Contribution to the Biology of Herring (Clupea harengus L.) in Newfoundland Waters

1961 ◽  
Vol 18 (1) ◽  
pp. 31-46
Author(s):  
Steinar Olsen
Keyword(s):  
Growth Rate ◽  
Clupea Harengus ◽  
High Survival ◽  
High Survival Rate ◽  
The South ◽  
Significant Difference ◽  
Class Strength ◽  
Spawning Time ◽  
Traditional Pattern ◽  
Autumn And Winter

A study of the herring of the south and west coasts of Newfoundland in 1957 and 1958 revealed no great fluctuations in relative year-class strength and indicated a fairly high survival rate from the age of recruitment to the fishery.The rate of growth was higher than that found by Tibbo (1956) in 1942–44, and no significant difference in growth rate was demonstrated between the south coast and the region of Bay of, Islands and Port au Port Bay.The study indicated an unusual spread in spawning time with probably peaks in spring, autumn and winter, while prior to about 1950 the Newfoundland herring were apparently all spring spawners. It is suggested that this has caused changes in the traditional pattern of distribution, which have been unfavourable for the herring fishery, and it may also have resulted in an actual decrease in population size.

scholarly journals The Growth of Seriatopora hystrix (Dana, 1846) Transplant with Differences of Fragments Size and Planting Position

Omni-Akuatika ◽  
2021 ◽  
Vol 17 (1) ◽  
pp. 1
Author(s):  
Carissa Paresky Arisagy ◽  
Ratih Ida Adharini ◽  
Eko Setyobudi
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Fragment Size ◽  
Vertical Position ◽  
High Survival ◽  
High Survival Rate ◽  
Significant Difference ◽  
Seriatopora Hystrix ◽  
Horizontal Planting ◽  
Vertical Planting

Transplantation of coral reefs requires sufficient fragments but must still ensure the sustainability of coral donors. This research aimed to know the survival rate and growth rate of transplant corals with different fragment sizes and planting positions and to determine the most effective and efficient transplantation methods of the Seriatopora hystrix. The research was conducted from January to April 2016 in Serangan Island waters Denpasar Bali (1-2 m depth). The method used was a field experiment with variations of planting position (vertical, horizontal) and fragment sizes (3, 5, 7 cm). The results showed a high survival rate (98.3%) of the transplanted S. hystrix with planting position and fragment sizes variation. The variation of planting position and fragment sizes were significantly affected the length growth rate of the S. hystrix (p <0.05). The vertical planting position showed better growth compared to the horizontal planting position. The transplantation of coral with initial fragment sizes of 5 and 7 cm showed a higher growth rate than the fragment size of 3 cm. However, statistical analysis revealed no significant difference between initial fragment sizes of 5 and 7 cm. Therefore, this study demonstrated the most effective and efficient for S. hystrix transplantation showed in the vertical position with the initial fragment size of 5 cm.Key words: coral bleaching, initial fragment, tropical, zooxanthellae

scholarly journals Revegetation of Rock Slopes with Different Substrates in an Abandoned Quarry in Jinju, Korea

2016 ◽  
Vol 8 (3) ◽  
pp. 26
Author(s):  
Ma Hoseop ◽  
Ettagbor Hans Enukwa ◽  
Kang Wonseok ◽  
Kim Choonsig
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Festuca Arundinacea ◽  
High Survival ◽  
Rock Slopes ◽  
High Survival Rate ◽  
Feasible Method ◽  
Leaf Mold ◽  
Dianthus Barbatus ◽  
Target Plant

The purpose of this research was to investigate the use of drilled slanted holes filled with different substrates in the revegetation of rock slopes. Slanted holes were drilled on rock slopes using pneumatic drillers in an abandoned limestone quarry area. These holes were filled with twelve different substrates, treated with Trichoderma harzianum. One climbing plant of Ivy (Hedera rhombea), a native woody plant (Lespedeza cyrtobotrya), three native herbaceous plants (Dianthus barbatus, Siberian chrysanthemum and Aster koraiensis) and one exotic grass plant (Festuca arundinacea) were planted in each of the soils. Six months after planting, only Ivy, Festuca arundinacea, Lespedeza cyrtobotrya and Dianthus barbatus were still observed growing on the soils, while the other plant species had already died in all the 12 soil treatments. Leaf mold soil + 50% Trichoderma harzianum provide the best conditions for revegetation of Festuca arundinacea, as this plant had its highest mean height, high survival rate, with impressive growth rate on this soil. Lespedeza cyrtobotrya also had its most favorable growth on Leaf mold soil + 50% T. harzianum. Mixed soil + 100% T. harzianum provide the best conditions for revegetation of Ivy. Leaf mold soil + 100% T. harzianum provide the best condition for revegetation of Dianthus barbatus as it had its highest mean height, highest growth rate and high survival rate on this soil. Siberian chrysanthemum and Aster koraiensis had the worse results as all of the plants died within a short period of time after planting. Ivy had the highest mean height, followed by Festuca arundinacea. The planted Ivy and Festuca arundinacea now form the vegetation of the research site which together with the substrate is now providing habitat to some wildlife like some species of centipedes, earthworms, insects and wild plants. Less than one year after planting, F. arundinacea already produced flowers and seeds which would further increase the plant population after dispersal and germination. Drilling slanted holes on rock slopes is therefore a feasible method to be used for revegetation and restoration of degraded quarries.The revegetation of steep rock slopes of quarries is a very challenging activity. However, the method of drilling slanted holes on rock slopes is a feasible method to be used for restoration of degraded quarries. These holes could serve in soil deposition and water retention that will further enhance plant growth.Methods of improving seed germination as well as enhancing growth of plants are also imperative in revegetation success of such degraded landscapes. Different percentage mixtures of T. harzianum in different soils could enhance plant growth depending on the target plant species. Different substrates could thus be used in such revegetation process depending on the target plant species.Revegetation would provide habitat and improve landscape beauty and stability, thus it is important for successful restoration of rock slopes 

Growth Kinetic Study on Lyophilized and Cryopreserved Pleurotus sajor-caju Spawn

2015 ◽  
Vol 754-755 ◽  
pp. 1076-1080
Author(s):  
Sharul Aida Mohd Shayuti ◽  
Shi Fern Chong ◽  
Zarina Zakaria ◽  
Dachyar Arbain ◽  
Noorulnajwa Diyana Yaacob
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Doubling Time ◽  
Specific Growth ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Maximum Specific Growth Rate ◽  
High Survival ◽  
Significant Difference ◽  
Preservation Technique

A study was conducted to determine the most optimal preservation technique for P. sajor-caju spawns which produce maximum specific growth rate and shortest doubling time by using contois kinetic model. The analyzed experimental data showed that lyophilized P. sajor-caju spawn showed the highest maximum specific growth rate, and shortest doubling time compared to cryopreserved P. sajor-caju spawn and 4oC stored P. spawn. There was no significant difference in aspect of growth rate between the lyophilization and cryopreservation techniques which were; 0.148 (μmax)/ (g/day) and 0.147(μmax)/ (g/day) respectively. Based on the result, lyophilization technique was considered as the best preservation technique for preserving P. sajor-caju spawn due to high maximum growth rate which indicates high survival after exposure to preservation treatment.

scholarly journals Survival of Prosthodontic Restorations Luted with Resin-Based versus Composite-Based Cements: Retrospective Cohort Study

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 312
Author(s):  
Ján Staněk ◽  
Abanoub Riad ◽  
Adam Le ◽  
Matěj Bernát ◽  
Milad Hammal ◽  
...  
Keyword(s):  
Survival Rate ◽  
Survival Rates ◽  
High Viscosity ◽  
High Survival ◽  
High Survival Rate ◽  
Secondary Caries ◽  
Posterior Teeth ◽  
Tooth Structure ◽  
Significant Difference ◽  
Indirect Composite

The purpose of this study was to evaluate clinical performance, survival, and complications of indirect composite inlays, onlays, and overlays on posterior teeth. Digital records of 282 patients treated between 2014 and 2018 were accessed and analyzed retrospectively. The included patients received 469 composite restorations luted with seven different resin-based types of cement, i.e., Filtek Ultimate Flow, Enamel Plus, Relyx Ultimate, Harvard Premium Flow, Relyx Unicem, Filtek Bulk Fill Flowable, and Filtek Ultimate. The restorations had been clinically and radiographically evaluated annually. The mechanical and clinical complications, e.g., debonding, fracture, and secondary caries, were evaluated and recorded. The examined restorations exhibited a high survival rate (84.9%), and failure was found in only 71 cases. Fracture was the most common cause (n = 36), followed by prosthetic work release (n = 19) and secondary caries (n = 16). There was a statistically significant difference between failure and cement material (Sig. < 0.001); the composite-based cements (87.2%) had a high survival rate compared to the resin-based cement (72.7%). Similarly, the cements with high viscosity (90.2%) had significantly higher survival rates than the low-viscosity cements (78.9%). Moreover, onlays showed higher longevity compared to overlays (Sig. = 0.007), and patients aged under 55 years showed less complications (Sig. = 0.036). Indirect composite restoration was a successful solution to tooth structure loss. The material of the cementation is an important part of the success. Higher survival rate was found in our study when the fixation materials with high viscosity were used, thus suggesting using these materials with indirect restorations. Composite-based cements had significantly higher survival rate than resin-based cements.

Growth and carcass characteristics of crossbred and straightbred Hereford steers. I. Post-weaning growth

1981 ◽  
Vol 32 (1) ◽  
pp. 161 ◽  
Author(s):  
JM Thompson ◽  
R Barlow ◽  
B Johnston ◽  
PJ Nicholls
Keyword(s):  
Growth Rate ◽  
Slow Growth ◽  
Carcass Characteristics ◽  
Late Summer ◽  
Coastal Environment ◽  
Early Summer ◽  
Significant Difference ◽  
The Mean ◽  
The Difference ◽  
Autumn And Winter

Post-weaning growth characteristics were examined in 28 Hereford, 27 Brahman x Hereford, 23 Simmental x Hereford and 26 Friesian x Hereford steers which were grazed on pasture in a central coastal environment at Paterson, N.S.W. Sixty-seven steers from a 1973 calving were allocated to three groups to be slaughtered when the mean liveweights of the Herefords were approximately 270, 370 and 470 kg. Thirty-seven steers from a 1974 calving were allocated to two groups to be slaughtered when the average liveweights of the Herefords were 470 and 570 kg. Average daily liveweight gains of the crossbred steers were greater (average 19%) than the Hereford steers from weaning to the four slaughter weights (P < 0.05). Of the crossbreds, the Brahman cross steers grew faster than the Simmental cross steers (P < O.05), although the difference was not significant at the highest slaughter weight. The growth advantage of the crossbreds was mainly realized in the periods of slow growth (mean growth rate of 320 g/day) during the late summer, autumn and winter months. During these periods the Brahman cross steers grew faster than the Herefords by an average of 89% (P < 0.05) and the Simmental and Friesian cross steers grew 39% faster than the Herefords (P < 0.05). In the periods of fast growth (mean growth rate of 667 g/day), during the spring and early summer months, there was no significant difference between the sire breeds in growth rate (P > 0.05).

scholarly journals Efektifitas penggunaan bingkai jaring pada penjarangan benih kerang mutiara, Pinctada maxima

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Pitjont Tomatala
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Shell Growth ◽  
Economic Value ◽  
Normal Growth ◽  
International Market ◽  
Pearl Oyster ◽  
High Survival ◽  
High Survival Rate ◽  
Pinctada Maxima

Abstract Pearl oyster Pinctada maxima is  one of the sea resource that has an economic value in national and international market.  Recently, many companies  have succeeded in producing hundreds of  thousand spat through hatchery. However,  mortality rate of spat in rearing activityies in the sea was remain high. It was caused by unfavorable handling of spat during the spacing process. The purpose of this research was evaluate the effectiveness of using frame net in spat handling at spacing process. This research was conducted at Luv Bay of Tual City, Maluku Province on March to April 2012. The observation was conducted to measure the shell growth and survaival of  P. maxima spat. The result suggested that the use of frame net in the spacing  process of pearl oyster had great advantage. It was proven by the normal growth and high survival rate.   Keywords : Pinctada maxima, spat, growth rate, survaival rate

Growth of Larval Herring (Clupea harengus) in the Bay of Fundy and Gulf of Maine area

1972 ◽  
Vol 29 (5) ◽  
pp. 573-575 ◽  
Author(s):  
Naresh Das
Keyword(s):  
Growth Rate ◽  
Gulf Of Maine ◽  
Early Summer ◽  
Clupea Harengus ◽  
Bay Of Fundy ◽  
Initial Growth ◽  
Late Autumn ◽  
Initial Growth Rate ◽  
Autumn And Winter

Initial growth rate for autumn-hatched herring larvae in the Bay of Fundy–Gulf of Maine area is about 2 mm per week. It gradually declines to less than 1 mm per week during the late autumn and winter months, and then increases geometrically in the spring and early summer to an average of 2.5 mm per week.

Some Speculations about the Baltic Herring (Clupea harengus membras) in Connection with the Eutrophication of the Baltic Sea

1985 ◽  
Vol 42 (S1) ◽  
pp. s83-s90 ◽  
Author(s):  
G. Aneer
Keyword(s):  
Baltic Sea ◽  
Clupea Harengus ◽  
Filamentous Algae ◽  
The Baltic Sea ◽  
Baltic Herring ◽  
Significant Difference ◽  
Spawning Time ◽  
Low Levels ◽  
The Baltic

In this paper the hypothesis is put forward that Baltic herring (Clupea harengus membras) spawning time, spring or autumn, is determined by feeding conditions during the adult phase and thus not genetically fixed. The present "absence" of autumn spawners is thought to be the result of improved feeding conditions during the latest decades as a result of the eutrophication of the Baltic Sea. During two spawning ground studies carried out in 1978 and 1982 unusually high mortality rates were noted for eggs in situ. In 1982, during 4 wk close to peak of spawning, the mortality increased substantially, especially for eggs among filamentous algae. A significant difference was noted between eggs on coarser algae and those among filamentous algae (p < 0.001). During this period the average mortalities were 33 and 75%, respectively. Very low levels of oxygen were measured at night among the filamentous algae. An increase in the amounts of this type of algae as a response to the eutrophication might constitute a new hazard to the reproductive success of the Baltic herring.

Discreteness of Atlantic Herring (Clupea harengus harengus) Populations in Spring and Autumn Fisheries in the Southern Gulf of St. Lawrence

1971 ◽  
Vol 28 (7) ◽  
pp. 1009-1014 ◽  
Author(s):  
S. N. Messieh ◽  
S. N. Tibbo
Keyword(s):  
Growth Rate ◽  
Clupea Harengus ◽  
Atlantic Herring ◽  
Frequency Distributions ◽  
Dorsal Fin ◽  
Class Composition ◽  
Fin Rays ◽  
Spawning Time ◽  
Clupea Harengus Harengus

Evidence was obtained that spring and autumn herring fisheries in the southern Gulf of St. Lawrence are supported by two discrete stocks. Samples from the two fisheries taken in 1965 through 1969 differed in length- and age-frequency distributions, year-class composition, growth rate, spawning time, and mean numbers of pectoral and dorsal fin rays.

scholarly journals Assessment of the Growth and Reproductive Performance of Cloned Pietrain Boars

Animals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2053
Author(s):  
Junsong Shi ◽  
Baohua Tan ◽  
Lvhua Luo ◽  
Zicong Li ◽  
Linjun Hong ◽  
...  
Keyword(s):  
Growth Rate ◽  
Body Size ◽  
Growth Performance ◽  
Reproductive Performance ◽  
Semen Quality ◽  
Small Body ◽  
Economic Benefits ◽  
Large Animal ◽  
Significant Difference ◽  
F1 Progeny

How to maximize the use of the genetic merits of the high-ranking boars (also called superior ones) is a considerable question in the pig breeding industry, considering the money and time spent on selection. Somatic cell nuclear transfer (SCNT) is one of the potential ways to answer the question, which can be applied to produce clones with genetic resources of superior boar for the production of commercial pigs. For practical application, it is essential to investigate whether the clones and their progeny keep behaving better than the “normal boars”, considering that in vitro culture and transfer manipulation would cause a series of harmful effects to the development of clones. In this study, 59,061 cloned embryos were transferred into 250 recipient sows to produce the clones of superior Pietrain boars. The growth performance of 12 clones and 36 non-clones and the semen quality of 19 clones and 28 non-clones were compared. The reproductive performance of 21 clones and 25 non-clones were also tested. Furthermore, we made a comparison in the growth performance between 466 progeny of the clones and 822 progeny of the non-clones. Our results showed that no significant difference in semen quality and reproductive performance was observed between the clones and the non-clones, although the clones grew slower and exhibited smaller body size than the non-clones. The F1 progeny of the clones showed a greater growth rate than the non-clones. Our results demonstrated through the large animal population showed that SCNT manipulation resulted in a low growth rate and small body size, but the clones could normally produce F1 progeny with excellent growth traits to bring more economic benefits. Therefore, SCNT could be effective in enlarging the merit genetics of the superior boars and increasing the economic benefits in pig reproduction and breeding.

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