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Journal : Jurnal Biologi Tropis

Spawning activity of Oryzias woworae Parenti & Hadiaty 2010 with the Suplementation Spirulina Meal in the Diet Mas Bayu Syamsunarno; Mustahal; Achmad Noer Faqih; Achmad Noerkhaerin Putra; Muh. Herjayanto
Jurnal Biologi Tropis Vol. 22 No. 3 (2022): July - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i3.3777

Abstract

Spirulina platensis is a feed additive that can improve the reproductive performance of fish. It has never been given to the endemic fish Oryzias woworae which can lay eggs every day. Therefore, a study was conducted that aims to examine spawning activities related to egg-laying behavior, number of eggs, and egg diameter of O. woworae. The study used a sex ratio of 1♂:1♀ in spawning. The test feeds were commercial feed (Feng Li 1) or 0% without spirulina (treatment A), the addition of spirulina 5% (treatment B), 10% (treatment C), and 20% (treatment D). Observations were made every hour for 6 days. The spawning temperature was controlled at a value of 26.6±0.2°C. The results showed differences in the behavior of O. woworae in releasing eggs on spawning days. Giving spirulina causes the behavior of releasing eggs to occur at intervals of 1-3 hours, while without spirulina, it only occurs 1 hour on spawning days. The highest number of eggs was produced by giving spirulina 20% with a diameter range of 1.35-1.37 mm. The presence of a small egg diameter in the 20% spirulina treatment indicated that an increase in the number of eggs affected the ovaries capacity, so the diameter decreased. However, the average diameter of 20% of spirulina eggs was still the same as without spirulina administration. The stable temperature at 26.6±0.2°C caused the spawning activity of O. woworae to only occur in the morning between 07:00-09:00.
Evaluation of Different Transition Periods in Feeding Live Feed for Tiger Shovelnose Catfish (Pseudoplatystoma punctifer, Castelnau 1855) Larvae Demas Agatri; Achmad Noerkhaerin Putra; Mustahal
Jurnal Biologi Tropis Vol. 23 No. 1 (2023): January - March
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v23i1.4592

Abstract

The production of tiger shovelnose catfish (TSN) is limited by the very low growth during feeding transition in phase larvae. This research aims to evaluate the difference in feed transition period   from nauplii Artemia sp. to Tubifex sp. on the growth and activity of digestive enzymes of TSN larvae. TSN larvae 1 dph (day post hatching) with total length of 4.05±0.16 mm and weight of 4.18±0.67 mg were used in this study. Nine aquariums with 10 L of water were stocked with larvae at a density 30 larvae/L. This study consisted of three treatments of different feed transition time in triplicates i.e. transition at 9 dph (P1), 10 dph (P2) and 11 dph (P3). The result showed that the transitional on 11 dph (P3) recorded the highest total length (36.9±0.56 mm), total weight (242.5±2.4 mg), daily length growth rate (13.43±0.81 %.mm/day), daily weight growth rate (25.4±0.06 %.mg/day), survival rate (81.7±3.1%), and protease enzyme activity (0.222±0.019 IU/mL) compared to 10 dph (P2) and 9 dph (P1). The transition period of 11 days is the mostappropriate time to change the feed for nauplii Artemia sp. to Tubifex sp. in TSN larvae because it produces the best growth and digestive enzyme activity values.
Dietary Spirulina platensis to Increase Color Brightness and Growth of Betta Fish, Betta splendens Alhan Ferdyawan Saputra; Achmad Noerkhaerin Putra; Mas Bayu Syamsunarno
Jurnal Biologi Tropis Vol. 23 No. 4 (2023): October - December
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v23i4.5654

Abstract

Betta fish (Betta splendens) are ornamental fish that have a unique color and high economic value. The aim of this research was to evaluate the addition of different doses of S. platensis in feed on color brightness and growth of betta fish. Betta fish (length of 32±4.4 mm) were maintained in containers with a volume of 4 liters at a density of 1 fish/container for 35 days and feeding is done twice a day at satiation. This research consisted of 4 treatments adding different doses of S. platensis in the feed and 5 repetitions, namely: P1: adding S. platensis 0%, P2: adding S. platensis 1%, P3: adding S. platensis 1.5%, and P4: addition of S. platensis 2%. The research results showed that the carotenoids contained in S. platensis are 737.16 ppm/50 g. The addition of S. platensis in feed can improve the color quality of betta fish but does not affect the growth of betta fish. The addition of 1.5% S. platensis in the feed produced the highest values in the parameters of color brightness (9.1 in the 4th week), color diversity (body 62.54%, base of tail 59.52% and tail 61 .22%), and chromatophore cell area (673000 µm2).