scholarly journals TINGKAT KEMATANGAN GONAD IKAN KERLING JANTAN, Tor tambroides, (Cyprinidae) YANG TERTANGKAP DI DAERAH ALIRAN SUNGAI JAMBAK KABUPATEN ACEH BARAT: PENDEKATAN HISTOLOGI

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
Afrizal Hendri ◽  
Baihaqi Baihaqi
Keyword(s):  
Fresh Water ◽  
Mesh Size ◽  
Sampling Strategy ◽  
Male Fish ◽  
River Habitat ◽  
Result Show ◽  
Aceh Province ◽  
Spermatogonia Cell ◽  
Somatic Index ◽  
Water Species

The study about gonado somatic level of fresh water is database for controlling breeding and conservation in the future. Some asessment can conducted to observing gonado somatic index is with plasma levels (hormone), gonado somatic index dan histology. Tor tambroides (local name is kerling) is one of fresh water species in Aceh. However, exploitation of fish (Tor tambroides) and degradation of river habitat is endanger for this species. This study aims to knowing profile gonado somatic of Tor tambroides especially male fish with histolgy approach. Sampling of fish was conducted during 6 months i.e. July – December. For fish catching, this research was using cast net with mesh size 1 inch and 2 inch. Explorative survey was used for sampling strategy. Histology analysis was conducted at histology laboratorium (Balai Budidaya Air Payau Ujong Batee, Aceh Province). Result show that development fish gonado of Tor tambroides stated with spermatogonia cell, spermatosit primer, spermatosit secondary dan spermatid dan this result is found in every months. Nevertheless, dominant propostion value is spematogenesis with value 55%. Base on the research is known Tor tambroides (male fish) entering spawning session on July.

Biomarker Responses by Crucian Carp (Carassius Carassius) Living in a Pond of Secondary Treated Pulp Mill Effluent

1999 ◽  
Vol 40 (11-12) ◽  
pp. 123-130 ◽  
Author(s):  
J. V. K. Kukkonen ◽  
E. Punta ◽  
P. Koponen ◽  
J. Paranko ◽  
H. Leppänen ◽  
...  
Keyword(s):  
Crucian Carp ◽  
Pulp Mill ◽  
Resin Acids ◽  
Plasma Testosterone ◽  
Pulp Mill Effluent ◽  
Carassius Carassius ◽  
Male Fish ◽  
Organic Chlorine ◽  
Somatic Index ◽  
Crucian Carp Carassius Carassius

Biochemical and histological biomarkers by the adult crucian carp (Carassius carassius (L.)) living in a biologically treated pulp mill effluent were studied. Enocell pulp mill in Uimaharju, Finland, discharges its effluents through a waste water pond to the River Pielisjoki. This pond harbours an introduced crucian carp population that apparently reproduces on site. The objective of the present study was to measure possible hormonal effects of treated pulp mill effluent on crucian carps living in a wastewater pond. Adult fish were collected for analysis by traps. A reference population was sampled from a small natural pond. Blood and bile samples were taken for analyses of hemoglobin, hematocrit, testosterone, triiodothyronine (T3), thyroxine (T4), vitellogenin, organic chlorine compounds, resin acids and neutral wood-based compounds. In addition, a histological analysis of male gonads was made. The exposed fish had higher concentration of organic chlorine compounds, resin acids and β-sitosterol in bile compared to the reference fish. The same compounds could also be found in sediment of the wastewater pond. The exposed male fish had higher liver somatic index (LSI), lower gonad somatic index (GSI), lower haemoglobin and haemocrit, but higher T3 than in the reference fish. In addition, in an average, increased plasma testosterone concentration and decreased thyroxin (T4) levels were found in the exposed male fish. No vitellogenin production was found in the exposed male fish and some females showed decreased vitellogenin levels. The histological structure of the gonads in the exposed males was normal. The results suggest more anti-estrogenic than estrogenic effects of pulp mill effluents on the crucian carp.

Variations in sex, length and age compositions of commercial catches of Platycephalus fuscus (Pisces : Platycephalidae) in New South Wales, Australia

2002 ◽  
Vol 53 (7) ◽  
pp. 1091 ◽  
Author(s):  
C. A. Gray ◽  
V. J. Gale ◽  
S. L. Stringfellow ◽  
L. P. Raines
Keyword(s):  
Average Length ◽  
New South ◽  
New South Wales ◽  
Total Mortality ◽  
Mesh Size ◽  
Growth Zone ◽  
Male Fish ◽  
Age Composition ◽  
South Wales ◽  
By Catch

Commercial landings of dusky flathead (Platycephalus fuscus) from four estuaries in New South Wales (NSW), Australia, were sampled for data on sex, length and age composition between February and July each year for 2–3 years between 1995 and 1997. Landings primarily contained female fish, ranging from 55% to 93% by number for different estuaries. Flathead sampled in commercial catches ranged from 30 cm to 96 cm total length (TL), but the majority were 33–50 cm TL. Fish >40 cm TL were primarily female and male fish >45 cm TL were uncommon. The length composition of catches differed between gillnets of different mesh sizes, with the average length of fish being least in the smallest allowed mesh size of 70 mm. Fish were aged by otolith interpretation and the analysis of marginal increments indicated that one opaque and one translucent growth zone was formed each year; the opaque zone being deposited in June–August (winter) and first observed in September–October (spring). Commercial landings included fish aged 2–11+ years, but fish aged 2–4+ years dominated landings in all estuaries. The total mortality of dusky flathead in each estuary was estimated by catch curve analysis and was relatively high, ranging from 0.45 to 1.64. The data indicate that dusky flathead may be heavily exploited in NSW.

scholarly journals The Distribution of Gammarus Species in Estuaries. Part I

1947 ◽  
Vol 27 (1) ◽  
pp. 1-52 ◽  
Author(s):  
G. M. Spooner
Keyword(s):  
Fresh Water ◽  
Brackish Water ◽  
Field Work ◽  
Bottom Fauna ◽  
Qualitative Composition ◽  
British Isles ◽  
Free Swimming ◽  
The Status ◽  
Brackish Water Species ◽  
Water Species

The work of which an account is here given was largely carried out from the autumn of 1937 to the spring of 1940, when it was interrupted by the war. In taking it up again (in July 1945) while, facilities for field work are still limited, the author feels it useful to publish results as they stand and indicate where further work is considered advisable.In examinations of the free-swimming bottom fauna of the Tamar and other estuaries, attention was inevitably drawn to the populations of Gammarus species, which make up the greater bulk of it. Before quantitative observations were planned, some interesting points came to light with regard to the qualitative composition of populations. This aspect lent itself more readily to study and, though byno means a new field for exploration, soon proved worth examining ingreater detail than previous workers had attempted.The broad fact of a replacement of one Gammarus species by another in passing up an estuary was well enough known, though exact knowledge for the British Isles only starts from the time when G. zaddachi Sexton was recognized as a regular member of the upper estuarine fauna of the Tay (Bassindale, 1933; Alexander, Southgate & Bassindale, 1935) and of the Deben (Serventy, 1935). This species proved to be the main brackish-water species overlapping with the marine G. locusta (L.) near the seaward end, and with the fresh-water G. pulex (L.) at the river end (or ‘head’) of the estuary. The status in estuaries of two other brackish-water species, G. duebeni Lillj. and G. chevreuxi Sexton, remained obscure.

scholarly journals On the use of antibiotics for isolating bacteria-free cultures of marine phytoplankton organisms

1952 ◽  
Vol 31 (1) ◽  
pp. 97-106 ◽  
Author(s):  
C. P. Spencer
Keyword(s):  
Fresh Water ◽  
Solid Medium ◽  
Classical Method ◽  
Single Cells ◽  
Marine Phytoplankton ◽  
Marine Diatom ◽  
Sterile Medium ◽  
Kinetics Of ◽  
Water Species ◽  
Algal Cultures

In the course of some studies on the kinetics of growth and the biochemical activities of a marine diatom it became desirable to obtain bacteria-free cultures. The classical method of obtaining such pure algal cultures involves either repeatedly washing single cells in sterile medium or obtaining discrete bacteria-free algal colonies by growth on a solid medium. Both these methods have been widely applied to fresh-water species by Pringsheim (1946) and others, whilst Chu (1946) has used both methods with the marine diatom Nitzschia closterium (Ehrenberg) Wm. Smith forma minutissima.

The non-marine mollusca of the interglacial deposits at Bobbitshole, Ipswich

1957 ◽  
Vol 241 (676) ◽  
pp. 33-44 ◽  
Keyword(s):  
Fresh Water ◽  
Relative Abundance ◽  
Climatic Conditions ◽  
Last Interglacial ◽  
Percentage Frequency ◽  
Secondary Maximum ◽  
Tolerant Species ◽  
Water Species

The non-marine Mollusca from the Eemian (Last) Interglacial deposits at Bobbitshole, Ipswich, are analyzed. The fauna is a local one of marsh and fresh-water species and contains very few species which appear to have been washed in from other environments. The more common Mollusca are arranged into groups of climatically tolerant, less tolerant and least tolerant species, and the percentage frequency of both species and groups is analyzed through the deposit. Tolerant species dominate in the lower part of the deposit, while the less and least tolerant groups become successively important higher up. A puzzling secondary maximum of tolerant species near the top of the deposit is discussed. The conclusions about local and climatic conditions reached from the Mollusca agree closely with those derived from the plants. It is concluded that the relative abundance of the different species of Mollusca, rather than the presence or absence of isolated specimens of certain species, is important in deducing the conditions under which they lived.

A NEW WATER-BUG FROM CANADA

1897 ◽  
Vol 29 (3) ◽  
pp. 56-56
Author(s):  
William H. Ashmead
Keyword(s):  
New Species ◽  
Fresh Water ◽  
North American ◽  
South American ◽  
The South ◽  
Water Stream ◽  
The North ◽  
Water Species

The interesting new species of water-bug described below was received some time ago from Abbé P. A. Bégin, of Sherbrooke, Canada. It was captured swimming on a fresh-water stream some little distance above Sherbrooke, and is of more than ordinary interest, from the fact that it belongs to the genus Halobatopsis, Bianchi, a genus not yet recognized in the North American fauna, and only recently characterized, being based upon the South American Halobates platensis, Berg., also a fresh-water species.

2. On New Species of Marine Diatomaceæ from the Firth of Clyde and Loch Fine. Illustrated by numerous drawings, and by enlarged figures, all drawn by Dr Greville.

1857 ◽  
Vol 3 ◽  
pp. 442-451
Author(s):  
Gregory
Keyword(s):  
New Species ◽  
Fresh Water ◽  
Salt Water ◽  
High Tide ◽  
Tidal Estuary ◽  
Water Species

In two papers, read before this Society, and subsequently published in the Microscopical Journal, I described and figured a large number of new species of Diatoms, chiefly marine, which I had found in the Glenshira sand.This sand was deposited by the Dhu Loch of Glenshira, at a period geologically recent, when that lake occupied a higher level than it now does, and extended about two miles farther up the valley. That the Dhu Loch at that period, as well as now, communicated with Loch Fine, so that at high tide the salt water flowed into the lakes, while at low water the current, as in a tidal estuary, flowed outwards, is proved by the fact, that the sand then deposited contains more marine than fresh-water species.

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