No abstract

In the present paper we have determined the fatty acid content of some edible insects of Mexico. A comparative analysis of the insect species studied in this research showed that caproic acid was present in a minimal proportion which ranged between 0.01 for Periplaneta americana (nymphs) and 0.06 (g/100 g, dry basis) for Euschistus strenuus. The highest proportion of caprilic acid (0.09) was found in Tenebrio molitor (adults). Atta sp. had the highest amount of capric acid (0.26). Polistes sp. was found to be rich in lauric acid (0.77) and for myristic acid it had the highest content (5.64). Dactylopius sp. and E. strenuus were rich in palmitic acid (14.89). Euschistus taxcoensis had the highest quantity of palmitoleic acid (12.06). Llaveia axin exhibited the highest quantity of stearic acid (22.75). Polistes sp. was found to be rich in oleic acid (38.28). The highest quantity of linoleic acid was observed in T. molitor (larvae) (10.89), and in L. axin the highest content of linolenic acid (7.82) was obtained. A comparison between the species under the present investigation revealed that, in general, the insects are poor in caproic, caprilic, capric, lauric, myristic, palmitoleic and linolenic acids, because the quantities were either minimal or could not be detected at all. They had moderate quantities of stearic, palmitic and linoleic acids and had high quantities of oleic acid. Finally it was concluded that although a particular insect species is unable to fulfil the total fatty acid need for a human, if consumed in combination they could definitely be able to supply a good amount of this highly valued nutrient.

Growth of the ornamental fish industry is being hindered by the scarcity of low cost feed; hence alternative protein supplements should be explored. In this context the present study aims to evaluate whether the grasshopper Oxya fuscovittata could be used as a supplement for fish meal in the diets of Poecillia sphenops, which is one of the most common ornamental fishes worldwide. The present work is divided into three phases: In the first phase proximate composition of the grasshopper is obtained and five diets are prepared where fish meal is gradually replaced by Oxya meal and named as control, D1, D2, D3 and D4. All the diets are formulated on iso-nitrogenous basis where the protein percentage is fixed at 400 g/kg. The second phase deals with feeding trial and in the third phase all the data of the feeding trial are subjected to a linear model. The feeding trial shows that the control, D1 and D2 fed fishes have almost similar results. The linear model proves that the variation in the indices are mainly due to replacement of fish meal by Oxya meal, not due to the variations of rice husk and mustard oil cake that are also used to formulate the diets of the present study. From the results two Oxya supplemented diets, i.e. D1 and D2 are proved to be almost equivalent to the control diet. Hence it is concluded that Oxya meal is able to replace 25% to 50% of fish meal from the diets of P. sphenops.

Acridids could be an alternative nonconventional protein source for livestock industries like poultry farms. For a high acridid biomass production, selection of acridid species along with their suitable food plants is essential. The present experiment was conducted by rearing of two common Indian acridids, Oxya hyla and Spathosternum prasiniferum, to estimate which one could produce higher annual biomass when fed on three food plants, Dactyloctenium aegyptium, Brachiaria mutica and Cynodon dactylon, to determine the most favorable food plant. Fecundity, fertility, nymphal mortality and sex ratio of both acridid species fed with three different plants were estimated for the annual biomass production in terms of number. Annual biomass production in terms of wet weight, dry weight and energy content were also estimated. Among the two acridid species, O. hyla showed higher values for fecundity, fertility and both wet and dry body weight; and lower values for nymphal mortality in all the three food plant fed sets. Among the three food plants, B. mutica was found to be the most suitable for annual biomass production of both acridids. It was concluded that mass rearing of O. hyla fed on B. mutica could yield a high annual biomass in acridid farms.Additional key words: acridid farm; Brachiaria mutica; fecundity; mass rearing; Oxya hyla. ResumenProducción de biomasa anual de dos acrídidos (Orthoptera: Acrididae) como alimento alternativo para aves de corralLos acrídidos podrían ser una fuente de proteínas no convencional alternativa para las granjas de aves de corral. Para una producción masiva de biomasa de acrídidos, es esencial seleccionar las especies adecuadas, junto con las plantas que los alimenten adecuadamente. Se llevó a cabo un experimento para criar dos acrídidos comunes en la India, Oxya hyla y Spathosternum prasiniferum y estimar cuál de ellos puede producir una mayor biomasa anual cuando se alimentan de tres plantas, Dactyloctenium aegyptium, Brachiaria mutica y Cynodon dactylon, determinando cual de ellas es el alimento más favorable. Para la producción anual de biomasa, en términos de número, se estimaron las tasas de fecundidad, fertilidad, mortalidad de ninfas y el sexo de ambas especies de acrídidos alimentados con las tres diferentes plantas. También se estimaron la producción de biomasa anual, en términos de peso húmedo y seco, y el contenido de energía. Entre las dos especies, O. hyla mostró valores más altos de fecundidad, fertilidad y peso corporal, tanto húmedo como seco, y valores más bajos de mortalidad de ninfas para las tres plantas. Entre las tres plantas utilizadas como alimento, B. mutica fue la más adecuada para la producción anual de biomasa para ambos acrídidos. Se concluye que la cría masiva de O. hyla alimentándose de B. mutica puede producir una gran biomasa anual en las granjas de acrídidos.

Amblyceps waikhomi sp. nov. is described from the Nongkon stream which drains into the Noa Dehing River, a tributary of the Brahmaputra River, in Arunachal Pradesh, India. The new species can be distinguished from congeners (except A. torrentis) in having a deeper body depth at anus. It further differs from congeners (except A. mangois and A. serratum) in having fewer vertebrae, from A. mangois in lacking (vs. having) strongly-developed projections on the proximal lepidotrichia of the median caudal-fin rays, and in having a longer, wider, and deeper head; and from A. serratum in having a posteriorly smooth (vs. with 4–5 serrations) pectoral spine, and unequal jaw length (lower jaw longer and weakly-projecting anteriorly vs. equal upper and lower jaws). It additionally differs from A. murraystuarti, A. torrentis, A. apangi, A. laticeps, and A. cerinum in having a deeply forked (vs. emarginate or truncate) caudal fin. This species is the seventh amblycipitid species known to occur in the Ganga-Brahmaputra River system.