Broodstock diet with water and astaxanthin improve condition and egg output of brood fish and larval survival in Atlantic cod,Gadus morhuaL.

2014 ◽  
Vol 47 (3) ◽  
pp. 819-829 ◽  
Author(s):  
Øyvind J. Hansen ◽  
Velmurugu Puvanendran ◽  
Rama Bangera
Keyword(s):  
Atlantic Cod ◽  
Larval Survival ◽  
Broodstock Diet ◽  
Brood Fish ◽  
Improve Condition

The influence of maternal effects in larval survival on fishery harvest reference points for two life-history patterns

2014 ◽  
Vol 71 (1) ◽  
pp. 151-161 ◽  
Author(s):  
Paul D. Spencer ◽  
Sarah B.M. Kraak ◽  
Edward A. Trippel
Keyword(s):  
Life History ◽  
Pacific Ocean ◽  
Maternal Effects ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Larval Survival ◽  
Reference Points ◽  
Life History Pattern ◽  
Gadus Macrocephalus ◽  
Potential Interactions

Increased larval viability with increased spawner age (i.e., maternal effects) have been observed in Atlantic cod (Gadus morhua) and Pacific rockfish (Sebastes spp.) stocks. Analytical results from a Beverton–Holt recruitment model indicate density-independent maternal effects affected the relative stock productivity and fishing rate reference points. We simulated populations based on Pacific cod (Gadus macrocephalus) and Pacific ocean perch (Sebastes alutus) to explore how estimates of reference points Fmsy and Fcrash are affected by maternal effects and potential interactions with life-history pattern, recruitment autocorrelation, and exploitation rate. Estimates of Fmsy and Fcrash were made from populations with maternal effects using either total larvae (proportional to eggs) or viable larvae (incorporating the maternal effect). Maternal effects have the largest impact upon estimated population productivity at high fishing rates. Estimates of Fmsy and Fcrash for cod were also affected by autocorrelated recruitment variability because of their reduced longevity compared with Pacific ocean perch. These results suggest the importance of evaluating the influence of maternal effects on estimated stock productivity on a case-by-case basis, particularly for depleted stocks composed of relatively young spawners.

Influence of broodstock diet on somatic growth, fecundity, gonad carotenoids and larval survival of sea urchin

2013 ◽  
Vol 46 (4) ◽  
pp. 969-976 ◽  
Author(s):  
Stefano Carboni ◽  
Adam D. Hughes ◽  
Tim Atack ◽  
Douglas R. Tocher ◽  
Herve Migaud
Keyword(s):  
Sea Urchin ◽  
Somatic Growth ◽  
Larval Survival ◽  
Broodstock Diet

scholarly journals Using probiotics in freshwater larviculture

2019 ◽  
Vol 27 (3) ◽  
pp. 130-135 ◽  
Author(s):  
Barbara Kazuń ◽  
Krzysztof Kazuń
Keyword(s):  
Side Effects ◽  
Environmental Impact ◽  
Larval Survival ◽  
Significant Component ◽  
Preventative Measures ◽  
Negative Environmental Impact ◽  
Brood Fish

Abstract Probiotics have become a significant component of aquaculture in recent years. The use of antibiotics is decreasing successively because of their side effects in animals and their negative environmental impact, which is why alternative preventative measures are being sought. Probiotics that are effective in this field are playing increasingly important roles in safeguarding the health of fish and also as growth stimulants. The application of probiotics can help to successfully control the occurrence of disease in hatcheries, increase larval survival, and improve rearing parameters thanks to which the number of required brood-fish, which are expensive to maintain, can be reduced.

scholarly journals Ocean Acidification Effects on Atlantic Cod Larval Survival and Recruitment to the Fished Population

PLoS ONE ◽  
2016 ◽  
Vol 11 (8) ◽  
pp. e0155448 ◽  
Author(s):  
Martina H. Stiasny ◽  
Felix H. Mittermayer ◽  
Michael Sswat ◽  
Rüdiger Voss ◽  
Fredrik Jutfelt ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Atlantic Cod ◽  
Larval Survival

scholarly journals Effect of enriched rotifers on growth, survival, and composition of larval Atlantic cod (Gadus morhua)

2006 ◽  
Vol 63 (2) ◽  
pp. 285-295 ◽  
Author(s):  
Heum Gi Park ◽  
Velmurugu Puvanendran ◽  
Anne Kellett ◽  
Christopher C. Parrish ◽  
Joseph A. Brown
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Dry Weight ◽  
Larval Survival ◽  
High Ratio ◽  
Oil Emulsion ◽  
Growth And Survival ◽  
Whole Cells ◽  
Atlantic Cod Larvae ◽  
Spray Dried

Abstract Recently, the nutritional requirements of marine finfish larvae have received considerable attention, and studies have shown that docosahexaenoic acid (DHA) affects the growth and survival of marine finfish larvae. We investigated the effects of different rotifer diets containing variable amounts of DHA on the growth and survival of larval Atlantic cod (Gadus morhua L.). Four different commercial rotifer enrichment formulations were used: spray-dried whole cells composed of Crypthecodinium sp. (ED1), spray-dried whole cells of Schizochytrium sp. (ED2), an oil emulsion (ED3) and ED1, and dried Chlorella at a 7:3 ratio by weight (ED4). The resultant rotifers contained a similar concentration of DHA (1.1–1.6% DW), but the level of DHA differed in proportion to EPA for each enrichment, and was designated ER1–4. Twelve 30-l aquaria were used with three replicates per treatment. Larvae were fed with rotifers from 3 to 43 days post-hatch (dph) at 4000 prey l−1. At the end of the experiment, no significant differences were found in body length and dry weight between the larvae reared on ER1 and ER2. However, larvae reared on ER3 were significantly smaller (both in length and weight) than larvae reared on ER1 and ER2. Larval survival on the ER2 treatment at 43 dph was significantly higher than on the other three treatments. Our results showed a positive effect of rotifer DHA proportions on growth and survival of cod larvae, and demonstrated that Atlantic cod larvae require a high ratio of dietary DHA to EPA.

Effects of bacterial treatment at early stages of Atlantic cod (Gadus morhuaL.) on larval survival and development

2010 ◽  
Vol 108 (2) ◽  
pp. 624-632 ◽  
Author(s):  
H.L. Lauzon ◽  
S. Gudmundsdottir ◽  
A. Steinarsson ◽  
M. Oddgeirsson ◽  
S.K. Petursdottir ◽  
...  
Keyword(s):  
Atlantic Cod ◽  
Larval Survival ◽  
Early Stages ◽  
Survival And Development ◽  
Bacterial Treatment

scholarly journals Induced Spawning of Sahar, Tor putitora (Hamilton-Buchanan) in Terai Region of Nepal

ZOO-Journal ◽  
2019 ◽  
Vol 5 ◽  
pp. 1-6
Author(s):  
Jay D Bista ◽  
Rahul Ranjan ◽  
Narayan P Pandit ◽  
Madhav K Shrestha ◽  
James S Diana
Keyword(s):  
Body Weight ◽  
Crude Protein ◽  
Natural Waters ◽  
Natural Habitat ◽  
Survival Rates ◽  
Larval Survival ◽  
Tor Putitora ◽  
Protein Feed ◽  
Brood Fish ◽  
Female Brood

Sahar, Tor putitora (Hamilton-Buchanan) is a high valued indigenous riverine species of Nepal. This is declining in its natural habitat. Tor putitora and Tor tor (Hamilton-Buchanan) have been recommended as vulnerable and endangered species. Limited seed production using natural propagation has restricted its expansion in culture as well as rehabilitation in natural waters. The artificial propagation of sahar using synthetic hormone was conducted in Pokhara, AFU, Chitwan and CARP), Kathar during February to April 2017. Sixty five male (0.5-1.8 kg) and forty five female (1.1-2.1 kg) brood fish were reared in 200 m2 earthen ponds at 1000 kg/ha. Fish were fed with 32% crude protein feed at 3% body weight per day. Maturity was observed regularly for softness of the abdomen. Female brood fish with a soft and extended abdomen were injected with synthetic hormone (Ovaprim) at 0.5 ml/kg body weight. Males were not injected hormone. The fertilized eggs were incubated in Atkin hatching trays. A total of 16 females were induced to spawn, and they produced 1630.80±184.30 (mean±SE) eggs per kg body weight. Mean hatching and larval survival rates were 78.4±1.9 and 74.7±1.1%, respectively.

scholarly journals Turbulence enhances feeding of larval cod at low prey densities

2014 ◽  
Vol 71 (9) ◽  
pp. 2515-2529 ◽  
Author(s):  
T. Kristiansen ◽  
K. W. Vollset ◽  
S. Sundby ◽  
F. Vikebø
Keyword(s):  
Vertical Distribution ◽  
Growth Rates ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Larval Fish ◽  
Larval Survival ◽  
Growth And Survival ◽  
First Feeding ◽  
High Ingestion ◽  
Biological Environment

Abstract The ability of larval fish to find food successfully after hatching is critical for their growth and survival during the early life stages. However, the feeding ecology of larval fish is strongly dependent on prevailing physical and biological conditions. Small changes in the prey distribution, turbulence, light, and ocean temperature can affect larval survival probabilities. This study combined physical and biological observations collected from Atlantic cod (Gadus morhua) spawning grounds from Lofoten, Norway, during the years 1991–1992 with an individual-based model (IBM) that is able to simulate behaviour, feeding, and growth. Observational data on the vertical distribution of larval cod revealed that they congregated at 10–25 m during the day, although the highest abundance of prey was generally in the upper 10 m. Using the behavioural component of the IBM, we analysed the mechanistic interactions between larval bioenergetics and the physical–biological environment and compared modelled with observed vertical larval cod distribution. During periods of both low and high prey densities, turbulence had a significant impact on larval cod feeding and growth rates as well as on larval vertical distribution. At low prey abundance (<5 nauplii l−1), turbulence enhanced encounter rates were very important for sustaining ingestion and growth rates for first-feeding larval cod. Our results suggest that turbulence allowed larval cod to sustain high ingestion rates even deeper in the water column, where prey densities are usually lower.

Effects of temperature on life history set the sensitivity to fishing in Atlantic cod Gadus morhua

2014 ◽  
Vol 514 ◽  
pp. 217-229 ◽  
Author(s):  
HY Wang ◽  
LW Botsford ◽  
JW White ◽  
MJ Fogarty ◽  
F Juanes ◽  
...  
Keyword(s):  
Life History ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Effects Of Temperature

The box-balance model: a new tool to assess fish larval survival, applied to field data on two small pelagic fish

2020 ◽  
Vol 650 ◽  
pp. 289-308 ◽  
Author(s):  
V Raya ◽  
J Salat ◽  
A Sabatés
Keyword(s):  
Field Data ◽  
Fish Larvae ◽  
Larval Growth ◽  
Warming Trend ◽  
Mortality Rates ◽  
Larval Survival ◽  
Pelagic Fish ◽  
Balance Model ◽  
Small Pelagic Fish ◽  
Mesoscale Structures

This work develops a new method, the box-balance model (BBM), to assess the role of hydrodynamic structures in the survival of fish larvae. The BBM was applied in the northwest Mediterranean to field data, on 2 small pelagic fish species whose larvae coexist in summer: Engraulis encrasicolus, a dominant species, and Sardinella aurita, which is expanding northwards in relation to sea warming. The BBM allows one to quantify the contribution of circulation, with significant mesoscale activity, to the survival of fish larvae, clearly separating the effect of transport from biological factors. It is based on comparing the larval abundances at age found in local target areas, associated with the mesoscale structures (boxes), to those predicted by the overall mortality rate of the population in the region. The application of the BBM reveals that dispersion/retention by hydrodynamic structures favours the survival of E. encrasicolus larvae. In addition, since larval growth and mortality rates of the species are required parameters for application of the BBM, we present their estimates for S. aurita in the region for the first time. Although growth and mortality rates found for S. aurita are both higher than for E. encrasicolus, their combined effect confers a lower survival to S. aurita larvae. Thus, although the warming trend in the region would contribute to the expansion of the fast-growing species S. aurita, we can confirm that E. encrasicolus is well established, with a better adapted survival strategy.

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