Dispersion of vendace eggs and larvae around potential nursery areas reveals their reproductive strategy

2019 ◽  
Vol 64 (5) ◽  
pp. 843-855 ◽  
Author(s):  
Juha Karjalainen ◽  
Janne Juntunen ◽  
Tapio Keskinen ◽  
Saija Koljonen ◽  
Kristiina Nyholm ◽  
...  
Keyword(s):  
Reproductive Strategy ◽  
Nursery Areas ◽  
Eggs And Larvae

scholarly journals Cod’s Journey Back Home—From Birth to Nursery

2021 ◽  
Vol 9 ◽  
Author(s):  
Clarissa Akemi Kajiya Endo ◽  
Frode B. Vikebø ◽  
Natalia A. Yaragina ◽  
Solfrid Sætre Hjøllo ◽  
Leif Christian Stige
Keyword(s):  
Yolk Sac ◽  
Living Conditions ◽  
Ocean Currents ◽  
Adult Fish ◽  
Ocean Water ◽  
Nursery Areas ◽  
Food Reserve ◽  
Eggs And Larvae

Adult cod swim hundreds of kilometers away from home to release their eggs into the ocean water. After some days, tiny larvae hatch from the eggs. At first, the larvae have a small food reserve to sustain them during their first days of life. Soon after emptying the yolk-sac, the larvae must find food on their own. Both eggs and larvae are carried by the ocean currents and they experience large changes in conditions as they drift back to the nursery areas where their parents came from, where the larvae grow up to become adult fish. Our research on cod indicates that the number and location of cod larvae are associated with the size of the spawning adults; and that the number of larvae influences how many cod will grow to be recruits. So, it is important to also know the living conditions of the parents before they spawn, which will be important for the survival of their offspring.

Tailor (Pomatomus saltatrix) off Western Australia: where does it Spawn and how are the Larvae Distributed?

1996 ◽  
Vol 47 (2) ◽  
pp. 337 ◽  
Author(s):  
RC Lenanton ◽  
SG Ayvazian ◽  
AF Pearce ◽  
RA Steckis ◽  
GC Young
Keyword(s):  
Western Australia ◽  
Coastal Currents ◽  
Pomatomus Saltatrix ◽  
Inner Shelf ◽  
Spawning Period ◽  
Nursery Areas ◽  
Eggs And Larvae ◽  
Timing Of Spawning

Tailor is a key finfish resource in Western Australia and is heavily exploited, but there has been no information either on the location and timing of spawning of the species in these waters or on the subsequent distribution and movements of the larvae. The present study has reviewed the literature to elucidate where tailor typically spawn and in which salinities and water temperatures they are most likely to be found. These data have then been collated with new data on the biology of juvenile and adult tailor in Western Australia, and on the salinities, temperatures and water movements off the coast. This has enabled a hypothesis to be developed delineating where spawning is likely to occur in this region and where the larvae are distributed. It is proposed that spawning occurs in inner-shelf waters between spring and autumn. Eggs and larvae are most likely to be transported to coastal nursery areas by wind-driven northward coastal currents that predominate during the main spawning period.

Was That Cheating? Perceptions Vary by Type of Behavior and Reproductive Strategy

2010 ◽  
Author(s):  
Daniel J. Kruger ◽  
Maryanne Fisher ◽  
Sarah L. Strout ◽  
Carey Fitzgerald
Keyword(s):  
Reproductive Strategy ◽  
Type Of Behavior

CURRENT STATE AND DEVELOPMENT PERSPECTIVES OF THE CASPIAN SPRAT FISHERIES

2018 ◽  
pp. 69-75
Author(s):  
Tatiana Vasilievna Pomogaeva ◽  
Aliya Ahmetovna Aseinova ◽  
Yuriy Aleksandrovich Paritskiy ◽  
Vjacheslav Petrovich Razinkov
Keyword(s):  
Food Item ◽  
Growth Potential ◽  
North West ◽  
Marine Fishery ◽  
The North ◽  
Current State ◽  
West Part ◽  
Eggs And Larvae ◽  
Intensive Growth

The article presents annual statistical data of the Caspian Research Institute of Fishery. There has been kept track of the long term dynamics of the stocks of three species of Caspian sprat (anchovy, big-eyed kilka, sprat) and investigated a process of substituting a food item of sprats Eurytemora grimmi to a small-celled copepod species Acartia tonsa Dana. According to the research results, there has been determined growth potential of stocks of each species. Ctenophoran-Mnemiopsis has an adverse effect on sprat population by eating fish eggs and larvae. Ctenophoram - Mnemiopsis is a nutritional competitor to the full-grown fishes. The article gives recommendations on reclamation of stocks of the most perspective species - common sprat, whose biological characteristics helped not to suffer during Ctenophoram outburst and to increase its population during change of the main food item. Hydroacoustic survey data prove the intensive growth of common sprat biomass in the north-west part of the Middle Caspian. According to the results of the research it may be concluded that to realize the volumes of recommended sprat catch it is necessary to organize the marine fishery of common sprat at the Russian Middle Caspian shelf.

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