scholarly journals Essais de mise au point de formules alimentaires à base d’azolla (Azolla microphylla kaulf) et de sous-produits locaux pour la pisciculture rurale du tilapia Oreochromis niloticus L.

2009 ◽  
Vol 3 (2) ◽  
Author(s):  
ED Fiogbe ◽  
B Akitikpa ◽  
J-M. M Accodji
Keyword(s):  
Oreochromis Niloticus ◽  
Azolla Microphylla

scholarly journals PENGARUH PEMBERIAN PAKAN AZOLLA MICROPHYLLA TERHADAP PERTUMBUHAN IKAN NILA (OREOCHROMIS NILOTICUS) SEBAGAI RANCANGAN PEMBELAJARAN BIOLOGI SMA

Biogenesis ◽  
2021 ◽  
Vol 17 (1) ◽  
pp. 39
Author(s):  
Suwondo Suwondo ◽  
Darmadi Darmadi ◽  
Muhammad Amin
Keyword(s):  
Growth Rate ◽  
Oreochromis Niloticus ◽  
Material Design ◽  
Control Fish ◽  
Absolute Weight ◽  
Module Design ◽  
Azolla Microphylla ◽  
Length Growth ◽  
Absolute Length ◽  
Quantitative Descriptive

This study aims to determine the growth of tilapia (Oreochromis niloticus) with the use of Azolla microphylla feed and its potential to produce a module design on the material for growth and development of living things in class XII odd semester KD 3.10 and KD 4.10.This research was conducted from May to August 2020 at Danau Selais LPPM Riau University. This study used 2 stages, namely. Phase I research used quantitative descriptive to determine the growth of tilapia on Azolla microphyla feed with different feeding percentages. Fish were grouped into 3 treatments and 1 control. Fish are reared in different cages with different percentage of feeding. The research parameters included absolute length growth, absolute weight growth, nisbi  growth rate, and survival rate.Phase II research is a module teaching material design that uses 2 stages, namely, the Analyze and Design stages.The results of the experimental stage of research, feeding Azolla microphylla affected the growth of tilapia (Oreochromis niloticus). P3 treatment (giving 5% Azolla microphylla from fish biomass) is the best dose in increasing the growth of tilapia. Resulted in the absolute length growth of 4.24 cm, absolute weight 11.72 g, 4.68% relative growth, 4,68% specific growth rate and 99.4% survival rate. The P3 treatment resulted in a growth which was much lower than the P0 treatment (control).

scholarly journals Biomass production of Azolla microphylla as biofilter in a recirculating aquaculture system

2018 ◽  
Vol 2 (01) ◽  
pp. 14-19
Author(s):  
SUMOHARJO SUMOHARJO ◽  
MOHAMMAD MA’RUF ◽  
IRWAN BUDIARTO
Keyword(s):  
Growth Rate ◽  
Water Flow ◽  
Biomass Production ◽  
Oreochromis Niloticus ◽  
Recirculating Aquaculture System ◽  
Azolla Microphylla ◽  
Alternative Feed ◽  
Recirculating Aquaculture ◽  
Aquaculture System ◽  
Set Up

Sumoharjo, Ma’ruf M, Budiarto I. 2018.Biomass production of Azolla microphylla as biofilter in a recirculating aquaculture system. Asian J Agric 2: 14-19. This study utilized macrophyte (Azolla microphylla Kaulf.) as biofilter and perhaps that biomass produced in aquaculture system can be potential for alternative feed. This experiment such a first step of that vision and was aimed to determine the Azolla microphylla growth rate and its efficiency in removing ammonia from a simple recirculating aquaculture system. The experimental units were set up in three different water flow, i.e. 3 lpm, 5 lpm, and 7 lpm onto the three different geometrically baseboard of Tilapia (Oreochromis niloticus) growing tanks (prism, rectangular and limas).The result showed that water flow did not give significant effect(P < 0.10) on the growth rate of Azolla.The lower water flow (3 lpm) resulted in the highest amonia biofiltration efficiency which can remove ammonia up to 32.2±3.0% of the total NH3-N and NH4+-N (TAN).

Ultrastructure of Testicular Spermatozoon of the Fish Oreochromis Niloticus

1988 ◽  
Vol 46 ◽  
pp. 278-279
Author(s):  
T. Guha ◽  
A. Q. Siddiqui ◽  
P. F. Prentis
Keyword(s):  
Electron Microscope ◽  
Oreochromis Niloticus ◽  
Osmium Tetroxide ◽  
Sperm Cells ◽  
Adult Fish ◽  
Testicular Sperm ◽  
Thin Sections ◽  
Important Fish ◽  
Testicular Spermatozoon ◽  
Diamond Knife

Tilapia, Oreochromis niloticus, is an economically important fish in Saudi Arabia. Elucidation of reproductive biology of this species is necessary for successful breeding program. In this paper we describe fine structure of testicular sperm cells in O, niloticus.Testes from young adult fish were fixed in gluteraldehyde (2%) and osmium tetroxide (1%), both in cacodyl ate buffer. Specimens were processed in the conventional way for electron microscopy and thin sections of tissues (obtained by cutting the blocks with a diamond knife) were stained by ura- nyl acetate and lead citrate. These were examined in a Carl Zeiss electron microscope operated at 40 kV to 60 kV. Sperm cells were obtained from testes by squeezing them in cacodyl ate buffer. They were fixed in gluteraldehyde (2%) in the same buffer, air dried, gold coated and then examined in a Philips scanning electron microscope (SEM) operated at 25kV.The spermatozoon of O. niloticus is consisting of head, midpiece and tail (Fig. 1).

Ultrastructure of primary spermatocyte in fish (Tilapia: Oreochromis niloticus): The synaptonemal complex

1986 ◽  
Vol 44 ◽  
pp. 288-289
Author(s):  
T. Guha ◽  
A. Q. Siddiqui ◽  
P. F. Prentis
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Synaptonemal Complex ◽  
Oreochromis Niloticus ◽  
Short Communication ◽  
Primary Spermatocyte ◽  
Mitotic Division ◽  
Meiotic Cell ◽  
Electron Microscope Level ◽  
Homologous Chromosomes

The Primary Spermatocytes represent a stage in spermatogenesis when the first meiotic cell division occurs. They are derived from Spermatogonium or Stem cell through mitotic division. At the zygotene phase of meiotic prophase the Synaptonemal complex appears in these cells in the space between the paired homologous chromosomes. Spermatogenesis and sperm structure in fish have been studied at the electron microscope level in a few species? However, no work has yet been reported on ultrastructure of tilapia, O. niloticus, spermatozoa and spermatogenetic process. In this short communication we are reporting the Ultrastructure of Primary Spermatocytes in tilapia, O. niloticus, and the fine structure of synaptonemal complexes seen in the spermatocyte nuclei.

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