. These new data on Ptilocrinus and Gephyrocrinus create problems in the current taxonomy of the family Hyocrinidae. The main derived characters, especially in pinnule and arm pattern, are used to propose new hypotheses for hyocrinid phylogeny.

On a saddled snake eel Pisodonophis semicinctus (Osteichthyes: Ophichthidae) trawled in the Strait of Sicily (Mediterranean Sea)

2000 ◽  
Vol 80 (5) ◽  
pp. 951-952 ◽  
Author(s):  
Sergio Ragonese ◽  
Giovan Battista Giusto
Keyword(s):  
Body Weight ◽  
Mediterranean Sea ◽  
Bottom Trawl ◽  
Northern Coast ◽  
Rare Finding ◽  
Strait Of Sicily ◽  
Total Length ◽  
The Mediterranean

The occurrence in the Strait of Sicily of the saddled snake eel, Pisodonophis semicinctus (Osteichthyes: Ophichthidae), a rare finding for the Mediterranean Sea, is confirmed on the basis of one specimen caught off the northern coast of Tunisia in 1991. The specimen, 800 mm in total length and 457 g in body weight (preserved condition), was captured during a commercial bottom trawl hauled at 30 m next to Cape Bon (north of Tunisia). This represents the second and fourth documented record of this Atlantic intruder within the Strait of Sicily and the Mediterranean Sea, respectively.

Factors influencing the distribution of Egregia menziesii (Phaeophyta, Laminariales) in British Columbia, Canada

1978 ◽  
Vol 56 (9) ◽  
pp. 1198-1205 ◽  
Author(s):  
D. K. Gordon ◽  
R. E. DE Wreede
Keyword(s):  
British Columbia ◽  
High Temperature ◽  
Laboratory Experiments ◽  
Algal Flora ◽  
The West ◽  
Common Component ◽  
Strait Of Georgia ◽  
Low Salinity ◽  
Factors Influencing ◽  
Juan De Fuca

Egregia menziesii (Turner) Areschoug is a common component of the algal flora along the west coast of Vancouver Island, Queen Charlotte Strait, and the Strait of Juan de Fuca but is absent from the Strait of Georgia in British Columbia, Canada. This distribution pattern was found to be correlated with temperature and salinity in that E. menziesii is not present in areas where there are seasonal periods of low salinity and high temperature. To test this correlation, field transplants of sporophytes and laboratory experiments with sporophytes and culture work were carried out. The results suggest that the distribution of E. menziesii is limited by specific combinations of salinity and temperature; it requires high salinities and temperatures less than 15 °C for its survival.

Breeding characteristics of Townsend's vole (Microtus townsendii) during population fluctuations

1980 ◽  
Vol 58 (4) ◽  
pp. 623-625 ◽  
Author(s):  
Terry D. Beacham
Keyword(s):  
British Columbia ◽  
Sexual Maturity ◽  
Fraser River ◽  
Population Fluctuations ◽  
Peak Density ◽  
Decline Phase ◽  
Early Maturing ◽  
Fraser River Delta ◽  
Peak Phase ◽  
Microtus Townsendii

A 2-year livetrapping study on Townsend's vole (Microtus townsendii) on Reifel Island in the Fraser River delta in British Columbia, Canada, showed that there was an early stop to summer breeding in the peak phase summer compared with the increasing phase summer. Selective dispersal and death of early-maturing voles may account for this result. A delay occurred in the onset of breeding in the decline phase. Voles in peak density populations had the highest median weights at sexual maturity, and males matured at heavier weights than did females.

scholarly journals PERTUMBUHAN LARVA DAN PRODUKSI BENIH IKAN KERAPU BEBEK Cromileptes altivelis Valenciennes, 1828 HASIL BUDIDAYA TURUNAN KE-3

2018 ◽  
Vol 10 (3) ◽  
pp. 589-600
Author(s):  
Regina Melianawati ◽  
Ni Wayan Widya Astuti ◽  
. Tridjoko
Keyword(s):  
Body Weight ◽  
Survival Rate ◽  
Seed Production ◽  
Larval Growth ◽  
The Body ◽  
Third Generation ◽  
Larval Body ◽  
Spine Length ◽  
The Third ◽  
Total Length

ABSTRAKKetersediaan induk dalam suatu usaha pembenihan memiliki peran yang sangat penting. Namun demikian, ketersediaan induk yang berasal dari alam sangat terbatas jumlahnya, sehingga perlu dilakukan penyediaan calon induk yang berasal dari hasil budidaya. Ikan kerapu bebek Cromileptes altivelis Valenciennes, 1828 turunan pertama (F-1) dan turunan kedua (F-2) sudah dapat diproduksi dari hasil budidaya, namun benih turunan ketiga (F-3) belum dapat diperoleh. Penelitian ini bertujuan untuk mendapatkan karakteristik morfologis dan pertumbuhan larva ikan kerapu bebek F-3 sebagai calon induk F-3, serta tingkat keberhasilan produksi benihnya. Pemeliharaan larva dilakukan dalam hatchery hingga larva menjadi benih. Parameter yang diamati meliputi panjang total dan panjang duri sirip larva, berat tubuh larva serta sintasan dan jumlah produksi benih. Hasil penelitian menunjukkan bahwa panjang total larva umur 5, 15, 25 dan 35 hari, masing-masing adalah 3,20±0,07; 4,42±1,11; 8,35±1,12 dan 12,51±3,23 mm. Duri sirip mulai terukur pada larva umur 15 hari. Berat larva umur 30 hari adalah 0,11±0,04 g. Pola pertumbuhan panjang total dan berat tubuh larva adalah eksponensial, sedangkan pola pertumbuhan duri siripnya adalah linier. Masa pemeliharaan larva hingga menjadi benih adalah ± 40 hari. Jumlah benih ikan kerapu bebek F-3 yang diproduksi dalam satu kali siklus pemeliharaan berkisar 440 hingga 2.300 ekor dari 50 ekor induk dan 3 kali siklus pemijahan dengan tingkat kelangsungan hidup 1,30% hingga 8,80%. Hasil penelitian ini mengindikasikan bahwa ikan kerapu bebek F-3 dapat diproduksi dari hasil budidaya seperti halnya pada F-1 dan F-2. ABSTRACTBroodstocks are the most important part of humpback grouper culture, but their availability in nature are limited. Therefore, it is necessary to produce broodstock candidates from culture. The first (F-1) and the second (F-2) generation of humpback grouper have already been produced but the third generation (F-3) production is still on the way. This study was conducted to find out morphological characteristic of the third generation (F-3) of humpback grouper larvae as the candidate of the third generation of broodstock, larval growth and the success rate of seed production. Larvae rearing was done in hatchery until larvae metamorphosed to be seeds. Observed variables including larval total length and spine length, larval body weight, survival rate and the juvenile productions. The study result showed the total length of 5, 15, 25 and 35 days old larvae were 3.20±0.07; 4.42±1.11; 8.35±1.12 and 12.51±3.23 mm, respectively. The spine began measured on 15 days old larvae. The body weight of 30 days old larvae was 0.11±0.04 g. The growth pattern of larval total length and body weight were exponential, while the growth of spine was linear. Rearing period from larvae to juveniles was 40 days. Number of F-3 seed production of humpback grouper produced from once rearing cycle range between 440 and 2,300 fish and the survival rate range from 1.30% up to 8.80%. Therefore, this study could indicate that seed of F-3 humpback grouper can be produced as those of F-1 and F-2.

scholarly journals An investigation of the karyotypes of four species from the genera Setcreasea, Spironema and Tradescantia (Commelinaceae)

2014 ◽  
Vol 58 (4) ◽  
pp. 527-540
Author(s):  
Elżbieta Weryszko-Chmielewska
Keyword(s):  
Tetraploid Species ◽  
Setcreasea Purpurea ◽  
Total Length ◽  
The Family

An investigation was conducted on the number and morphology of the chromosomes of four species from the family <em>Commelinacene</em>:<em> Spironema fragrans </em>Lindl., <em>Setereasea purpurea </em>Boom, <em>Tradesca</em><em>nt</em><em>ia albiflora </em>Kunth. and <em>Tradescantia blossfeldiana </em>Mildbr. It was found that the karyotype of <em>Spironema fragrans </em>Lindl. was 2n = 12 chromo­somes whose total length was 6.9-13.7 µm and the formula of the karyotype was: 2m+2sm +2m+2t+2st<sup>sat</sup> +2st <em>Setcreasea purpurea </em>Boom. had 2n = 24 chromosomes, 9.1-12.1 µm in length and the centromere positioned as represented by the formula 24m. The karyotype of <em>Tradsescantia albiflora </em>Kunth. had 2n = 60 chromosomes whose lengths ranged from 1.4 to 4.5 µm, and is described by the formula: 4sm+6m+10st+10sm+10m+20sm. The complex of chromosomes from <em>Tradescantia blossfeldiana </em>Mildbr. consisted of 2n = 60. Their length was 1.3-4.8 µm. The morphological types of the chromosomes are represented by the formula 6st+2m+2sm+6st+2sm+12m+10M+l4m+6sm. It is suggested on the basis of mor­phological analysis of chromosomes that <em>Setereasea purpurea </em>Boom is a tetraploid species and <em>Trudescantia albiflora </em>Kunth. and T. <em>blossfeldiana </em>Mildbr. are decaploids.

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