Influence of garlic extract on larval performance and survival of juvenile angelfish Pterophyllum scalare during transport

The objective of this study was to evaluate the properties of garlic as a growth promoter in larvae of angelfish Pterophyllum scalare and its benefits during transport of juveniles of this species. The experiment was conducted in recirculation aquaculture system, consisting of 20 tanks of 40 L equipped with independent water input and output. We used 1,400 larvae distributed among five treatments, with four repetitions, which totaled 20 experimental units. The treatments were 0, 50, 100, 200, and 400 mg of garlic extract per kilo of feed. The results showed that the inclusion of levels of garlic extract in the feed did not significantly effect the fish’s development or their transport. Neither did the inclusion of levels of garlic extract affect the survival of the larvae during the trial period. New research with extracts of higher dosages should be performed to elucidate the effect of garlic extract as a growth promoter.

New bacilli-based probiotic for aquaculture: efficacy study on Macrobrachium rosenbergii

The data on the study of the effectiveness of a new probiotic based on strains B. toyonensis B-13249 and B. pumilus B-13250 when growing shrimps are presented. The experiments were carried out on a private farm in Kazakhstan. The control group of shrimps, which did not receive the probiotic, completed the molting process on the 28th day of the experiment, and the experimental group – 10 days earlier. It was also found that the probiotic has a positive effect on the hydrochemistry of water in recirculating aquaculture system (RAS). The concentration of ammonium (NH3/NH4 +), nitrite (NO2) and nitrate (NO3-) nitrogen in the experimental group did not reach the limit value, in contrast to the control. Based on the obtained results, this probiotic can be recommended for greening aquaculture. The dosage of the probiotic when applied with brine shrimp as feed for shrimp is 1 g/100 g of dry cysts. The dosage of the probiotic when the RAS is added to the water is 5 g/600 l of circulating water once a week.

Biological control of invasive zebra mussel (Dreissen polymorpha) in a freshwater ecosystem through Potamon ibericum

In the present study, possible effects of using Potamon ibericum for the prevention of zebra mussel (Dreissena polymorpha) invasion in a freshwater ecosystem were investigated. In a recirculating aquaculture system (RAS) supplied with aerated freshwater, 3 individuals of P. ibericum were placed in each of 3 aquariums provided by 100 zebra mussels. Throughout the 90-day monitoring study, mussel consumption was visually counted and then new mussels were introduced daily to complete the number of mussels to hundred, repeatedly each day. Throughout the monitoring study, growth rates, number of mussels consumed, and the number of broken mussel shell pieces were determined. Daily consumption rate of mussels by each crab was recorded as 11.115, 11.104, and 11.107 mussel/crab in the 3 experimental groups, respectively. The consumption rate of mussels per crab was counted as 999.78 over the 90-days experiment. As a result, the findings of this study provide strong evidence that P. ibericum can be used for

Pemanfaatan Sistem Embung Sebagai Sumber Air dan Pangan Keluarga di Desa Cikalong Tasikmalaya Jawa Barat

<p><strong><em>Utilizing the Pond as A Water and Food Source in Cikalong Village Tasikmalaya </em></strong><strong><em>West Java.</em></strong> Cikalong Village is administratively in the Tasikmalaya Regency, West Java, often experiencing drought every year, chiefly in the dry season, when the local people have difficulty obtaining water to meet their daily needs. The method used in the activity was a direct observation, interviews, and FGD (Focus Group Discussion). The number of people involved is 10-15 people, in which there are community leaders and farmers. This activity aims to determine the contribution and benefits of the pond, especially in the dry season which is prone to drought. Ponds can be an alternative solution, apart from being a water source, their function can also be developed for fish cultivation with an aquaculture system and vegetables with an aqua-plants system. Both systems are able to meet food needs on a family scale well, with the integration of various types of fish such as <em>Cyprinus carpio</em>, <em>Oreochromis mossambicus</em> and vegetables such as chili, leeks, tomatoes. The results of the activity showed that the benefits of making ponds around the house with sizes of 10x10 m, 5x5 m, and 3x3 m and in gardens with sizes 10x20 m to 20x20 are as water storage, fish cultivation and plant cultivation. The pond was a form of adaptation and mitigation of local communities in responding to the effects of drought properly. The Cikalong Village community can be categorized as a community that has a fairly high sensitivity to the surrounding environmental conditions in recognizing and mitigating drought problems.</p>

Breeding of a Wild Population of South Pacific Bonito Sarda chiliensis chiliensis (Cuvier 1832) Broodstock under Laboratory Conditions in Pisagua, Northern Chile

The wild population of South Pacific bonito Sarda chiliensis chiliensis, which has a wide distribution in northern Chile, is considered of importance in Chilean aquaculture. The biological feasibility of cultivation of any marine species begins with the establishment of an initial broodstock population to obtain eggs, larvae, and juveniles. In this work, 22 South Pacific bonito fishing campaigns were carried out in Pisagua, Chile, between spring in November 2011 and the summer in January 2012. At least 74 specimens were obtained of which 24 survived the capture and transport processes. Fish were stocked in a recirculating land-based aquaculture system, and at 14 months under captivity, fish began spawning. Eggs were collected, to describe some stages of development, and were placed in incubators at 20 °C and on the third-day eggs hatched. Larvae reached a total length between 1.435 and 1.7 mm, which were accurately characterized during their first morphological changes. This is the first work that describes the capture, transport, and acclimatization in captivity of a breeding population of wild Pacific bonito in Chile.