scholarly journals Recruitment patterns of freshwater amphidromous fishes (Pisces: Gobiidae, Eleotridae) to the Cimaja estuary, Palabuhanratu Bay

2021 ◽  
Vol 21 (3) ◽  
pp. 321-337
Author(s):  
Charles P.H Simanjuntak ◽  
Faqih Baihaqi ◽  
Tri Prabowo ◽  
Shafira Bilqis A ◽  
Sulistiono Sulistiono ◽  
...  
Keyword(s):  
Rainy Season ◽  
Tidal Cycle ◽  
Fish Larvae ◽  
River Estuary ◽  
Early Morning ◽  
Juvenile Stage ◽  
Recruitment Process ◽  
Recruitment Pattern ◽  
Larval Recruitment ◽  
Larvae And Juveniles

The sustainability of amphidromous fishes is determined by the success of the larval recruitment process from marine to freshwaters habitats. This study aimed to determine the recruitment pattern of freshwater amphidromous fish to the Cimaja River estuary, Palabuhanratu Bay in terms of season and daily. Amphidromous fish were caught monthly on the 25th of Hijri or waning crescent from December 2020 to August 2021. Sampling in one whole day with observation intervals every 4 hours was carried out in June 2021 to reveal the time of larvae and juveniles of the amphidromous fish recruit to the Cimaja River estuary. A total of 13 species of amphidromous fishes representing five genera and two families was captured. The recruitment of amphidromous fishes into the Cimaja River occurs between the peak of the rainy season to dry season. Generally, amphidromous recruit into the estuary waters of the Cimaja River is at the juvenile stage (11.9-21.8 mm body length). However, the recruitment of some amphidromous fish species appears at the postflexion stage (6.9-11.9 mm BL). Based on diel observations, larvae and juveniles of amphidromous fish are generally preferred to recruit to the Cimaja River estuary in the early morning (03:00 am) and afternoon (03:00 pm). Recruitment of amphidromous fish larvae to the Cimaja River follows a semi-diurnal tidal cycle which is a tidal type in Palabuhanratu Bay. Amphidromous fishes use tidal flux to recruit and migrate upstream of the Cimaja River through estuaries.

Structure and dynamics of Gobiidae larvae (Teleostei, Perciformes) in a tropical estuary: seasonal relationships with tidal cycles

2014 ◽  
Vol 94 (7) ◽  
pp. 1557-1568 ◽  
Author(s):  
Eduardo A.P. Gomes ◽  
Ana C.T. Bonecker
Keyword(s):  
Rainy Season ◽  
Fish Larvae ◽  
Abiotic Factors ◽  
River Estuary ◽  
River Mouth ◽  
Temporal Distribution ◽  
Mesh Size ◽  
Distribution Patterns ◽  
Flood Tide ◽  
Estuarine System

This study aims to describe the spatial and temporal distribution patterns of Gobiidae larvae at a tropical estuarine system in south-east Brazil (Macaé). The samples were collected in six stations, through oblique hauls using a bongo net (330 µm mesh size), coupled to a flowmeter, during the night in the ebb and flood tides in March, July and October 2006 and in February 2007. In the Macaé River estuary was collected a total of 1,234 Gobiidae larvae, representing nine taxa. The highest densities occurred in the river mouth during the flood tide in the rainy season. The most abundant groups were: Gobiosoma parri, Gobionellus oceanicus and Ctenogobius boleosoma. Gobiosoma parri was also dominant at the Macaé estuary, which also presented higher densities in the coastal stations during the rainy season (March), both the flood as the ebb tide. Gobionellus oceanicus and Ctenogobius boleosoma were characteristic of the dry season in the mouth and river stations during the flood tide. The abiotic factors chlorophyll-a and temperature were considered biologically significant for Gobiidae larvae distribution. The spatial and seasonal variations together with the tide influence the distribution of the fish larvae Gobiidae family in the Macaé River estuary and its coastal zone.

DIVERSITY OF FISH LARVAE AROUND THE ESTUARY OF THE BANYUASIN RIVER, SOUTH SUMATERA PROVINCE

2020 ◽  
Vol 6 (2) ◽  
Author(s):  
Moh. Rasyid Ridho ◽  
Enggar Patriono ◽  
Sarno Sarno ◽  
Sahira Wirda
Keyword(s):  
Initial Phase ◽  
Sampling Method ◽  
Environmental Changes ◽  
Negative Impact ◽  
Fish Larvae ◽  
River Estuary ◽  
Sampling Technique ◽  
Critical Phase ◽  
Morisita Index ◽  
Index Value

The initial phase of the fish life cycle is a critical phase associated with high mortality due to sensitivity to predators, food availability, and also environmental changes that occur in nature. Disruption of the initial stages of fish life has a negative impact on fish populations. Until now there has been no information about fish larvae around the Banyuasin River Estuary. Therefore, research is needed on the diversity of fish larvae around the Banyuasin River Estuary, South Sumatra Province. This research were used purposive sampling method, sampling technique in the form of Cruise Track Design with continuous parallel survey trajectory. Based on the results of the study found as many as 10 families consisting of 1483 individuals of fish larvae in March and 1013 individuals of fish larvae in May consisting of Engraulidae 1,601 individuals of fish larvae, Mungiloidei as many as 109 individuals, Leiognathidae 50 individuals, Chanidae 453 individuals, Scatophagidae 20 individuals , Belonidae 39 individuals, Gobioididae 5 individuals, Chandidae 183 individuals, Syngnatihidae 6 individuals, and Gobiidae 30 individuals fish larvae. The index value of fish larvae diversity is classified as medium category (March 1.02 and May 1.12), Morisita index shows the distribution pattern of fish larvae classified as a group (March 0-14.17 and May 2.43-10.40 ), and the evenness index value is in the medium category (March 0.437 and May 0.521).

scholarly journals Salinity and freshwater discharge determine rotifer distribution at the Mossoró River Estuary (Semiarid Region of Brazil)

2010 ◽  
Vol 70 (3) ◽  
pp. 551-557 ◽  
Author(s):  
AMA. Medeiros ◽  
JEL. Barbosa ◽  
PR. Medeiros ◽  
RM. Rocha ◽  
LF. Silva
Keyword(s):  
Species Richness ◽  
Rainy Season ◽  
Salinity Gradient ◽  
River Estuary ◽  
Positive Influence ◽  
Freshwater Discharge ◽  
The Other ◽  
Semiarid Region ◽  
Inverse Estuary ◽  
Species Richness And Abundance

The present study aimed at evaluating differences in rotifer distribution in three estuarine zones in an inverse estuary located in the Semiarid Region of Brazil. Zones were chosen based on their proximity to the ocean and river border as a means of reflecting a horizontal salinity gradient. High freshwater discharge during the rainy season was the major determinant of rotifer composition. On the other hand, due to higher salinity values during the dry season, very low values of species richness and abundance were observed in all zones. Therefore, the study highlights the constraints of salinity and the positive influence of seasonality and river proximity on rotifer species in a semiarid estuarine environment.

scholarly journals Fish larvae as food item of planktonic predator (Chaetognatha)

2018 ◽  
Vol 3 (3) ◽  
pp. 94-96
Author(s):  
I. V. Vdodovich ◽  
P. S. Podrezova ◽  
T. N. Klimova
Keyword(s):  
Black Sea ◽  
Significant Role ◽  
Food Item ◽  
Fish Larvae ◽  
High Abundance ◽  
The Black Sea ◽  
Larvae And Juveniles ◽  
Food Competitor ◽  
First Time ◽  
Active Predator

Photos of predation of sagitta (Chaetognatha) to fish larvae are presented for the first time for the Black Sea. While analyzing ichthyoplankton samples obtained in May and November in 2017 (94ᵗʰ and 98ᵗʰ cruises of RV “Professor Vodyanitsky”) several sagittas were found with their guts containing fish larvae. Fish larvae seem to have been captured by sagittas in the same way as sagittas in cannibalism cases, with both folding in half at the spot of capture. The data obtained allow us to assume sagittas in conditions of high abundance of eggs and fish larvae in the plankton to be not only a food competitor of larvae and juveniles of fish, as a fodder plankton consumer, but an active predator, being able to play a significant role in the elimination of ichthyoplankton.

Preliminary Observations on Development of Pacific Bluefin Tuna Thunnus thynnus (Scombridae) Larvae Reared in the Laboratory, with Special Reference to the Digestive System

1996 ◽  
Vol 47 (2) ◽  
pp. 261 ◽  
Author(s):  
T Kaji ◽  
M Tanaka ◽  
Y Takahashi ◽  
M Oka ◽  
N Ishibashi
Keyword(s):  
Digestive System ◽  
Fish Larvae ◽  
Gastric Gland ◽  
Bluefin Tuna ◽  
Juvenile Stage ◽  
Growth Potential ◽  
Morphological Development ◽  
Pacific Bluefin Tuna ◽  
Thunnus Thynnus ◽  
Pyloric Caeca

Pacific bluefin tuna larvae (Thunnus thynnus) were experimentally reared from 2-day-old yolk-sac larvae through 30-day-old early juveniles in June and July 1994. The larvae initially fed on rotifers on Day 3 and Artemia nauplii, fish eggs and larvae around Day 13, and thereafter were fed Artemia larvae and an artificial diet. The larvae had transformed to the juvenile stage after 30 days. The primitive digestive system differentiated on Day 3. The gastric gland and pyloric caeca first appeared on Day 11 and 14, respectively. The pharyngeal and jaw teeth became fully functional with gastric gland differentiation. The number of gastric glands and pyloric caeca and volume of the gastric blind sac increased markedly with development to the juvenile stage. Although the external morphological development of the tuna resembles the pattern of many other marine fish larvae, the basic digestive system developed at an earlier larval stage; this precocity may relate to the early appearance of piscivory and the high growth potential of tuna larvae.

Optical metamorphosis of the eye of Salamandra salamandra

1980 ◽  
Vol 58 (11) ◽  
pp. 2059-2064 ◽  
Author(s):  
J. G. Sivak ◽  
M. R. Warburg
Keyword(s):  
Refractive Error ◽  
Relative Position ◽  
Juvenile Stage ◽  
Corneal Curvature ◽  
Refractive State ◽  
Larvae And Juveniles ◽  
Ocular Structure ◽  
Close Proximity ◽  
Salamandra Salamandra

Ocular structure before, after, and during metamorphosis of Salamandra salamandra was monitored by means of a freeze-sectioning technique. Attention was directed toward the shape and relative position of the lens, corneal curvature, and the angle formed by the geometrical axes of the two eyes. The larval eye is aquatic in form; i.e. the lens is spherical and in close proximity to the relatively flat cornea. In stages during metamorphosis the lens assumes a flattened shape, corneal curvature becomes more pronounced, and the lens moves relatively closer to the retina. The angle between the two eyes decreases as well. Furthermore, these changes continue through the juvenile stage into the adult. Retinoscopic measurements of refractive state indicate that both the larvae and juveniles are more or less free of refractive error in water and air, respectively.

Inter-annual variation of pelagic fish eggs, larvae and juveniles assembles in summer in the Yangtze River Estuary

2015 ◽  
Vol 35 (21) ◽  
Author(s):  
刘守海 LIU Shouhai ◽  
王金辉 WANG Jinhui ◽  
刘材材 LIU Caicai ◽  
秦玉涛 QIN Yutao ◽  
刘志国 LIU Zhiguo ◽  
...  
Keyword(s):  
Yangtze River ◽  
Annual Variation ◽  
River Estuary ◽  
Pelagic Fish ◽  
Yangtze River Estuary ◽  
The Yangtze River ◽  
Fish Eggs ◽  
Larvae And Juveniles ◽  
The Yangtze River Estuary
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