415 research outputs found
Pufferfish Lagocephalus inermis - an emerging fishery along Mangalore coast of Karnataka
L agocephalus inermis (Temminck & Schlegel,
1850) commonly known as smooth blaasop,
belongs to the family Tetraodontidae and order
Tetraodontiformes. This fish was considered as a
menace by fishermen during the previous year (2006)
as it caused damage to other species landed and
the net
Gillnet and hook & line fishing off Mangalore
Fishing using gillnets and hooks and line have
been in vogue along Mangalore coast since a
long time. These fishing practices are very
popular and found to be lucrative along
coastal Karnataka. Fishing using gillnets and
hooks and line has so far been operated only
Mar. Fish. Infor. Serv., T&E Ser., No. 188, 2006 6
from canoes fitted with outboard engines
(OBM). The fishermen fish for a day or night
or at the most for 2-3 days. However, of late,
mechanized crafts (inboard mechanized)
operating gillnets as well as hooks and line
land their catch at Mangalore Fisheries
Harbour. The crafts used are large and
comparable to the size of trawlers and
purseseiners of Mangalore and have an
endurance to stay out at sea for more than a
month. As this kind of fishing activity is new
to this area, the catch as well as gear details
were studied and a brief account is given
Targeted trawl fishery for moontail bullseye, Priacanthus hamrur off Mangalore for surumi production
Moontail bullseye, Priacanthus hamrur has been
forming a part of the trawl fishery off Mangalore,
caught from a depth beyond 100 m ever since
deepsea trawling started off the coast. This is not a
preferred edible species in Karnataka and was not a
species considered for targeted fishery
Unusual catch rates of cuttlefish in a multiday trawler
Cuttlefish is one of the commercially important
group of cephalopods caught by multi-night trawlers
along the coast of Karnataka. The catch rate of
cuttlefish in multiday trawlers varies from <5 kg/haul
during December-April period to 50-300 kg/haul
during the peak fishing season in August-
September
Observations on the landing of Odonus niger at Mangalore
The redtoothed triggerfish (Odonus niger) of the
family Balistidae is a reef associated species landed
by trawl nets operated along the Karnataka coast. This
species forms dense aggregations in inshore waters
and were not targeted till recently due to their poor
market demand. The triggerfish shoals are intentionally
avoided by the trawlers and the incidental catches are
either discarded or brought ashore when there is
available deck space for storage. Such small quantities
landed are auctioned along with the miscellaneous
fish groups. Some interest was evinced on this species
by the fish meal traders due to limited availability of
raw materials during the year 2008
High abundance of large sized rock cods (Epinephelus spp.) off Karnataka coast during the postmonsoon month of September
some of the
multi-day units ventured into deeper waters
(60-80 m) and obtained good catches of reef
cods (Fig: 1) along with threadfin breams and
cuttle fishes. Encouraged by this, more number
of multi-day units were put into operation in
September of the following year (1995) and got
still better catches of reef cods
Emerging small scale trap fishery for whelk, (Babylonia spirata) in Malpe, Southern Karnataka
Babylonia spirata is a commercially important
edible gastropod found inhabiting the
coastal waters with sandy bottom. Commonly
known as whelks, they are landed as by-catch
in shrimp trawlers in Kerala and Tamilnadu.There is an emerging fishery for whelks along the Malpe coast (13┬░
21тАЩ N and 74┬░42тАЩ5тАЭ E) with the increase in
export demand. Specially designed whelk traps are operated from traditional fishing crafts to collect whelks since January 2005
Contra Harmonic Mean Labelling of Graphs
A graph labelling is an assignment of integers to the vertices or edges or both subject to certain conditions. A Graph G(V, E) with p vertices and q edges is called a Contra Harmonic mean graph if it is possible to label all the vertices x тИИ V with distinct labels f(x) from {1, 2, 3, 4, тАж., p } in such a way that each edge e = uv is labelled with
f uv = f(u) 2 + f(v) 2
f u +f(v)
or f uv = f(u) 2 + f(v) 2
f u +f(v)
are distinct
Effect of Soil Moisture Stress on Physiological Response in Grape (Vitis vinifera L.) Varieties
Four varieties of grape namely Flame Seedless, Thompson Seedless, Sharad Seedless and Tas-A-Ganesh were subjected to different levels of moisture stress to study their physiological response. Stress was imposed for 14 days by withholding irrigation. Observations on relative water content, leaf water potential, leaf osmotic potential and gas exchange parameters like photosynthetic rate, transpiration rate, stomatal conductance and water use efficiency (WUE) were recorded. None of the varieties could survive for 14 days without irrigation (100% stress). Flame Seedless and Thompson Seedless at 50% moisture stress maintained higher turgidity as indicated by lesser reduction in relative water content and water potential attributed to better osmotic adjustment. Marginal reduction in photosynthesis and greater reduction in transpiration rate in the variety Flame Seedless may have resulted in higher WUE under moisture stress. Higher photosynthetic rate, lower transpiration rate, higher water relation parameters and high WUE in Flame Seedless under soil moisture stress indicated its better tolerance to drought
Food and feeding habits of the narrow barred Spanish mackerel Scomberomorus commerson (Lacepede, 1800) off Karnataka, south-west coast of India
Scomberomorus commerson were collected on weekly basis during January 2012 to December 2014 at Mangalore Fishing Harbour. Stomach of 214 narrow barred Spanish mackerel measuring from 48 to 105 cm fork length (FL) for males and 45.5 to 115 cm FL for females were analysed to study their feeding habits. Fish with empty stomach were prevalent in almost all the months. Prey mainly comprised of fishes and crustaceans, with the fish component forming 99.9%. The index of relative importance (IRI) showed that the dominant prey were semi-digested fish remains (44.6%) of Sardinella longiceps (30.1%), Decapterus sp. (18.7%), whitebaits (2.5%), Rastrelliger kanagurta (1.5%) and Epinephelus spp. (1.1%), while Saurida sp. (0.7%), Megalaspis cordyla (0.5%), Scombroides sp. (0.2%) and shrimps (0.1%) were found occasionally in the gut. Index of stomach fullness (SFI) was 0.11 in August and 0.65 in January. Generally, SFI was higher during September to January and lower during February to August. The empty stomach ratio (ESR) ranged from 33.3% (August) to 92.3% (April)
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