Tag Archives: growth

Growth and Reproduction of Largemouth Bennini Cyprinion macrostomum in Tigris River, Iraq

Ameer Suood Alwan Hamad*(1) and Nehad Khorsheed Wahab(2)

(1). Department. of Agricultural Research, Ministry of Agriculture, Iraq.

(2). Animal production Department, Faculty of Agriculture, Tikrit University, Iraq.

(*Corresponding author: Ameer Suood Alwan Hamad. E-Mail: ameer.suood@yahoo.com).

Received: 02/07/2019                                Accepted: 27/08/2019

Abstract

Growth and reproduction of largemouth Bennini Cyprinion macrostomum was studied in Tigris river in Tikrit region, Iraq, during September 2013 to June 2014. 459 fish were collected, and the total length ranged between 11.8-24.7 cm and their total weight ranged from 19.9 to 184.58 g. The group of length of 14-16 cm accounted the largest percentage 40.52% of total fishing (1549) in September. The value of b=2.99 means that the growth was isometric. The condition factor ranged between 0.73-2.67 with average of 1.22. Condition factor differed according to sex and length. Sex ratio (male: female) tended to female 1:1.57. The highest gonadosomatic index for female was 7.17 and for male was 2.69 in June and the spawning period extended from May and June until August. The smallest length of a mature male reached 13.1 cm and in a mature female was 19.3 cm.

Key words: Growth, Reproduction, Cyprinion macrostomum, Tigris river, Iraq.

Full paper in Arabic: PDF

The Effect of Biological Control of Two Spotted Spider Mite Tetranychus urticae Koch by Using the Predatory Mite Phytoseiulus Persimilis Athias-Henroit on Growth and Productivity of Some Climbing Beans Cultivars

Riad Tofik Zidan(1) Mohammad Ahmad  Ahmad(2) and Alisar Nadim Shaabow*(1)

(1). Department of Horticulture, Faculty of Agriculture, Tishreen University, Latakia, Syria.

(2). Department of Plant Protection, Faculty of Agriculture, Tishreen University, latakia, Syria.

(*Corresponding author:  Eng. Alisar Shaabow. E-Mail: alisar.nadeem@yahoo.com).

Received: 19/11/2018                                Accepted: 19/12/2018

Abstract

The study was carried out at a greenhouse in latakia center for rearing natural enemies during 2017 and 2018, in order to study the effect of  the biological control of the two spotted spider mites Tetranychus urticae Koch (Acari: Tetranychidae)  by using the predatory mite Phytoseiulus persimilis Athias-Henroit (Acari: Phytoseiidae) on growth and productivity of five cultivars of climbing beans: Kentucky wonder white, Blue lake, Fatima, Purple Queen, and Zilioni Gigant. The results showed that releasing the predatory mite increased leaf area to 10294 cm2 compared with the prey treatment 5983 cm2, the net assimilation rate increased from 0.15 to 0.36 mg/cm2/day, and the productivity increased from 0.27 kg/m2 to 1.25 kg/m2, for both prey and predator treatments respectively. The results also showed that Kentucky Wonder White cultivar had the highest leaf area (9499 cm2) and productivity (1.18 kg/m2) with the existence of the predator.

Key words: Climbing bean, growth, Biological control, Tetranychus urticae Koc, Phytoseiulus persimilis Athias-Henroit.

Full Paper in Arabic: PDF