Sexual dimorphism in purple mud crab, Scylla tranquebarica , early juvenile stage

2021 ◽  
Author(s):  
Ariffin Hidir ◽  
Mohd Amran Aaqillah‐Amr ◽  
Muda Mohd‐Sabri ◽  
Ibrahim Mohd‐Zaidi ◽  
Md Sheriff Shahreza ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Juvenile Stage ◽  
Mud Crab ◽  
Early Juvenile ◽  
Early Juvenile Stage

Effects of Some Aspects of Environment on the Distribution of Juvenile Herring in Barkley Sound

1959 ◽  
Vol 16 (3) ◽  
pp. 283-308 ◽  
Author(s):  
Alan S. Hourston
Keyword(s):  
Food Supply ◽  
Juvenile Stage ◽  
Spawning Grounds ◽  
Early Juvenile ◽  
Barkley Sound ◽  
Early Juvenile Stage

During the early juvenile stage, the herring in Barkley Sound move from the spawning grounds, mainly on the northwest side of the sound, to rearing grounds mainly on the southeast side. From a study of the distribution abundance and environment of the juveniles, it would appear that the herring were neither carried across the sound by prevailing currents nor were they simply following their food supply. The fish appear to have dispersed and gradually collected in the sheltered bays, inlets and channels, which are more numerous on the southeast side. Juvenile habitats generally had shallow thermoclines, medium salinities and below average zooplankton concentrations but these factors did not appear to affect the distribution of the juveniles directly.

scholarly journals EFFECTS OF DIFFERENT TYPES OF FEED ON GROWTH, SURVIVAL AND DIGESTIVE ENZYME ACTIVITY OF EARLY JUVENILE-STAGE MARBLE GOBY, Oxyeleotris marmoratus

2008 ◽  
Vol 3 (1) ◽  
pp. 29
Author(s):  
Muhammad Darwis ◽  
Sitti Raehana Muhd. Shaleh ◽  
Masaru Tanaka ◽  
Shigeharu Senoo
Keyword(s):  
Enzyme Activity ◽  
Seed Production ◽  
Digestive Enzyme ◽  
Juvenile Stage ◽  
Production Technique ◽  
Early Juvenile ◽  
Early Juvenile Stage ◽  
Trash Fish ◽  
Different Types ◽  
Oxyeleotris Marmoratus

The stable mass seed production technique of marble goby, Oxyeleotris marmoratus has not yet been established due to high mortality occurring on the early juvenile stage and/or after 40 days after hatching (d AH). In order to establish the mass seed production technique, O. marmoratus juveniles of 40 d AH were reared for 60 days to determine growth, survival and digestive enzyme activity at different types of feed (trash fish, artificial feed and Artemia sp. nauplii). Specific growth rate (5.32) and survival rate (91.3%) in juveniles fed Artemia sp. nauplii showed significantly higher (P<0.05) than those of juveniles fed trash fish and artificial feed. At the end of the experiment, the mean specific trypsin, amylase and lipase activities of juveniles fed Artemia sp. nauplii were recorded as 0.04 mU mg protein-1m-1, 0.114 mg maltose mg protein-1h-1 and 9.58 m Units, respectively, and they were significantly higher than those of juveniles fed trash fish and artificial feed. In the present study it was shown that O. marmoratus early juveniles had more efficient digestibility and absorption the nutrient when fed with Artemia.

scholarly journals A novel length back-calculation approach accounting for ontogenetic changes in the fish length – otolith size relationship during the early life of sprat (Sprattus sprattus)

2012 ◽  
Vol 69 (7) ◽  
pp. 1214-1229 ◽  
Author(s):  
Claudia C. Günther ◽  
Axel Temming ◽  
Hannes Baumann ◽  
Bastian Huwer ◽  
Christian Möllmann ◽  
...  
Keyword(s):  
Calculation Method ◽  
Juvenile Stage ◽  
Growth Potential ◽  
Fish Length ◽  
Ontogenetic Changes ◽  
Sprattus Sprattus ◽  
Early Juvenile ◽  
Length Growth ◽  
Early Juvenile Stage ◽  
Back Calculation

An individual-based length back-calculation method was developed for juvenile Baltic sprat ( Sprattus sprattus ), accounting for ontogenetic changes in the relationship between fish length and otolith length. In sprat, metamorphosis from larvae to juveniles is characterized by the coincidence of low length growth, strong growth in body height, and maximal otolith growth. Consequently, the method identifies a point of metamorphosis for an individual as the otolith radius at maximum increment widths. By incorporating this information in our back-calculation method, estimated length growth for the early larval stage was more than 60% higher compared with the result of the biological intercept model. After minimal length growth during metamorphosis, we found the highest increase in length during the early juvenile stage. We thus located the strongest growth potential in the early juvenile stage, which is supposed to be critical in determining recruitment strength in Baltic sprat.

Ontogenetic diet shift in the June sucker Chasmistes liorus (Cypriniformes, Catostomidae) in the early juvenile stage

2010 ◽  
Vol 19 (3) ◽  
pp. 433-438 ◽  
Author(s):  
J. D. Kreitzer ◽  
M. C. Belk ◽  
D. B. Gonzalez ◽  
R. C. Tuckfield ◽  
D. K. Shiozawa ◽  
...  
Keyword(s):  
Juvenile Stage ◽  
Diet Shift ◽  
Early Juvenile ◽  
Ontogenetic Diet Shift ◽  
Early Juvenile Stage ◽  
June Sucker ◽  
Chasmistes Liorus

scholarly journals The ‘lost years’ of green turtles: using stable isotopes to study cryptic lifestages

2007 ◽  
Vol 3 (6) ◽  
pp. 712-714 ◽  
Author(s):  
Kimberly J Reich ◽  
Karen A Bjorndal ◽  
Alan B Bolten
Keyword(s):  
Stable Isotopes ◽  
Green Turtle ◽  
Chelonia Mydas ◽  
Juvenile Stage ◽  
Fish Scales ◽  
Ontogenetic Shift ◽  
Early Juvenile ◽  
Carbon And Nitrogen ◽  
Green Turtles ◽  
Early Juvenile Stage

Ignorance of the location or inaccessible locations of lifestages can impede the study and management of species. We used stable isotopes of carbon and nitrogen to identify the habitats and diets and to estimate the duration of a ‘missing’ lifestage: the early juvenile stage of the green turtle, Chelonia mydas . Stable isotopes in scute from young herbivorous green turtles in shallow-water habitats revealed that they spend 3–5 years as carnivores in oceanic habitats before making a rapid ontogenetic shift in diet and habitat. Stable isotopes in persistent and continuously growing tissues, such as some fish scales, bird bills and claws and mammal hair and claws, can be used to evaluate the ecology of inaccessible lifestages.

Composition, seasonality and distribution of Ichthyoplankton in Port Phillip Bay, Victoria

1986 ◽  
Vol 37 (4) ◽  
pp. 507 ◽  
Author(s):  
GP Jenkins
Keyword(s):  
Central Region ◽  
Fish Larvae ◽  
Northern Region ◽  
Juvenile Stage ◽  
Larval Abundance ◽  
Summer Period ◽  
Early Juvenile ◽  
Positive Correlation ◽  
Spring Period ◽  
Early Juvenile Stage

Plankton samples were collected on monthly cruises over 1 year from May 1983 to April 1984, to investigate composition, seasonality and distribution of ichthyoplankton in Port Phillip Bay. Fish egg numbers were dominated by the southern anchovy, Engraulis australis; clupeoids and gobiids were co-dominant larvae. Other common fish larvae were the cobbler, Gymnapistes marmoratus, greenback flounder, Rhombosolea tapirina, and callionymids. Egg abundances were highest in summer, resulting mainly from high abundances of E. australis eggs. Abundances of fish larvae were highest in summer and winter-spring. The summer period was dominated by clupeoid and gobiid larvae, together with callionymids, monacanthids, platycephalids, the blenny, Pictiblennius tasmanianus, the snapper, Chrysophrys auratus, and a number of rarer species. The winter-spring period was almost entirely dominated by four taxa: gobiids, G. marmoratus, R. taplrina and the long-snouted flounder, Ammotretis rostratus. Eggs of E. australis, Sardinops neopilchardus and A. rostratus, and larvae of all common taxa except monacanthids and C. auratus, were distributed widely throughout the bay. Abundance of eggs of E. australis at the mouth of the bay was significantly lower than within the bay proper. Larvae of P. tasrnanianus were significantly more abundant in the shallow, northern region of the bay than in the deeper, central region. Most monacanthid larvae were collected towards the mouth of the bay, whereas C. auratus larvae were only collected at stations well inside the bay. Analysis of winter samples revealed multispecies patchiness of fish larvae, and a positive correlation between larval abundance and volume of net zooplankton. Although juveniles of King George whiting, Sillaginodes punctatus, and yellow-eyed mullet, Aldrichetra forsteri, are abundant in Port Phillip Bay, larvae were virtually absent. It is proposed that these species spawn offshore, and that immigration into the bay occurs at a late larval-early juvenile stage not detectable by plankton sampling.

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