Variability and capture efficiency of bongo and Tucker trawl samplers in the collection of ichthyoplankton and other macrozooplankton

1997 ◽  
Vol 54 (4) ◽  
pp. 765-773 ◽  
Author(s):  
P Pepin ◽  
T H Shears
Keyword(s):  
Larval Fish ◽  
Fish Larvae ◽  
Sample Volume ◽  
Capture Efficiency ◽  
Fish Eggs ◽  
Sample Mean ◽  
Sampling Variability ◽  
Wide Range ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

We examined the sampling variability and capture efficiency of bongo nets and a modified Tucker trawl used in the sampling of ichthyoplankton and other macrozooplankton by taking seven replicate samples at each of two stations on two separate occasions. Sample variance was highly significantly related to sample mean for all major taxonomic categories (i.e., fish eggs, fish larvae, crustaceans, and medusae-chaetognaths). Sampling variability of the bongo nets was significantly greater than that of the Tucker trawl for both fish eggs and larvae. Sampling variability of macrozooplankton was significantly greater than that of ichthyoplankton. For larval fish of 5 mm or less, bongo nets generally yielded higher estimates of abundance than the Tucker trawl and the reverse was true for lengths above 10 mm, but there was a significant influence of species-specific morphological characters. The large sample volume of the Tucker trawl relative to the bongo nets resulted in significantly higher estimates of species diversity for fish eggs and larvae but not for crustaceans or medusae. Although bongo and Tucker samplers are efficient at catching a wide range of sizes of larval fish, the latter's lower variability may make it a more effective sampler.

Ichthyoplankton community of the Dardanelles Strait, Turkey

2017 ◽  
Vol 46 (3) ◽  
Author(s):  
İsmail Burak Daban ◽  
Ahsen Yüksek
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Teleost Fish ◽  
Dominant Species ◽  
Fish Larvae ◽  
The Other ◽  
Fish Eggs ◽  
One Year ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

AbstractAn ichthyoplankton survey was conducted between March 2012 and February 2013 along the Anatolian coast of the Dardanelles Strait, with the aim of describing the species composition and temporal variation of fish eggs and larvae. For this purpose, monthly samples were collected at three sites using a WP-2 plankton net equipped with 500 µm mesh during a one-year period. Biodiversity indices were calculated to understand differences in biodiversity. A total of 50 teleost fish species belonging to 25 families and 7 orders were identified. The highest species richness of fish eggs was recorded in spring, whereas the highest species richness of fish larvae – in spring and summer. On the other hand, species richness of fish eggs and larvae were at a minimum in the fall. The most dominant species recorded in the Dardanelles were

scholarly journals Ichthyoplankton distribution and abundance off southeastern and southern Brazil

2004 ◽  
Vol 47 (4) ◽  
pp. 601-612 ◽  
Author(s):  
Débora Martins de Freitas ◽  
José Henrique Muelbert
Keyword(s):  
Coastal Waters ◽  
Fish Larvae ◽  
Bottom Layer ◽  
Brazilian Coast ◽  
Fish Eggs ◽  
Near Shore ◽  
Partial Overlap ◽  
Eggs And Larvae ◽  
Distribution Of Fish ◽  
Fish Eggs And Larvae

This study describes the distribution of fish eggs and larvae along the southeastern and southern Brazilian coast. Plankton samples were collected at 85 stations using a Bongo net, and water salinity and temperature were profiled with a CTD. Results showed that fish eggs and larvae, and zooplankton biovolume were distributed in coastal waters with mean temperature of 23ºC and salinity between 33 and 34. The largest egg abundance occurred along Iguape (24º'S) with a partial overlap with zooplankton biovolume and fish larvae were most abundant near shore close to Santos (24ºS). These protected coastal waters presented a surface layer with lower salinity and higher temperatures, while the bottom layer had cooler water. Ichthyoplankton abundance was low off Cabo Frio (22º'S), while a maximum in fish eggs occurred around Cabo Santa Marta Grande (28ºS).

Chordata: Fish eggs and larvae

2017 ◽  
Author(s):  
Peter Munk ◽  
Jørgen G. Nielsen
Keyword(s):  
Life Cycle ◽  
Tree Of Life ◽  
Fish Eggs ◽  
General Morphology ◽  
Family Level ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

This chapter describes the taxonomy of fish eggs and larvae. Most fish eggs and larvae are planktonic, and are commonly found in plankton net tows. Collectively these fish stages are referred to as ichthyoplankton. The chapter covers their life cycle, ecology, and general morphology. It includes a section that indicates the systematic placement of the taxon described within the tree of life, and lists the key marine representative illustrated in the chapter (usually to genus or family level). This section also provides information on the taxonomic authorities responsible for the classification adopted, recent changes which might have occurred, and lists relevant taxonomic sources.

Relation Between Egg Size, Growth, and Natural Mortality of Larval Fish

1975 ◽  
Vol 32 (12) ◽  
pp. 2503-2512 ◽  
Author(s):  
D. M. Ware
Keyword(s):  
Death Rate ◽  
Egg Size ◽  
Larval Fish ◽  
Juvenile Fish ◽  
Survival Rates ◽  
Fish Eggs ◽  
Trophic Relations ◽  
Size Growth ◽  
Dependent Growth ◽  
Eggs And Larvae

A set of density-dependent growth and survivorship equations is derived from evidence that the instantaneous death rate in the sea is inversely proportional to particle size. The survivorship equation reproduces several well-known phenomena observed in fish populations. It predicts: 1) that winter and spring spawning species ought to produce larger eggs than summer spawners, 2) that it is advantageous for species that spawn in batches to produce progressively smaller eggs in spring and summer, and 3) that the death rate of a cohort of fish should decrease continuously as the survivors grow and approach the critical size.The biological basis for the observed variation in the size of pelagic fish eggs and larvae is thought to be due primarily to trophic relations within the pelagic community. It is suggested from what is known of the relative abundance and foraging capabilities of different sized particles, that the survival rates of larval and juvenile fish should increase as they grow and occupy a progressively higher position in the food chain.

scholarly journals Determining seasonal dominant fish eggs and larvae species groups in the west of Tonkin Gulf

2021 ◽  
Vol 21 (2) ◽  
pp. 171-181
Author(s):  
Huy Pham Quoc ◽  
Minh Nguyen Hoang
Keyword(s):  
Dominant Species ◽  
Species Group ◽  
Fish Eggs ◽  
Time And Space ◽  
The West ◽  
Dominant Fish ◽  
Gulf Of Tonkin ◽  
Species Groups ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

From 2003 to 2016, 1,649 samples were collected, covering both the time and space of the Gulf of Tonkin. The results have identified groups of seasonal dominant fish eggs and larvae: Seven species groups in Spring, nine species groups in the Summer, six species groups in Autumn, and four dominant species groups in the Winter. The dominant index (Yi) ranges from 0.02 to 0.26 depending on the species group and each season of the year, the highest in the Goby group - Gobiidae (Yi = 0.26) achieved in the Spring, followed by Herringgroup - Clupeidae reaches Yi = 0.20 in the Summer and the Anchovy group - Engraulidae reaches Yi = 0.16 in the Summer. The highest advantage index is only Yi = 0.09 in the Winter for Unicorn cod species - Bregmaceros macclelandi. During this period, the number of taxa and dominant indexes tended to decrease from Spring to Winter slightly.

scholarly journals Natural diet and predation impacts ofPelagia noctilucaon fish eggs and larvae in the NW Mediterranean

2016 ◽  
Vol 38 (5) ◽  
pp. 1243-1254 ◽  
Author(s):  
Uxue Tilves ◽  
Jennifer E. Purcell ◽  
Verónica L. Fuentes ◽  
Anna Torrents ◽  
Maria Pascual ◽  
...  
Keyword(s):  
Fish Eggs ◽  
Natural Diet ◽  
Nw Mediterranean ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae
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