Abundance, Diet and predators of juvenile banana prawns, Penaeus merguiensis, in a tropical mangrove estuary

1988 ◽  
Vol 39 (4) ◽  
pp. 467 ◽  
Author(s):  
AI Robertson
Keyword(s):  
High Tide ◽  
Animal Tissue ◽  
Important Food ◽  
Lates Calcarifer ◽  
Harpacticoid Copepods ◽  
Size Groups ◽  
The Mean ◽  
De Man ◽  
Penaeus Merguiensis ◽  
Important Food Item

Sampling of Penaeus merguiensis de Man with a variety of nets in several microhabitats of a small mangrove-lined estuary near Townsville on seven occasions during 1985 and 1986 captured only one adult prawn. Juveniles of 1-21 mm carapace length (CL) entered the mangrove forest at high tide throughout the year in concentrations up to 0.45 m-3. The mean density of juveniles (3-23 mm CL) in small creeks, which drain into the mainstream of the estuary, was highest in April (41 m-2) and lowest in August (0.3 m-2). The diet of prawns varied with size and microhabitat within the estuary. In creeks, flocculent detrital material (FD) composed of organic aggregates, but without recognizable mangrove detritus, was the most important food item for three size groups of prawns. However, the importance of FD decreased with prawn size as did the proportions of small prey such as diatoms, ostracods and harpacticoid copepods in the diet. The importance of recognizable mangrove detritus increased with prawn size, but never made up more than 15% of the volume of the diet. Insects, mainly dipteran larvae and ants, were 15% of the dietary volume of medium sized prawns (11-15 mm CL) in creeks. On shallow banks on the edge of the maintstream of the estuary, prawns consumed more animal tissue than detritus, and polychaetes and fragments of large crustaceans were important items in the diet. Seven of the 122 species of fish captured in the estuary consumed P. merguiensis. Young barramundi, Lates calcarifer (Bloch), (30-50 cm total length) were the most important predators on juvenile P. merguiensis, with prawns making up 22% by volume of their diets. The possible causes of the link between juvenile P. merguiensis and mangroves are discussed.

scholarly journals SEBARAN FREKUENSI PANJANG, HUBUNGAN PANJANG-BERAT, TINGKAT KEMATANGAN GONAD DAN RATA-RATA UKURAN PERTAMA KALI MATANG GONAD UDANG PUTIH (Penaeus merguiensis De Man, 1888) DI PERAIRAN KOTABARU, KALIMANTAN SELATAN

2018 ◽  
Vol 9 (3) ◽  
pp. 145
Author(s):  
Tirtadanu Tirtadanu ◽  
Suprapto Suprapto ◽  
Ali Suman
Keyword(s):  
Random Sampling ◽  
Management Strategy ◽  
Landing Site ◽  
Length Frequency ◽  
Fishing Season ◽  
Mean Size ◽  
Biological Aspects ◽  
The Mean ◽  
De Man ◽  
Penaeus Merguiensis

Pengusahaan udang putih (Penaeus merguiensis De Man, 1888) di perairan sekitar Kotabaru memerlukan upaya pengelolaan agar perikanan udang dapat berkelanjutan.Salah satu informasi penting yang diperlukan sebagai dasar dalam pengelolaannya yaitu aspek biologi.Tujuan penelitian adalah mengkaji sebaran frekuensi panjang, hubungan panjang-berat, tingkat kematangan gonad dan rata-rata ukuran pertama kali matang gonad udang putih di perairan sekitar Kotabaru. Pengumpulan data diperoleh dari tempat pendaratan udang di Kotabaru pada bulan Januari – November 2016. Metode pengambilan sampel yang digunakan adalah random sampling. Hasil penelitian menunjukkan ukuran udang putih yang tertangkap cenderung kecil dengan ukuran berkisar antara 14 - 46 mmCL dan rata-rata sebesar 26 ± 3,7 mmCL pada udang jantan dan 28,5 ± 5,3 mmCL pada udang betina. Pola pertumbuhan bersifat allometrik negatif dan telah terjadi penurunan bobot dibandingkan beberapa tahun sebelumnya. Proporsi tertinggi udang matang gonad terjadi pada bulan Maret sehingga diduga merupakan puncak pemijahan udang putih.Ukuran pertama kali tertangkap udang (Lc = 28,1 mmCL) lebih kecil dibandingkan ukuran pertama kali matang gonad (Lm = 35,3 mmCL) sehingga sebagian besar udang yang tertangkap belum melakukan pemijahan. Dalam rangka menjaga keberlanjutan sumberdaya udang putih di Kotabaru, disarankan melakukan penutupan penangkapan di bulan Maret dan penggunaan alat tangkap ramah lingkungan dengan ukuran minimum tertangkap lebih besar dari 35 mmCL atau kurang dari 27 ekor dalam 1 kg.The exploitation of banana prawn (Penaeus merguiensis De Man, 1888) in Kotabaru Waters need management strategy, so the prawn fisheries in Kotabaru waters could be sustainably exploited. The important information needed for its basis management are was biological aspects of banana prawn. The aim of this research were to study about length frequency, length-weight relationship, maturity stages and length at first first mature of banana prawn in Kotabaru Waters. The research was conducted at landing site of prawn in Kotabaru and the samples were collected in January – November 2016. The method used for sampling was random sampling. The results showed that the size of banana prawn tend to become smaller with the size between 14-46 mmCL and the mean size were 26 ± 3,7 mmCL for male and 28,5 ± 5,3 mmCL for female. The growth pattern of banana prawn was allometric negative and the weights decreased from the previous years. The highest proportion of mature prawns was in March, likely suggestes to be the spawning season of banana prawn. Length at first captured of banana prawns (Lc = 28,1 mmCL) was lower than length at first matured (Lm = 35,3 mmCL) so most of prawns captured has not spawn yet. For sustainability of banana prawn resources in Kotabaru Waters, it is suggested to close fishing season in March and minimum legal size should be bigger than 35 mmCL or less than 27 prawns in 1 kg.

scholarly journals The Consumed Natural Diet of Chondrostoma regium (Heckel, 1843) from Tigris River, Salah Al-Deen Province

2011 ◽  
Vol 8 (1) ◽  
pp. 348-356
Author(s):  
Baghdad Science Journal
Keyword(s):  
Green Algae ◽  
Important Food ◽  
Food Category ◽  
Natural Diet ◽  
Fish Size ◽  
Blue Green Algae ◽  
Tigris River ◽  
Size Groups ◽  
Ranking Index ◽  
Volumetric Methods

The foreguts of a total of 515 fish of Chondrostoma regium (Heckel, 1843) (locally: Bala’aot Malloky) were studied. These fish were collected from Tigris River at Salah Al-Deen Province (between Al-Hagag & Yathrib) for 20 months between March and October of the next year. Detritus, plant in origin materials (19.6%, 23.0% & 24.9%); green and blue green algae, mostly Cladophora, Cosmarium and Merismpedia sp. (17.1%, 12.9% & 12.2%) and diatoms, mostly Diatoma, Chanathes, Amphora and Cyulbella sp. (16.9%, 8.8% & 8.2%) were the main food categories taken by these fishes according to occurrence (O%), volumetric methods (V%) and ranking index (R%). Debris (not part of the diet) took 45.3% of the studied fish foreguts by volume. Detritus was also the most important food category (25.9%, 18.2%, 22.9% & 19.8%, by ranking index) at all sampling stations respectively, and taken by different fish size groups (168-200, 201-300 & 301-350mm).The diet overlaps between these fish size groups and that between different sampling stations were ranged between 0.86-1.0, i.e. fish were mainly feeding on the same food organisms.

scholarly journals Morphology of Fresh and Cryopreserved Sperms of Banana Shrimp Penaeus merguiensis (De Man, 1888)

2012 ◽  
Vol 7 (1) ◽  
pp. 54-59 ◽  
Author(s):  
M. Ikhwanuddi ◽  
A.J. Memon ◽  
A.D. Talpur ◽  
M.I. Khan ◽  
M.O. Fariddudin ◽  
...  
Keyword(s):  
De Man ◽  
Penaeus Merguiensis

scholarly journals A study on the abundance of zooplankton of a culture and a non-culture pond of the Rajshahi University campus

1970 ◽  
Vol 27 ◽  
pp. 35-41 ◽  
Author(s):  
Sharmeen Rahman ◽  
M Afzal Hussain
Keyword(s):  
Management Practices ◽  
University Campus ◽  
Total Zooplankton ◽  
Chemical Parameters ◽  
Important Food ◽  
Physico Chemical ◽  
Bicarbonate Alkalinity ◽  
Carbon Dioxide Co2 ◽  
Zooplankton Production ◽  
Important Food Item

Zooplankton constitute important food item of many omnivorous and carnivorous fishes. The study was conducted with an aim to study the zooplankton production including physico-chemical parameters with an emphasis to the existing management practices taken by the operators. The study was carried out in a culture and a non-culture pond of Rajshahi University campus was carried out from September, 2004 to February, 2005. Monthly fluctuations of some physico-chemical parameters were noted. The ponds showed alkaline in nature with moderate bicarbonate alkalinity. Diurnal change of water temperature, free CO2 and dissolved Oxygen were also studied. Four groups of zooplankton were identified, of which copepods (1260 units/l and 973.33 units/l in pond-1 and pond-2 respectively) were most dominant. A total of 9 genera of zooplankton were identified of which Cyclops (68.25% and 60.28% of total copepods) was most abundant in both ponds. Total zooplankton showed positive correlation with pH, carbonate alkalinity (CO3) and bicarbonate alkalinity (HCO3) in both ponds and DO, carbon dioxide (CO2) in pond-1. Present findings indicated that the culture pond showed better result than that of the non-culture pond regarding zooplankton production. Key words: Zooplankton, culture pond, non-culture pond, physico-chemical parameters.   doi:10.3329/ujzru.v27i0.1951 Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 35-41

Feeding behaviour of the yellow-bellied glider (Petaurus australis) at the western edge of its range

1999 ◽  
Vol 26 (2) ◽  
pp. 199 ◽  
Author(s):  
Susan M. Carthew ◽  
Ross L. Goldingay ◽  
Darryl L. Funnell
Keyword(s):  
Sap Flow ◽  
Feeding Behaviour ◽  
Food Item ◽  
Food Resource ◽  
Geographic Range ◽  
Important Food ◽  
Ecological Requirements ◽  
South West ◽  
Petaurus Australis ◽  
Important Food Item

This study provides the first assessment of the diet of the yellow-bellied glider (Petaurus australis) in the south-west portion of its range near the Victorian–South Australian border. Examining its diet in this region is viewed as being fundamental to understanding the ecological requirements of the species. Observations were conducted over a five-year period on gliders from five distinct groups. Sap was the most important food item throughout the year and accounted for 83% of 407 feeding observations. Each group of gliders used up to 21 different trees for sap, but during any sample period only 1–8 trees were used. This represents a vastly different pattern of use of sap trees to that described in any earlier study. Some trees were visited more often than others, and these tended to be heavily scarred, indicating use over many years. Other food types were arthropods and honeydew and, to a lesser extent, nectar. This study also revealed that the yellow- bellied glider is not dependent on a diversity of tree species nor on a winter-flowering species. We provide a review of the diet of the yellow-bellied glider throughout its range. This shows that the yellow-bellied glider is reliant on sap as a food resource but particularly so at both ends of its geographic range. The reason for this is unclear, but there is definitely a need for further study of sap-flow patterns in eucalypts.

Occurrence of Aflatoxins, Fumonisin B1, and Zearalenone in Foods and Feeds in Botswana

1998 ◽  
Vol 61 (12) ◽  
pp. 1670-1673 ◽  
Author(s):  
BUPE A. SIAME ◽  
SISAI F. MPUCHANE ◽  
BERHANU A. GASHE ◽  
JOSEPH ALLOTEY ◽  
GETACHEW TEFFERA
Keyword(s):  
Larval Stage ◽  
Peanut Butter ◽  
Fumonisin B1 ◽  
Important Food ◽  
Food And Feed ◽  
Imbrasia Belina ◽  
The Mean ◽  
Staple Foods ◽  
Mean Concentration

Sorghum and maize form the main dietary staple foods in Botswana. Other products such as peanuts, peanut butter, phane (an edible larval stage of an emperor moth Imbrasia belina Westwood), and pulses (cowpeas and beans) are also widely used as food and for the manufacture of feeds. These important food and feed commodities were analyzed for the presence of aflatoxins, fumonisin B1, and zearalenone. Aflatoxins were detected in 40% of the samples analyzed. The concentration of total aflatoxins ranged from 0.1 to 64 μg/kg. The mean concentration ranged from 0.3 μg/kg in sorghum to 23 μg/kg in peanut butter. Peanut butter samples were the most contaminated (71%). No aflatoxins were detected in maize. Fumonisin B1 was detected in 36% of the samples. Maize samples were the most contaminated (85% of the samples) with the concentration ranging from 20 to 1,270 μg/kg. No fumonisin B1 was detected in peanuts, phane, and beans. Zearalenone was only found in 2.6% of the samples analyzed at 40 μg/kg. Aflatoxins were the most common toxins detected in foods and feeds in Botswana. However, fumonisin B1 was more prevalent in maize than aflatoxins or zearalenone.

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